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="$BASE_DIR"
diff --git a/fullday-video.sh b/fullday-video.sh
index 25d0ac6..e3bb633 100755
--- a/fullday-video.sh
+++ b/fullday-video.sh
@@ -12,8 +12,7 @@ source "$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/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..447b594 100644
--- a/sky-cam.conf
+++ b/sky-cam.conf
@@ -96,6 +96,17 @@ 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/sunrise_video.10s.sh b/sunrise_video.10s.sh
index 0ed4db0..2119670 100644
--- a/sunrise_video.10s.sh
+++ b/sunrise_video.10s.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"
@@ -110,8 +110,7 @@ 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)