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: 10-25 (100), 10-26 (100), 10-27 (100), 10-28 (100), 11-06 (100) — by astronomy; check the weather when the night is within four days.

2036-10-25astronomy score per night — click a bar for that night2036-11-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-10-25 Sat	100	—	unknown	20:00–04:55 (good, 9.92 h)	89.6° 23:45	10.26	39%	94.9°
2036-10-26 Sun	100	—	unknown	19:00–04:50 (good, 9.83 h)	89.5° 22:45	10.3	49%	85.5°
2036-10-27 Mon	100	—	unknown	18:55–04:45 (good, 9.83 h)	89.7° 22:40	10.34	58%	76.3°
2036-10-28 Tue	100	—	unknown	18:55–04:45 (good, 9.83 h)	89.8° 22:35	10.37	67%	67.3°
2036-10-29 Wed	95	—	unknown	18:55–04:40 (good, 9.75 h)	89.7° 22:30	10.41	76%	58.7°
2036-10-30 Thu	88	—	unknown	23:55–04:35 (good, 4.67 h)	89.6° 22:25	10.45	83%	50.9°
2036-10-31 Fri	81	—	unknown	03:50–04:30 (good, 0.67 h)	89.6° 22:25	10.49	90%	44.3°
2036-11-01 Sat	47	—	unknown	18:50–05:00 (marginal, 10.17 h)	89.7° 22:20	10.52	95%	39.7°
2036-11-02 Sun	47	—	unknown	18:50–04:30 (marginal, 9.67 h)	89.8° 22:15	10.56	98%	38.2°
2036-11-03 Mon	50	—	unknown	18:50–04:10 (marginal, 9.33 h)	89.7° 22:10	10.59	100%	40.2°
2036-11-04 Tue	58	—	unknown	18:50–04:00 (marginal, 9.17 h)	89.5° 22:05	10.63	99%	45.6°
2036-11-05 Wed	66	—	unknown	18:45–20:25 (good, 1.67 h)	89.6° 22:05	10.66	96%	53.4°
2036-11-06 Thu	100	—	unknown	18:45–22:40 (good, 3.92 h)	89.7° 22:00	10.7	90%	62.7°
2036-11-07 Fri	100	—	unknown	18:45–01:20 (good, 6.58 h)	89.8° 21:55	10.73	83%	73.0°
2036-11-08 Sat	100	—	unknown	18:45–02:55 (good, 8.17 h)	89.6° 21:50	10.76	73%	83.9°
2036-11-09 Sun	100	—	unknown	18:45–03:35 (good, 8.83 h)	89.5° 21:50	10.79	63%	94.9°
2036-11-10 Mon	100	—	unknown	18:45–03:40 (good, 8.92 h)	89.7° 21:45	10.83	52%	105.8°
2036-11-11 Tue	100	—	unknown	18:40–03:45 (good, 9.08 h)	89.8° 21:40	10.86	40%	116.4°
2036-11-12 Wed	100	—	unknown	18:40–03:40 (good, 9.0 h)	89.7° 21:35	10.89	29%	126.1°
2036-11-13 Thu	100	—	unknown	18:40–03:40 (good, 9.0 h)	89.6° 21:30	10.92	20%	134.3°
2036-11-14 Fri	100	—	unknown	18:40–03:35 (good, 8.92 h)	89.5° 21:30	10.95	12%	139.9°
2036-11-15 Sat	100	—	unknown	18:40–03:35 (good, 8.92 h)	89.7° 21:25	10.98	5%	141.8°
2036-11-16 Sun	100	—	unknown	18:40–03:30 (good, 8.83 h)	89.8° 21:20	11.0	2%	139.5°
2036-11-17 Mon	100	—	unknown	18:40–03:25 (good, 8.75 h)	89.7° 21:15	11.03	0%	133.9°
2036-11-18 Tue	100	—	unknown	18:35–03:20 (good, 8.75 h)	89.5° 21:10	11.06	1%	126.2°
2036-11-19 Wed	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.6° 21:10	11.08	4%	117.3°
2036-11-20 Thu	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.7° 21:05	11.11	9%	108.0°
2036-11-21 Fri	100	—	unknown	18:35–03:10 (good, 8.58 h)	89.8° 21:00	11.13	15%	98.4°
2036-11-22 Sat	100	—	unknown	18:35–03:05 (good, 8.5 h)	89.7° 20:55	11.16	23%	88.9°
2036-11-23 Sun	100	—	unknown	18:35–03:00 (good, 8.42 h)	89.5° 20:55	11.18	32%	79.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-10-25&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.