diff --git a/4-seasons.sh b/4-seasons.sh
old mode 100644
new mode 100755
index 3db8251..dea6060
--- a/4-seasons.sh
+++ b/4-seasons.sh
@@ -1,182 +1,104 @@
 #!/bin/bash
+# 4-seasons.sh — create one daily clip from yesterday's images, sized to its
+# share of the corresponding Vivaldi movement's music duration.
+#
+# On the last day of a movement period, automatically runs montage-mvt.sh to
+# compile the full movement montage.
+#
+# Run once per day from cron (e.g. 01:00 daily).
 
+set -euo pipefail
 set -x
 
-# Get yesterday's date
-yesterday=$(date --date="yesterday" +%Y-%m-%d)
-current_year=$(date +%Y)
-day_of_year=$(date --date="$yesterday" +%j)  # Day of the year (1 to 366)
+SCRIPT_DIR="$(dirname "$(realpath "$0")")"
 
-# Define base directory and music directory
+# ── Configuration ──────────────────────────────────────────────────────────────
 base_dir="/home/motion/drives/local-2tb"
-music_base_dir="/home/motion/drives/local-2tb/music/4 Seasons"
+music_base_dir="$base_dir/music/4 Seasons"
+[ ! -d "$music_base_dir" ] && music_base_dir="$SCRIPT_DIR/music"
 
-# Determine the season based on the day of the year
-if [ "$day_of_year" -ge 80 ] && [ "$day_of_year" -le 172 ]; then
-    season="Spring"
-    season_start_date=80
-    season_end_date=172
-    days_in_season=92
-elif [ "$day_of_year" -ge 173 ] && [ "$day_of_year" -le 264 ]; then
-    season="Summer"
-    season_start_date=173
-    season_end_date=264
-    days_in_season=92
-elif [ "$day_of_year" -ge 265 ] && [ "$day_of_year" -le 355 ]; then
-    season="Autumn"
-    season_start_date=265
-    season_end_date=355
-    days_in_season=91
-else
-    season="Winter"
-    season_start_date=356
-    season_end_date=79
-    days_in_season=90
-fi
+# ── Date setup ────────────────────────────────────────────────────────────────
+yesterday=$(date --date="yesterday" +%Y-%m-%d)
+echo "Processing: $yesterday"
 
-# Calculate the day of the season (from 1 to days_in_season)
-if [ "$season" == "Winter" ]; then
-    if [ "$day_of_year" -ge 355 ]; then
-        # Winter season starts at day 1 on Dec 21st
-        day_of_season=$(($day_of_year - 354))  # Day 1 of Winter starts on Dec 21st
-    else
-        # Before Dec 21st, Winter starts on Dec 21st in the previous year
-        day_of_season=$((365 - 354 + $day_of_year))  # Adjust for the 365th day (Dec 20th) in the previous year
-    fi
-else
-    day_of_season=$(($day_of_year - $season_start_date + 1))
-fi
+# ── Season / movement info from astronomical calculation ──────────────────────
+eval "$(python3 "$SCRIPT_DIR/season_info.py" "$yesterday")"
+# Provides: SEASON  MVT_NUM  DAY_OF_MVT  DAYS_IN_MVT  MVT_START  MVT_END  IS_LAST_DAY
+echo "Season=$SEASON  Mvt=$MVT_NUM  Day=$DAY_OF_MVT/$DAYS_IN_MVT  LastDay=$IS_LAST_DAY"
 
-# Determine the movement based on the day of the season
-if [ "$season" == "Winter" ]; then
-    # Winter typically has three movements, so we calculate the movement number
-    if [ "$day_of_season" -le 30 ]; then
-        movement_num=1
-    elif [ "$day_of_season" -le 60 ]; then
-        movement_num=2
-    else
-        movement_num=3
-    fi
-else
-    # Other seasons follow the same calculation for movement
-    if [ "$day_of_season" -le 30 ]; then
-        movement_num=1
-    elif [ "$day_of_season" -le 60 ]; then
-        movement_num=2
-    else
-        movement_num=3
-    fi
-fi
-
-# Determine the music file based on the season and movement
-music_file=$(find "$music_base_dir" -type f -iname "*$season Mvt $movement_num*" | head -n 1)
-
-# Check if the music file exists
-if [ ! -f "$music_file" ]; then
-    echo "Music file for $season, Movement $movement_num not found!"
+# ── Locate music file and get its duration ────────────────────────────────────
+music_file=$(find "$music_base_dir" -type f -iname "*${SEASON}*Mvt*${MVT_NUM}*" | sort | head -n 1)
+if [ -z "$music_file" ] || [ ! -f "$music_file" ]; then
+    echo "ERROR: Music file not found for $SEASON Mvt $MVT_NUM in $music_base_dir"
     exit 1
 fi
+music_duration=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$music_file")
+echo "Music: $(basename "$music_file")  ($music_duration s)"
 
-# Get the duration of the music file in seconds
-music_duration=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$music_file")
-echo "Music duration: $music_duration seconds"  # Printing the music duration for verification
+# Each daily clip covers music_duration / DAYS_IN_MVT seconds so that
+# concatenating all clips for the movement sums to the exact music duration.
+target_per_clip=$(echo "scale=6; $music_duration / $DAYS_IN_MVT" | bc)
+echo "Target clip duration: $target_per_clip s  ($DAYS_IN_MVT days in movement)"
 
-# Define the directory where images are stored (using yesterday's date)
-first_word_of_script_folder=$(basename "$(dirname "$(realpath "$0")")" | cut -d'-' -f1)
-image_dir="$base_dir/$first_word_of_script_folder/$yesterday"
+# ── Locate yesterday's images ─────────────────────────────────────────────────
+script_name=$(basename "$SCRIPT_DIR" | cut -d'-' -f1)
+image_dir="$base_dir/$script_name/$yesterday"
 
-# Check if the image directory exists
 if [ ! -d "$image_dir" ]; then
-    echo "Error: Image directory $image_dir not found for $yesterday!"
-    echo "Skipping this day's video generation."
-    # Log the missing day
-    echo "No images for $yesterday" >> /path/to/missing_days.log
-    # Skip to the next day
+    echo "WARNING: Image directory $image_dir not found — skipping $yesterday."
     exit 0
 fi
 
-# Get today's date in yyyy-mm format for output directory
-output_date=$(date +"%Y-%m")  # yyyy-mm format
+total_images=$(find "$image_dir" -type f -name "*.jpg" | wc -l)
+if [ "$total_images" -lt 1 ]; then
+    echo "WARNING: No images in $image_dir — skipping $yesterday."
+    exit 0
+fi
+echo "Images found: $total_images"
 
-# Dynamically generate the output directory based on season and movement
-output_dir="$base_dir/movies/$first_word_of_script_folder/$season/Mvt$movement_num"
+# ── Prepare output directory ──────────────────────────────────────────────────
+output_dir="$base_dir/movies/$script_name/$SEASON/Mvt$MVT_NUM"
 mkdir -p "$output_dir"
 
-# Count the total number of images (JPEG files)
-total_images=$(find "$image_dir" -type f -name "*.jpg" | wc -l)
+# ── Build sorted image list ───────────────────────────────────────────────────
+temp_file=$(mktemp --suffix=.txt)
+temp_video="$output_dir/${yesterday}_Mvt${MVT_NUM}-temp.mp4"
+cleanup() { rm -f "$temp_file" "$temp_video" 2>/dev/null || true; }
+trap cleanup EXIT
 
-# If there are no images, log it and move to the next day
-if [ "$total_images" -lt 1 ]; then
-    echo "Error: No images found in $image_dir for $yesterday."
-    echo "Skipping this day's video generation."
-    # Log the missing day
-    echo "No images for $yesterday" >> /path/to/missing_days.log
-    # Skip to the next day
-    exit 0
+find "$image_dir" -type f -name "*.jpg" | sort | while read -r img; do
+    echo "file '$img'"
+done > "$temp_file"
+
+# ── Step 1: Build raw video at default frame rate ─────────────────────────────
+echo "Step 1/2: encoding raw video..."
+ffmpeg -loglevel warning \
+    -f concat -safe 0 -i "$temp_file" \
+    -c:v libx264 -pix_fmt yuv420p -crf 28 -vsync 2 -an \
+    -y "$temp_video"
+
+raw_duration=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$temp_video")
+echo "Raw duration: $raw_duration s"
+
+# ── Step 2: Speed-adjust to target clip duration ──────────────────────────────
+speed_factor=$(echo "scale=6; $raw_duration / $target_per_clip" | bc)
+echo "Step 2/2: speed factor $speed_factor..."
+
+final_file="$output_dir/${yesterday}_Mvt${MVT_NUM}-Day${DAY_OF_MVT}of${DAYS_IN_MVT}-final.mp4"
+ffmpeg -loglevel warning \
+    -i "$temp_video" \
+    -vf "setpts=PTS/$speed_factor" \
+    -c:v libx264 -pix_fmt yuv420p -crf 26 \
+    -t "$target_per_clip" -an \
+    -y "$final_file"
+
+adjusted=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$final_file")
+echo "Daily clip: $final_file  ($adjusted s)"
+
+# ── Auto-trigger montage on last day of movement ──────────────────────────────
+if [ "$IS_LAST_DAY" = "true" ]; then
+    echo "Last day of $SEASON Mvt $MVT_NUM — triggering montage compilation..."
+    # Pass $yesterday so montage-mvt.sh looks up the correct movement
+    # (running the next morning, "today" would already be the next movement).
+    "$SCRIPT_DIR/montage-mvt.sh" "$yesterday"
 fi
-
-# Create a temporary text file with the sorted list of image paths
-temp_file=$(mktemp)
-find "$image_dir" -type f -name "*.jpg" | sort -n | while read image; do
-  echo "file '$image'" >> "$temp_file"
-done
-
-# Calculate the number of images
-num_images=$(wc -l < "$temp_file")
-echo "Total images found for the video: $num_images"
-
-# Calculate the target total duration (music duration + 3 seconds for transitions)
-target_total_duration=$(echo "$music_duration + 3" | bc)
-echo "Target total video duration (music + 3 seconds): $target_total_duration seconds"
-
-# Calculate the target duration per video (based on number of days in the season)
-target_duration_per_video=$(echo "$target_total_duration / $days_in_season" | bc -l)
-echo "Each day's target video length: $target_duration_per_video seconds"
-
-# Check if the daily video length is too short (less than 1.67 seconds)
-if (( $(echo "$target_duration_per_video < 1.67" | bc -l) )); then
-    echo "Daily video length is less than 1.67 seconds. Doubling the music duration."
-    music_duration=$(echo "$music_duration * 2" | bc)
-    target_total_duration=$(echo "$music_duration + 3" | bc)
-    target_duration_per_video=$(echo "$target_total_duration / $days_in_season" | bc -l)
-    echo "New target total video duration (after doubling music): $target_total_duration seconds"
-    echo "New target duration per video: $target_duration_per_video seconds"
-fi
-
-# First, create the video using default frame rate (no speed-up or slow-down yet)
-temp_video="$output_dir/${yesterday}_Mvt${movement_num}-temp.mp4"
-echo "Creating video at default frame rate..."
-ffmpeg -f concat -safe 0 -i "$temp_file" -c:v libx264 -pix_fmt yuv420p -crf 28 -vsync 2 -y "$temp_video"
-
-# Check the duration of the created video
-video_duration=$(ffmpeg -i "$temp_video" 2>&1 | grep "Duration" | cut -d ' ' -f 4 | sed s/,//)
-echo "Initial video duration: $video_duration"
-
-# Get the video duration in seconds (from HH:MM:SS format)
-IFS=':' read -r hours minutes seconds <<< $(echo $video_duration | cut -d '.' -f1)  # Extract time
-total_seconds=$(($hours * 3600 + $minutes * 60 + $seconds))  # Convert to total seconds
-
-# Calculate the speed-up factor to make the video fit into the target duration
-speed_up_factor=$(echo "scale=3; $total_seconds / $target_duration_per_video" | bc)
-echo "Calculated speed-up factor: $speed_up_factor"
-
-# Adjust the playback speed using the setpts filter to make the video fit into the target duration
-final_file_name="${yesterday}_Mvt${movement_num}-Day${day_of_season}of${days_in_season}-final.mp4"
-final_video="$output_dir/$final_file_name"
-ffmpeg -i "$temp_video" -filter:v "setpts=PTS/$speed_up_factor" -y "$final_video"
-
-# Check the duration of the adjusted video
-adjusted_duration=$(ffmpeg -i "$final_video" 2>&1 | grep "Duration" | cut -d ' ' -f 4 | sed s/,//)
-echo "Adjusted video duration: $adjusted_duration"
-
-# Check for ffmpeg success
-if [ $? -ne 0 ]; then
-  echo "Error: ffmpeg failed to create the final video."
-  exit 1
-fi
-
-# Inform user the video has been created
-echo "Video created at $final_video"
-
-# Clean up the temporary file
-rm "$temp_file"
diff --git a/fullday-video.sh b/fullday-video.sh
new file mode 100755
index 0000000..955f29f
--- /dev/null
+++ b/fullday-video.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+# fullday-video.sh — create a natural-speed timelapse of yesterday's full day of
+# images at a fixed frame rate.  Files older than RETENTION_DAYS are deleted
+# automatically.  Sunrise 10-second uploads and montage videos are NOT touched.
+#
+# Run once per day from cron (e.g. 02:00 daily, after 4-seasons.sh).
+
+set -euo pipefail
+
+SCRIPT_DIR="$(dirname "$(realpath "$0")")"
+
+# ── Configuration ──────────────────────────────────────────────────────────────
+base_dir="/home/motion/drives/local-2tb"
+FULLDAY_FPS=5       # timelapse frame rate — adjust to taste
+RETENTION_DAYS=10   # full-day videos older than this are deleted
+
+# ── Date / paths ──────────────────────────────────────────────────────────────
+yesterday=$(date --date="yesterday" +%Y-%m-%d)
+script_name=$(basename "$SCRIPT_DIR" | cut -d'-' -f1)
+image_dir="$base_dir/$script_name/$yesterday"
+output_dir="$base_dir/movies/$script_name/fullday"
+mkdir -p "$output_dir"
+
+# ── Purge old full-day videos ─────────────────────────────────────────────────
+echo "Removing full-day videos older than $RETENTION_DAYS days..."
+find "$output_dir" -maxdepth 1 -name "*-fullday.mp4" -mtime "+$RETENTION_DAYS" -delete
+
+# ── Sanity checks ─────────────────────────────────────────────────────────────
+if [ ! -d "$image_dir" ]; then
+    echo "WARNING: Image directory $image_dir not found — skipping."
+    exit 0
+fi
+
+num_images=$(find "$image_dir" -type f -name "*.jpg" | wc -l)
+if [ "$num_images" -lt 1 ]; then
+    echo "WARNING: No images in $image_dir — skipping."
+    exit 0
+fi
+
+frame_dur=$(echo "scale=6; 1 / $FULLDAY_FPS" | bc)
+approx_min=$(echo "scale=1; $num_images / $FULLDAY_FPS / 60" | bc)
+echo "Images: $num_images at ${FULLDAY_FPS} fps  ≈ ${approx_min} min"
+
+# ── Build concat list with per-frame duration ─────────────────────────────────
+# The concat demuxer needs an explicit duration per image; the last file is
+# repeated without a duration to correctly anchor the final frame's pts.
+temp_list=$(mktemp --suffix=.txt)
+trap 'rm -f "$temp_list"' EXIT
+
+find "$image_dir" -type f -name "*.jpg" | sort | while read -r img; do
+    printf "file '%s'\nduration %s\n" "$img" "$frame_dur"
+done > "$temp_list"
+
+# Append last image again (required by ffmpeg concat demuxer for images)
+last_img=$(find "$image_dir" -type f -name "*.jpg" | sort | tail -n 1)
+printf "file '%s'\n" "$last_img" >> "$temp_list"
+
+# ── Encode — native camera resolution, no audio ───────────────────────────────
+output_file="$output_dir/${yesterday}-fullday.mp4"
+echo "Creating: $output_file"
+
+ffmpeg -loglevel warning \
+    -f concat -safe 0 -i "$temp_list" \
+    -c:v libx264 -pix_fmt yuv420p -crf 28 \
+    -an -y "$output_file"
+
+actual_dur=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$output_file")
+echo "Done: $output_file  (${actual_dur}s / $(echo "scale=1; $actual_dur/60" | bc) min)"
diff --git a/montage-mvt.sh b/montage-mvt.sh
old mode 100644
new mode 100755
index 6d6acf3..ebff07c
--- a/montage-mvt.sh
+++ b/montage-mvt.sh
@@ -1,108 +1,159 @@
 #!/bin/bash
+# montage-mvt.sh — compile all daily clips for the current Vivaldi movement into
+# a single montage that exactly matches the music duration, with 2-second
+# audio/video fade in/out and a 7-second attribution card appended.
+#
+# Called automatically by 4-seasons.sh on the last day of each movement.
+# Can also be run manually (e.g. to build a partial mid-season preview).
+#
+# Music: "The Four Seasons" by Antonio Vivaldi
+# Performed by John Harrison with the Wichita State University Chamber Players
+# Source: Free Music Archive — freemusicarchive.org
+# License: CC BY-SA 3.0 — creativecommons.org/licenses/by-sa/3.0
 
-# Set parameters dynamically based on the current date
-current_date=$(date +%Y-%m-%d)
-current_year=$(date +%Y)
-day_of_year=$(date +%j)  # The day of the year (e.g., 1-365)
+set -euo pipefail
 
-# Define season and movement parameters based on the current date
-if [ $day_of_year -ge 265 ] && [ $day_of_year -le 355 ]; then
-    season="Autumn"
-    movement_num=3
-    season_start_date=265
-    season_end_date=355
-    days_in_season=91
-    day_of_season=$((day_of_year - season_start_date + 1))  # Calculate the day of the season
-elif [ $day_of_year -ge 1 ] && [ $day_of_year -le 79 ]; then
-    season="Winter"
-    movement_num=1
-    season_start_date=1
-    season_end_date=79
-    days_in_season=79
-    day_of_season=$((day_of_year - season_start_date + 1))
-elif [ $day_of_year -ge 80 ] && [ $day_of_year -le 171 ]; then
-    season="Spring"
-    movement_num=2
-    season_start_date=80
-    season_end_date=171
-    days_in_season=92
-    day_of_season=$((day_of_year - season_start_date + 1))
-elif [ $day_of_year -ge 172 ] && [ $day_of_year -le 264 ]; then
-    season="Summer"
-    movement_num=4
-    season_start_date=172
-    season_end_date=264
-    days_in_season=93
-    day_of_season=$((day_of_year - season_start_date + 1))
-else
-    echo "Season not found for the current date"
-    exit 1
-fi
+SCRIPT_DIR="$(dirname "$(realpath "$0")")"
 
-# Debugging info: Print dynamic parameters
-echo "Season: $season"
-echo "Movement: $movement_num"
-echo "Day of Year: $day_of_year"
+# ── Configuration ──────────────────────────────────────────────────────────────
+base_dir="/home/motion/drives/local-2tb"
+music_base_dir="$base_dir/music/4 Seasons"
+[ ! -d "$music_base_dir" ] && music_base_dir="$SCRIPT_DIR/music"
 
-# Set the directory for the videos dynamically based on the season and movement
-video_base_dir="/home/motion/drives/local-2tb/movies/sunrise/$season/Mvt$movement_num"
-echo "Looking for video files in: $video_base_dir"
+FADE_DUR=2.0   # seconds for video + audio fade in/out
+ATTR_DUR=7     # duration of attribution card in seconds
 
-# Ensure the video directory exists
-if [ ! -d "$video_base_dir" ]; then
-    echo "Video directory $video_base_dir not found"
-    exit 1
-fi
+# ── Season / movement info ────────────────────────────────────────────────────
+# Optional first argument: YYYY-MM-DD of the last day of the movement to compile.
+# Used when called automatically from 4-seasons.sh (which processes yesterday's
+# images the next morning, so "today" would already be the next movement).
+# When run manually with no argument, uses today — correct for same-day runs.
+DATE_ARG="${1:-}"
+eval "$(python3 "$SCRIPT_DIR/season_info.py" ${DATE_ARG:+"$DATE_ARG"})"
+echo "Season=$SEASON  Mvt=$MVT_NUM  Day=$DAY_OF_MVT/$DAYS_IN_MVT  (ref date: ${DATE_ARG:-today})"
 
-# Find the music file for the current season and movement
-music_file=$(find "/home/motion/drives/local-2tb/music/4 Seasons" -type f -iname "*$season Mvt $movement_num*" | head -n 1)
-
-# Ensure the music file exists
-if [ ! -f "$music_file" ]; then
-    echo "Music file for $season Mvt $movement_num not found"
-    exit 1
-fi
-
-# Get the duration of the music file in seconds
-music_duration=$(ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "$music_file")
-echo "Music duration: $music_duration seconds"
-
-# Find all video files ending in "-final.mp4" using ls and grep
-video_files=()
-echo "Looking for video files in: $video_base_dir"
-for video_file in $(ls "$video_base_dir" | grep -i "Mvt${movement_num}.*-final.mp4"); do
-    full_path="$video_base_dir/$video_file"
-    if [ -f "$full_path" ]; then
-        video_files+=("$full_path")
-    fi
-done
-
-# Check if video files were found
-if [ ${#video_files[@]} -eq 0 ]; then
-    echo "No video files found for $season Mvt$movement_num in $video_base_dir"
-    exit 1
-else
-    echo "Found ${#video_files[@]} video files for $season Mvt$movement_num"
-fi
-
-# Prepare a temporary file for concatenation
-temp_file=$(mktemp)
-for video_file in "${video_files[@]}"; do
-    echo "file '$video_file'" >> "$temp_file"
-done
-
-# Set the output directory and file for the montage
-output_dir="$video_base_dir/$current_year-$month"
+# ── Locate files ──────────────────────────────────────────────────────────────
+script_name=$(basename "$SCRIPT_DIR" | cut -d'-' -f1)
+video_dir="$base_dir/movies/$script_name/$SEASON/Mvt$MVT_NUM"
+output_dir="$video_dir/montage"
 mkdir -p "$output_dir"
-output_file="$output_dir/$(date +"%Y-%m-%d")_Mvt$movement_num-Montage.mp4"
 
-# Create the final montage by concatenating the video files with the music
-echo "Creating montage for $season Mvt $movement_num..."
+music_file=$(find "$music_base_dir" -type f -iname "*${SEASON}*Mvt*${MVT_NUM}*" | sort | head -n 1)
+if [ -z "$music_file" ]; then
+    echo "ERROR: Music file not found for $SEASON Mvt $MVT_NUM"
+    exit 1
+fi
+music_duration=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$music_file")
+echo "Music: $(basename "$music_file")  ($music_duration s)"
 
-# Use ffmpeg to concatenate the video files and overlay the music
-ffmpeg -f concat -safe 0 -i "$temp_file" -i "$music_file" -c:v libx264 -pix_fmt yuv420p -c:a aac -strict experimental -shortest "$output_file"
+# ── Collect sorted daily clips ─────────────────────────────────────────────────
+mapfile -d '' daily_clips < <(find "$video_dir" -maxdepth 1 -name "*-final.mp4" -print0 | sort -z)
+if [ "${#daily_clips[@]}" -eq 0 ]; then
+    echo "ERROR: No *-final.mp4 clips in $video_dir"
+    exit 1
+fi
+echo "Found ${#daily_clips[@]} daily clips"
 
-# Clean up temporary file
-rm "$temp_file"
+# ── Detect source resolution from first clip ──────────────────────────────────
+# The attribution card is created at this same resolution so nothing is resized.
+VIDEO_W=$(ffprobe -v error -select_streams v:0 -show_entries stream=width  -of csv=p=0 "${daily_clips[0]}")
+VIDEO_H=$(ffprobe -v error -select_streams v:0 -show_entries stream=height -of csv=p=0 "${daily_clips[0]}")
+echo "Source resolution: ${VIDEO_W}x${VIDEO_H}"
 
-echo "Montage created: $output_file"
+# ── Temp-file tracking ────────────────────────────────────────────────────────
+TMPFILES=()
+cleanup() { rm -f "${TMPFILES[@]}" 2>/dev/null || true; }
+trap cleanup EXIT
+
+concat_list=$(mktemp --suffix=.txt); TMPFILES+=("$concat_list")
+printf "file '%s'\n" "${daily_clips[@]}" > "$concat_list"
+
+# ── Step 1: Concatenate clips, normalising to source resolution ───────────────
+# Normalise in case any clip differs (e.g. camera settings changed on one day).
+temp_concat=$(mktemp --suffix=.mp4); TMPFILES+=("$temp_concat")
+echo "Step 1/5: concatenating ${#daily_clips[@]} clips..."
+ffmpeg -loglevel warning \
+    -f concat -safe 0 -i "$concat_list" \
+    -vf "scale=${VIDEO_W}:${VIDEO_H}:force_original_aspect_ratio=decrease,\
+pad=${VIDEO_W}:${VIDEO_H}:(ow-iw)/2:(oh-ih)/2,setsar=1" \
+    -c:v libx264 -pix_fmt yuv420p -crf 26 -an \
+    -y "$temp_concat"
+
+# ── Step 2: Speed-adjust to match music duration exactly ──────────────────────
+concat_dur=$(ffprobe -v error -show_entries format=duration -of csv=p=0 "$temp_concat")
+speed_factor=$(echo "scale=6; $concat_dur / $music_duration" | bc)
+echo "Step 2/5: speed factor $speed_factor  (raw=${concat_dur}s  music=${music_duration}s)"
+
+temp_sped=$(mktemp --suffix=.mp4); TMPFILES+=("$temp_sped")
+ffmpeg -loglevel warning \
+    -i "$temp_concat" \
+    -vf "setpts=PTS/$speed_factor" \
+    -c:v libx264 -pix_fmt yuv420p -crf 26 -an \
+    -t "$music_duration" -y "$temp_sped"
+rm "$temp_concat"
+
+# ── Step 3: Merge with music + 2-second video/audio fade in/out ───────────────
+fade_out_start=$(echo "scale=3; $music_duration - $FADE_DUR" | bc)
+echo "Step 3/5: adding music and fades..."
+
+temp_main=$(mktemp --suffix=.mp4); TMPFILES+=("$temp_main")
+ffmpeg -loglevel warning \
+    -i "$temp_sped" -i "$music_file" \
+    -filter_complex \
+"[0:v]fade=t=in:st=0:d=${FADE_DUR},fade=t=out:st=${fade_out_start}:d=${FADE_DUR}[vout];\
+[1:a]afade=t=in:st=0:d=${FADE_DUR},afade=t=out:st=${fade_out_start}:d=${FADE_DUR}[aout]" \
+    -map "[vout]" -map "[aout]" \
+    -c:v libx264 -pix_fmt yuv420p -c:a aac -b:a 192k \
+    -t "$music_duration" -y "$temp_main"
+rm "$temp_sped"
+
+# ── Step 4: Create 7-second attribution card at source resolution ─────────────
+# Resolution matches the video — no resizing of the main montage required.
+echo "Step 4/5: creating attribution card at ${VIDEO_W}x${VIDEO_H}..."
+
+FONT=""
+FONT_BOLD=""
+if command -v fc-match &>/dev/null; then
+    FONT=$(fc-match "DejaVu Sans:style=Regular" --format="%{file}" 2>/dev/null || true)
+    FONT_BOLD=$(fc-match "DejaVu Sans:style=Bold"    --format="%{file}" 2>/dev/null || true)
+fi
+if [ -z "$FONT" ]; then
+    for f in \
+        /usr/share/fonts/truetype/dejavu/DejaVuSans.ttf \
+        /usr/share/fonts/dejavu/DejaVuSans.ttf \
+        /usr/share/fonts/TTF/DejaVuSans.ttf \
+        /usr/share/fonts/truetype/freefont/FreeSans.ttf; do
+        [ -f "$f" ] && { FONT="$f"; break; }
+    done
+fi
+[ -z "$FONT_BOLD" ] && FONT_BOLD="$FONT"
+
+# Font sizes are proportional to frame height so they look right at any resolution.
+# Colons inside drawtext text values must be escaped as \: (\\: in bash double-quotes).
+DT="drawtext=fontfile='${FONT_BOLD}':text='The Four Seasons - Antonio Vivaldi':fontcolor=white:fontsize=h/19:x=(w-text_w)/2:y=h*0.15"
+DT="${DT},drawtext=fontfile='${FONT}':text='Performed by John Harrison':fontcolor=0xDDDDDD:fontsize=h/26:x=(w-text_w)/2:y=h*0.32"
+DT="${DT},drawtext=fontfile='${FONT}':text='with the Wichita State University Chamber Players':fontcolor=0xDDDDDD:fontsize=h/30:x=(w-text_w)/2:y=h*0.43"
+DT="${DT},drawtext=fontfile='${FONT}':text='Source\\: Free Music Archive':fontcolor=white:fontsize=h/32:x=(w-text_w)/2:y=h*0.57"
+DT="${DT},drawtext=fontfile='${FONT}':text='freemusicarchive.org':fontcolor=0xFFFF88:fontsize=h/32:x=(w-text_w)/2:y=h*0.66"
+DT="${DT},drawtext=fontfile='${FONT}':text='License\\: CC BY-SA 3.0':fontcolor=0xCCCCCC:fontsize=h/34:x=(w-text_w)/2:y=h*0.76"
+DT="${DT},fade=t=in:st=0:d=1,fade=t=out:st=$((ATTR_DUR-1)):d=1"
+
+temp_attr=$(mktemp --suffix=.mp4); TMPFILES+=("$temp_attr")
+ffmpeg -loglevel warning \
+    -f lavfi -i "color=c=black:s=${VIDEO_W}x${VIDEO_H}:r=25:d=${ATTR_DUR}" \
+    -f lavfi -i "anullsrc=r=44100:cl=stereo" \
+    -vf "$DT" \
+    -c:v libx264 -pix_fmt yuv420p -c:a aac -b:a 192k \
+    -t "$ATTR_DUR" -y "$temp_attr"
+
+# ── Step 5: Join montage + attribution card ───────────────────────────────────
+echo "Step 5/5: joining montage and attribution card..."
+final_list=$(mktemp --suffix=.txt); TMPFILES+=("$final_list")
+printf "file '%s'\n" "$temp_main" "$temp_attr" > "$final_list"
+
+output_file="$output_dir/$(date +%Y-%m-%d)_${SEASON}_Mvt${MVT_NUM}-Montage.mp4"
+ffmpeg -loglevel warning \
+    -f concat -safe 0 -i "$final_list" \
+    -c copy -y "$output_file"
+
+echo "Done: $output_file"
diff --git a/season_info.py b/season_info.py
new file mode 100644
index 0000000..8cb13c8
--- /dev/null
+++ b/season_info.py
@@ -0,0 +1,172 @@
+#!/usr/bin/env python3
+"""
+season_info.py — output shell variables describing the current (or given) date's
+astronomical season and movement within that season.
+
+Season boundaries are the actual equinoxes/solstices computed via the Jean Meeus
+approximation (Astronomical Algorithms, Ch. 27 Table 27.a) and converted to the
+LOCAL timezone so the calendar date matches what the camera sees on the ground.
+DST transitions and year-to-year variation in the exact equinox moment are both
+handled correctly.
+
+Usage:
+    eval "$(python3 season_info.py [YYYY-MM-DD] [Timezone])"
+
+Arguments (both optional):
+    YYYY-MM-DD   Date to evaluate; defaults to today.
+    Timezone     IANA timezone name, e.g. America/New_York.
+                 Can also be set via the TIMEZONE environment variable.
+                 Defaults to America/New_York (matches the sunrise scripts).
+
+Outputs (shell-sourceable):
+    SEASON         Spring | Summer | Autumn | Winter
+    MVT_NUM        1 | 2 | 3
+    DAY_OF_MVT     day number within the movement (1-based)
+    DAYS_IN_MVT    total days in this movement
+    MVT_START      YYYY-MM-DD of movement start (local date)
+    MVT_END        YYYY-MM-DD of movement end   (local date)
+    SEASON_START   YYYY-MM-DD of season start   (local date)
+    SEASON_END     YYYY-MM-DD of season end     (local date)
+    IS_LAST_DAY    true | false
+"""
+
+import sys
+import os
+import datetime
+
+DEFAULT_TZ = "America/New_York"
+
+# ---------------------------------------------------------------------------
+# Timezone helpers — prefer pytz (already installed for sunrise.py),
+# fall back to zoneinfo (Python ≥ 3.9), then to UTC with a warning.
+# ---------------------------------------------------------------------------
+def _load_tz(name: str):
+    try:
+        import pytz
+        return pytz.timezone(name)
+    except ImportError:
+        pass
+    try:
+        from zoneinfo import ZoneInfo
+        return ZoneInfo(name)
+    except ImportError:
+        pass
+    print(f"WARNING: neither pytz nor zoneinfo available; using UTC instead of {name}", file=sys.stderr)
+    return datetime.timezone.utc
+
+
+def _utc_datetime_from_jde(jde: float) -> datetime.datetime:
+    """Convert Julian Day Number to a UTC datetime (including time of day)."""
+    jde_s = jde + 0.5          # shift so integer part = calendar day
+    Z = int(jde_s)
+    F = jde_s - Z              # fractional day = fraction of 24 h after midnight
+
+    if Z >= 2299161:
+        alpha = int((Z - 1867216.25) / 36524.25)
+        A = Z + 1 + alpha - alpha // 4
+    else:
+        A = Z
+    B = A + 1524
+    C = int((B - 122.1) / 365.25)
+    D = int(365.25 * C)
+    E = int((B - D) / 30.6001)
+
+    day_frac   = B - D - int(30.6001 * E) + F
+    day        = int(day_frac)
+    frac_hours = (day_frac - day) * 24
+    hour       = int(frac_hours)
+    frac_mins  = (frac_hours - hour) * 60
+    minute     = int(frac_mins)
+    second     = int((frac_mins - minute) * 60)
+
+    month = E - 1 if E < 14 else E - 13
+    year  = C - 4716 if month > 2 else C - 4715
+
+    return datetime.datetime(year, month, day, hour, minute, second,
+                             tzinfo=datetime.timezone.utc)
+
+
+def _season_starts_local(year: int, tz) -> dict:
+    """
+    Return the LOCAL calendar date (not UTC date) of each equinox/solstice
+    for the given year.  'tz' is a pytz/zoneinfo timezone object.
+    """
+    y = (year - 2000) / 1000.0
+
+    jdes = {
+        "Spring": 2451623.80984 + 365242.37404*y + 0.05169*y**2 - 0.00411*y**3 - 0.00057*y**4,
+        "Summer": 2451716.56767 + 365241.62603*y + 0.00325*y**2 + 0.00888*y**3 - 0.00030*y**4,
+        "Autumn": 2451810.21715 + 365242.01767*y - 0.11575*y**2 + 0.00337*y**3 + 0.00078*y**4,
+        "Winter": 2451900.05952 + 365242.74049*y - 0.06223*y**2 - 0.00823*y**3 + 0.00032*y**4,
+    }
+
+    result = {}
+    for name, jde in jdes.items():
+        utc_dt   = _utc_datetime_from_jde(jde)
+        local_dt = utc_dt.astimezone(tz)
+        result[name] = local_dt.date()
+    return result
+
+
+def get_info(date: datetime.date, tz_name: str = DEFAULT_TZ) -> dict:
+    tz   = _load_tz(tz_name)
+    year = date.year
+
+    cur  = _season_starts_local(year,     tz)
+    prev = _season_starts_local(year - 1, tz)
+    nxt  = _season_starts_local(year + 1, tz)
+
+    # Determine season and its inclusive start/end dates.
+    # Winter straddles the year boundary (Dec solstice → next Mar equinox).
+    if date < cur["Spring"]:
+        season, s_start, s_end = "Winter", prev["Winter"], cur["Spring"] - datetime.timedelta(days=1)
+    elif date < cur["Summer"]:
+        season, s_start, s_end = "Spring", cur["Spring"], cur["Summer"] - datetime.timedelta(days=1)
+    elif date < cur["Autumn"]:
+        season, s_start, s_end = "Summer", cur["Summer"], cur["Autumn"] - datetime.timedelta(days=1)
+    elif date < cur["Winter"]:
+        season, s_start, s_end = "Autumn", cur["Autumn"], cur["Winter"] - datetime.timedelta(days=1)
+    else:
+        season, s_start, s_end = "Winter", cur["Winter"], nxt["Spring"] - datetime.timedelta(days=1)
+
+    days_in_season = (s_end - s_start).days + 1
+
+    # Split season into 3 movements.  Mvt 1 and 2 get floor(n/3) days;
+    # Mvt 3 takes the remainder so no days are lost to integer rounding.
+    m1 = days_in_season // 3
+    m2 = days_in_season // 3
+    m3 = days_in_season - m1 - m2
+
+    m1_end = s_start   + datetime.timedelta(days=m1 - 1)
+    m2_end = m1_end    + datetime.timedelta(days=m2)
+    m3_end = s_end
+
+    if date <= m1_end:
+        mvt, mvt_start, mvt_end, days_in_mvt = 1, s_start,                        m1_end, m1
+    elif date <= m2_end:
+        mvt, mvt_start, mvt_end, days_in_mvt = 2, m1_end + datetime.timedelta(1), m2_end, m2
+    else:
+        mvt, mvt_start, mvt_end, days_in_mvt = 3, m2_end + datetime.timedelta(1), m3_end, m3
+
+    return {
+        "SEASON":       season,
+        "MVT_NUM":      mvt,
+        "DAY_OF_MVT":   (date - mvt_start).days + 1,
+        "DAYS_IN_MVT":  days_in_mvt,
+        "MVT_START":    mvt_start.isoformat(),
+        "MVT_END":      mvt_end.isoformat(),
+        "SEASON_START": s_start.isoformat(),
+        "SEASON_END":   s_end.isoformat(),
+        "IS_LAST_DAY":  str(date == mvt_end).lower(),
+    }
+
+
+if __name__ == "__main__":
+    args    = [a for a in sys.argv[1:] if not a.startswith("-")]
+    date_s  = args[0] if len(args) > 0 else None
+    tz_name = args[1] if len(args) > 1 else os.environ.get("TIMEZONE", DEFAULT_TZ)
+
+    date = datetime.date.fromisoformat(date_s) if date_s else datetime.date.today()
+
+    for k, v in get_info(date, tz_name).items():
+        print(f'{k}="{v}"')