Rozhen Observation Calendar

Which nights are best for a target over the coming weeks. The astronomy mark (darkness × altitude × Moon) is computed for every night; the weather and the overall mark exist only where Open-Meteo has a forecast (the next four days) or ERA5 history (past nights) — the rest is honestly blank.

Best nights for Andromeda Galaxy: 10-22 (100), 10-23 (100), 10-24 (100), 10-25 (100), 10-26 (100) — by astronomy; check the weather when the night is within four days.

2030-10-22astronomy score per night — click a bar for that night2030-11-20

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-10-22 Tue	100	—	unknown	20:05–06:05 (good, 10.0 h)	89.7° 00:00	10.12	19%	125.9°
2030-10-23 Wed	100	—	unknown	20:05–06:05 (good, 10.0 h)	89.7° 23:55	10.16	11%	136.0°
2030-10-24 Thu	100	—	unknown	20:00–06:00 (good, 10.0 h)	89.5° 23:50	10.2	5%	144.5°
2030-10-25 Fri	100	—	unknown	20:00–05:55 (good, 9.92 h)	89.6° 23:50	10.24	1%	149.6°
2030-10-26 Sat	100	—	unknown	20:00–04:55 (good, 9.92 h)	89.7° 23:45	10.28	0%	148.9°
2030-10-27 Sun	100	—	unknown	19:00–04:50 (good, 9.83 h)	89.7° 22:40	10.32	2%	142.4°
2030-10-28 Mon	100	—	unknown	18:55–04:45 (good, 9.83 h)	89.6° 22:35	10.35	6%	132.5°
2030-10-29 Tue	100	—	unknown	18:55–04:40 (good, 9.75 h)	89.5° 22:35	10.39	13%	120.9°
2030-10-30 Wed	100	—	unknown	18:55–04:35 (good, 9.67 h)	89.6° 22:30	10.43	22%	108.6°
2030-10-31 Thu	100	—	unknown	18:55–04:35 (good, 9.67 h)	89.7° 22:25	10.47	32%	96.3°
2030-11-01 Fri	100	—	unknown	18:50–04:30 (good, 9.67 h)	89.7° 22:20	10.5	44%	84.1°
2030-11-02 Sat	100	—	unknown	18:50–04:25 (good, 9.58 h)	89.6° 22:15	10.54	55%	72.3°
2030-11-03 Sun	99	—	unknown	18:50–04:20 (good, 9.5 h)	89.5° 22:15	10.57	65%	61.0°
2030-11-04 Mon	91	—	unknown	21:50–04:20 (good, 6.5 h)	89.7° 22:10	10.61	75%	50.6°
2030-11-05 Tue	83	—	unknown	03:10–04:15 (good, 1.08 h)	89.7° 22:05	10.64	83%	41.4°
2030-11-06 Wed	55	—	unknown	18:45–04:45 (marginal, 10.0 h)	89.7° 22:00	10.68	90%	34.2°
2030-11-07 Thu	35	—	unknown	23:10–04:15 (marginal, 5.08 h)	89.5° 21:55	10.71	95%	30.3°
2030-11-08 Fri	31	—	unknown	18:45–21:05 (marginal, 2.33 h)	89.6° 21:55	10.74	98%	30.7°
2030-11-09 Sat	37	—	unknown	18:45–22:05 (marginal, 3.33 h)	89.7° 21:50	10.78	100%	35.2°
2030-11-10 Sun	49	—	unknown	18:45–01:25 (marginal, 6.67 h)	89.7° 21:45	10.81	99%	42.4°
2030-11-11 Mon	63	—	unknown	18:45–19:30 (good, 0.75 h)	89.6° 21:40	10.84	97%	51.1°
2030-11-12 Tue	98	—	unknown	18:40–21:30 (good, 2.83 h)	89.5° 21:40	10.87	93%	60.5°
2030-11-13 Wed	100	—	unknown	18:40–00:20 (good, 5.67 h)	89.6° 21:35	10.9	88%	70.4°
2030-11-14 Thu	100	—	unknown	18:40–01:50 (good, 7.17 h)	89.7° 21:30	10.93	81%	80.5°
2030-11-15 Fri	100	—	unknown	18:40–03:05 (good, 8.42 h)	89.7° 21:25	10.96	73%	90.8°
2030-11-16 Sat	100	—	unknown	18:40–03:10 (good, 8.5 h)	89.6° 21:20	10.99	64%	101.3°
2030-11-17 Sun	100	—	unknown	18:40–03:15 (good, 8.58 h)	89.5° 21:20	11.02	54%	111.7°
2030-11-18 Mon	100	—	unknown	18:40–03:15 (good, 8.58 h)	89.7° 21:15	11.04	44%	122.1°
2030-11-19 Tue	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.7° 21:10	11.07	34%	132.2°
2030-11-20 Wed	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.7° 21:05	11.1	24%	141.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-10-22&days=30"
curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&days=30&format=csv" -o m31-calendar.csv

One row per night: score_astronomy always, score_weather / score only where a forecast or history exists (null otherwise, with weather_source saying which), best window, dark hours, Moon illumination and separation, transit. 7–60 nights. Errors: 400 with invalid_date or target_unresolved. Results are cached for six hours; calculation version 2026-10-10.1.