skyfield's sunrise_sunset() internally computes ephemeris['earth'] + topos,
so passing the already-combined _observer caused a double-add ValueError.
Store _topos separately and use it only for almanac calls; _observer
(earth + topos) continues to be used for direct .at() observations.
https://claude.ai/code/session_01JieSeNQZ3X6fhsb11YyJrK
moon_phase.py: add sun_events_in_range() — returns actual sunset/sunrise
transitions via skyfield almanac, accurate to within a minute
moon_phase_monthly.py:
- _dark_moon_intervals(): replace sun-altitude threshold sampling with
actual sunset/sunrise times; dark window = sunset + DARK_START_MIN to
next sunrise; moon-above-horizon check still sampled every 10 min within
each night; polar fallback if no sun events found
- run_phase(): sort dark-window frames by proximity to exact phase moment
before scanning; first clear detection = the frame temporally closest to
the moon being precisely full/at quarter, not just the first in time order
- Replace DARK_SKY_SUN_ALT_DEG with DARK_START_MIN (default 30 min)
sky-cam.conf: replace MOON_DARK_SKY_SUN_ALT_DEG with MOON_DARK_START_MIN=30;
update comments to explain ±24h window, sunset+30 start, closest-frame logic,
and how the 01:30 and 23:55 edge cases are handled
https://claude.ai/code/session_01HkTxpNSTWtViZzxbrbKytR
moon_phase.py: add sun_altaz() to compute sun altitude for dark-sky check
moon_phase_monthly.py:
- Replace fixed 22:00-23:00 window with dynamic dark+moon intervals:
sample every 10 min across ±24h of the phase moment, keep blocks where
sun < DARK_SKY_SUN_ALT_DEG and moon > MIN_ALTITUDE — covers the full
night the moon is actually visible in a dark sky regardless of month
- First east frame with quality >= MIN_QUALITY in that window wins
- Illumination% computed at the detection time and shown in the image
caption and Mattermost message
- Remove OBS_TIME_H/M; add DARK_SKY_SUN_ALT_DEG config var
sky-cam.conf: replace MOON_OBS_TIME_LOCAL with MOON_DARK_SKY_SUN_ALT_DEG=-6
and explain the sun-altitude threshold options
https://claude.ai/code/session_01HkTxpNSTWtViZzxbrbKytR
Two new jobs operate on the SUNRISE_CAM, sharing three Python helpers
(moon_phase, moon_detect, moon_composite) and one cached lunar texture:
- moon-track.sh: nightly batch detects the moon in each east frame,
crops a 480x480 box around it, stitches into an mp4 that holds the
moon roughly centred while clouds and stars drift past.
- moon-phase-monthly.sh: daily check that runs whichever phase composite
is due that day. Handles full moon (posts D+3), first quarter (D+2,
best-effort due to daytime-only geometry from east), and third quarter
(D+2). Picks the frame closest in time to the exact phase moment that
meets quality / altitude / illumination thresholds, then composites
the cached lunar texture into it -- sky/halo/parallactic-angle/timing
real from east, surface detail borrowed from the reference image.
Honest-by-design: a 38-px white blob from a wide-field IP camera cannot
be enhanced into crater detail by software. The composite makes the
borrowing explicit and constrains everything else (when, where, sky,
orientation) to match what east actually saw.
install.sh now downloads the skyfield ephemeris (de421.bsp) and the
default lunar reference (Wikipedia CC BY-SA full-moon photo) on first
run. Both can be overridden via .env.
https://claude.ai/code/session_015PBVDESC3KLMbq1LpA6qLn
Claude