[Unit]
Description=Sky-Cam sunrise video — daily at 09:00

[Timer]
# Run at 09:00 every day (after sunrise window has ended).
OnCalendar=*-*-* 09:00:00
# If the system was off at 09:00, run as soon as it boots (within 1 hour).
Persistent=true

[Install]
WantedBy=timers.target