diff --git a/4-seasons.sh b/4-seasons.sh
index 0109c1f..8502960 100755
--- a/4-seasons.sh
+++ b/4-seasons.sh
@@ -12,6 +12,7 @@ set -x
 
 SCRIPT_DIR="$(dirname "$(realpath "$0")")"
 source "$SCRIPT_DIR/sky-cam.conf"
+export TIMEZONE   # make it visible to season_info.py subprocess
 
 # ── Configuration ──────────────────────────────────────────────────────────────
 base_dir="$BASE_DIR"
diff --git a/sunrise_video.10s.sh b/daily_sunrise_video.sh
similarity index 86%
rename from sunrise_video.10s.sh
rename to daily_sunrise_video.sh
index 0ed4db0..04082bd 100644
--- a/sunrise_video.10s.sh
+++ b/daily_sunrise_video.sh
@@ -28,11 +28,11 @@ fi
 # Output the sunrise time in UTC
 echo "Sunrise time (UTC): $sunrise_time"
 
-# Set the time zone to Eastern US time (America/New_York)
-export TZ="America/New_York"
+# Export timezone so date and subprocesses use the configured local time.
+export TZ="$TIMEZONE"
 
-# Convert sunrise time from UTC to Eastern Time (ET)
-sunrise_time_et=$(TZ="America/New_York" date -d "$sunrise_time" +"%H-%M-%S")
+# Convert sunrise time from UTC to local time.
+sunrise_time_et=$(TZ="$TIMEZONE" date -d "$sunrise_time" +"%H-%M-%S")
 
 # Output the converted sunrise time in Eastern Time
 echo "Sunrise time (Eastern Time): $sunrise_time_et"
@@ -46,9 +46,9 @@ time_to_seconds() {
 # Convert sunrise time (in Eastern Time) to seconds since midnight
 sunrise_seconds=$(time_to_seconds "$sunrise_time_et")
 
-# Calculate the start and end times (60 minutes before sunrise and 15 minutes after sunrise)
-start_seconds=$((sunrise_seconds - 70 * 60))  # 60 minutes before sunrise
-end_seconds=$((sunrise_seconds + 10 * 60))   # 20 minutes after sunrise
+# Calculate the capture window around sunrise.
+start_seconds=$((sunrise_seconds - SUNRISE_PRE_MIN * 60))
+end_seconds=$((sunrise_seconds + SUNRISE_POST_MIN * 60))
 
 # Output the start and end times in seconds for debugging
 echo "Start seconds: $start_seconds"
@@ -110,18 +110,16 @@ echo "Initial video duration: $video_duration"
 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
 
-# Target video duration: 10 seconds
-target_duration=8
+target_duration=$SUNRISE_TARGET_SECS
 
-# Calculate the speed-up factor to make the video fit into the target duration of 10 seconds
 speed_up_factor=$(echo "scale=3; $total_seconds / $target_duration" | bc)
 echo "Calculated speed-up factor: $speed_up_factor"
 
 # Output filename for the second movie (speed-adjusted)
-final_video="$output_dir/$current_date-sunrise-10s.mp4"
+final_video="$output_dir/$current_date-daily-sunrise.mp4"
 
 # Apply the speed adjustment using the setpts filter
-echo "Adjusting video speed to target duration of 10 seconds..."
+echo "Adjusting video speed to ${SUNRISE_TARGET_SECS}s..."
 ffmpeg -i "$first_movie" -filter:v "setpts=PTS/$speed_up_factor" -y "$final_video"
 
 # Check the duration of the adjusted video
diff --git a/fullday-video.sh b/fullday-video.sh
index 25d0ac6..e3bb633 100755
--- a/fullday-video.sh
+++ b/fullday-video.sh
@@ -12,8 +12,7 @@ source "$SCRIPT_DIR/sky-cam.conf"
 
 # ── Configuration ──────────────────────────────────────────────────────────────
 base_dir="$BASE_DIR"
-FULLDAY_FPS=5       # timelapse frame rate — adjust to taste
-RETENTION_DAYS=10   # full-day videos older than this are deleted
+# FULLDAY_FPS and RETENTION_DAYS come from sky-cam.conf
 
 # ── Date / paths ──────────────────────────────────────────────────────────────
 yesterday=$(date --date="yesterday" +%Y-%m-%d)
diff --git a/install.sh b/install.sh
index b3e16d8..0dfb66d 100755
--- a/install.sh
+++ b/install.sh
@@ -77,7 +77,7 @@ echo "  wrote sky-cam-notify-failure@.service"
 # Sunrise video → Mattermost (run after sunrise window ends)
 write_service "sky-cam-sunrise" \
     "daily sunrise video → Mattermost" \
-    "sunrise_video.10s.sh" \
+    "daily_sunrise_video.sh" \
     "After=network-online.target\nWants=network-online.target\n"
 write_timer "sky-cam-sunrise" "daily sunrise video" "*-*-* 09:00:00"
 
diff --git a/montage-mvt.sh b/montage-mvt.sh
index 5885ff5..eac3436 100755
--- a/montage-mvt.sh
+++ b/montage-mvt.sh
@@ -20,6 +20,7 @@ set -euo pipefail
 
 SCRIPT_DIR="$(dirname "$(realpath "$0")")"
 source "$SCRIPT_DIR/sky-cam.conf"
+export TIMEZONE   # make it visible to season_info.py subprocess
 
 # ── Configuration ──────────────────────────────────────────────────────────────
 base_dir="$BASE_DIR"
diff --git a/sky-cam.conf b/sky-cam.conf
index 85df032..57b1d4a 100644
--- a/sky-cam.conf
+++ b/sky-cam.conf
@@ -37,7 +37,7 @@
 # -----------------------------------------------------------------------------
 #
 #  You run / schedule:
-#    sunrise_video.10s.sh  — daily at 09:00 (via systemd)
+#    daily_sunrise_video.sh — daily at 09:00 (via systemd)
 #                            grabs today's sunrise images, makes a 10-second
 #                            video, uploads it to Mattermost
 #
@@ -72,8 +72,76 @@
 #  Helpers (called by the scripts above, not run directly):
 #    notify.sh             — sends notifications via ntfy / email / Mattermost
 #    season_info.py        — outputs astronomical season/movement/year for a date
-#    sunrise.py            — outputs today's sunrise time (used by sunrise_video)
+#    sunrise.py            — outputs today's sunrise time (used by daily_sunrise_video)
 #    sunrise2mm.py         — uploads the sunrise video to Mattermost
+#    sunrise_overlay.py    — burns a timestamp overlay onto the sunrise video
+#
+# -----------------------------------------------------------------------------
+# FILE DEPENDENCIES — who calls whom, and what to update if you rename a file
+# -----------------------------------------------------------------------------
+#
+#  sky-cam.conf  (this file)
+#    ← sourced by every .sh script; read by sunrise.py, sunrise2mm.py
+#    → if renamed: update the 'source' line at the top of ALL scripts
+#                  (don't rename it — just edit it in place)
+#
+#  install.sh
+#    ← run manually; reads this conf
+#    → if renamed: update the note at the top of this conf file only
+#    generates → systemd unit files (sky-cam-*.service / .timer)
+#                and sky-cam-notify-failure@.service
+#
+#  daily_sunrise_video.sh
+#    ← called by systemd sky-cam-sunrise.timer (09:00)
+#    → if renamed: update install.sh (write_service call, line ~80)
+#                  then re-run install.sh to regenerate the unit
+#    calls → sunrise.py, sunrise_overlay.py, sunrise2mm.py
+#
+#  4-seasons.sh
+#    ← called by systemd sky-cam-4seasons.timer (01:00)
+#    → if renamed: update install.sh (write_service call, line ~86)
+#                  then re-run install.sh
+#    calls → season_info.py, montage-mvt.sh
+#
+#  fullday-video.sh
+#    ← called by systemd sky-cam-fullday.timer (02:00)
+#    → if renamed: update install.sh (write_service call, line ~93)
+#                  then re-run install.sh
+#
+#  montage-mvt.sh
+#    ← called by 4-seasons.sh on the last day of each movement
+#    → if renamed: update 4-seasons.sh (the exec line near the bottom)
+#    calls → season_info.py, notify.sh, year-end-join.sh
+#
+#  year-end-join.sh
+#    ← called by montage-mvt.sh at end of Autumn Mvt 3
+#    → if renamed: update montage-mvt.sh (the exec line at the bottom)
+#    calls → notify.sh
+#
+#  notify.sh
+#    ← called by montage-mvt.sh, year-end-join.sh
+#       also referenced in install.sh for the OnFailure= failure template
+#    → if renamed: update montage-mvt.sh, year-end-join.sh, install.sh
+#
+#  season_info.py
+#    ← called by 4-seasons.sh and montage-mvt.sh
+#    → if renamed: update 4-seasons.sh and montage-mvt.sh (the eval lines)
+#
+#  sunrise.py
+#    ← called by daily_sunrise_video.sh
+#    → if renamed: update daily_sunrise_video.sh
+#
+#  sunrise_overlay.py
+#    ← called by daily_sunrise_video.sh
+#    → if renamed: update daily_sunrise_video.sh
+#
+#  sunrise2mm.py
+#    ← called by daily_sunrise_video.sh
+#    → if renamed: update daily_sunrise_video.sh
+#
+#  stitch-cameras.py
+#    ← run manually only; no script calls it
+#    → safe to rename with no other changes needed
 #
 # =============================================================================
 
@@ -96,6 +164,17 @@ LATITUDE=38.123456
 LONGITUDE=-97.654321
 TIMEZONE=America/New_York
 
+# ── Sunrise video tuning ──────────────────────────────────────────────────────
+# How many minutes before/after sunrise to include in the daily clip.
+SUNRISE_PRE_MIN=70
+SUNRISE_POST_MIN=10
+# Target duration (seconds) for the speed-adjusted sunrise video.
+SUNRISE_TARGET_SECS=10
+
+# ── Full-day timelapse tuning ─────────────────────────────────────────────────
+FULLDAY_FPS=5        # frame rate of the timelapse video
+RETENTION_DAYS=10    # delete full-day videos older than this many days
+
 # ── Mattermost — daily sunrise upload ─────────────────────────────────────────
 mattermost_url=https://your-mattermost-server.example.com
 access_token=your-access-token-here
diff --git a/sunrise2mm.py b/sunrise2mm.py
index 9bafcfe..6b3c0d0 100644
--- a/sunrise2mm.py
+++ b/sunrise2mm.py
@@ -53,8 +53,7 @@ if not os.path.isdir(output_dir):
     print(f"Error: The directory {output_dir} does not exist. The video may not have been created yet.")
     exit(1)
 
-# Find the sunrise video file for today (e.g., 2024-11-05-sunrise-10s.mp4)
-final_video_file = os.path.join(output_dir, f"{today_date_str}-sunrise-10s.mp4")
+final_video_file = os.path.join(output_dir, f"{today_date_str}-daily-sunrise.mp4")
 
 # Debugging: print the full path of the video file to make sure it's correct
 print(f"Looking for video file: {final_video_file}")
diff --git a/systemd/sky-cam-sunrise.service b/systemd/sky-cam-sunrise.service
index 2f58c2d..6467355 100644
--- a/systemd/sky-cam-sunrise.service
+++ b/systemd/sky-cam-sunrise.service
@@ -7,6 +7,6 @@ OnFailure=sky-cam-notify-failure@%n.service
 [Service]
 Type=oneshot
 # ── Edit this path ────────────────────────────────────────────────────────────
-ExecStart=/home/motion/drives/local-2tb/sunrise-scripts/sunrise_video.10s.sh
+ExecStart=/home/motion/drives/local-2tb/sunrise-scripts/daily_sunrise_video.sh
 StandardOutput=journal
 StandardError=journal