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: 11-20 (100), 11-21 (100), 11-22 (100), 11-23 (100), 11-24 (100) — by astronomy; check the weather when the night is within four days.

2032-11-20astronomy score per night — click a bar for that night2032-12-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-11-20 Sat	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.7° 21:05	11.11	85%	81.3°
2032-11-21 Sun	100	—	unknown	18:35–02:35 (good, 8.0 h)	89.8° 21:00	11.13	78%	91.8°
2032-11-22 Mon	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.6° 20:55	11.16	69%	102.1°
2032-11-23 Tue	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.5° 20:50	11.18	60%	111.9°
2032-11-24 Wed	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.6° 20:50	11.2	50%	121.3°
2032-11-25 Thu	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.7° 20:45	11.22	41%	130.1°
2032-11-26 Fri	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.7° 20:40	11.25	32%	137.8°
2032-11-27 Sat	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.6° 20:35	11.27	23%	143.7°
2032-11-28 Sun	100	—	unknown	18:35–02:40 (good, 8.08 h)	89.5° 20:35	11.29	16%	146.8°
2032-11-29 Mon	100	—	unknown	18:35–02:40 (good, 8.08 h)	89.7° 20:30	11.3	9%	146.0°
2032-11-30 Tue	100	—	unknown	18:35–02:35 (good, 8.0 h)	89.8° 20:25	11.32	4%	141.4°
2032-12-01 Wed	100	—	unknown	18:35–02:30 (good, 7.92 h)	89.7° 20:20	11.34	1%	133.9°
2032-12-02 Thu	100	—	unknown	18:35–02:25 (good, 7.83 h)	89.5° 20:15	11.36	0%	124.4°
2032-12-03 Fri	100	—	unknown	18:35–02:20 (good, 7.75 h)	89.6° 20:15	11.37	2%	113.9°
2032-12-04 Sat	100	—	unknown	18:35–02:20 (good, 7.75 h)	89.7° 20:10	11.39	5%	102.6°
2032-12-05 Sun	100	—	unknown	18:35–02:15 (good, 7.67 h)	89.8° 20:05	11.4	11%	90.9°
2032-12-06 Mon	100	—	unknown	18:35–02:10 (good, 7.58 h)	89.7° 20:00	11.41	20%	79.1°
2032-12-07 Tue	100	—	unknown	18:35–02:05 (good, 7.5 h)	89.5° 19:55	11.43	29%	67.5°
2032-12-08 Wed	96	—	unknown	18:35–02:00 (good, 7.42 h)	89.6° 19:55	11.44	40%	56.4°
2032-12-09 Thu	88	—	unknown	18:35–02:00 (good, 7.42 h)	89.7° 19:50	11.45	52%	46.3°
2032-12-10 Fri	77	—	unknown	20:35–01:55 (good, 5.33 h)	89.7° 19:45	11.46	63%	38.2°
2032-12-11 Sat	52	—	unknown	18:35–02:20 (marginal, 7.75 h)	89.6° 19:40	11.47	73%	33.6°
2032-12-12 Sun	37	—	unknown	18:35–02:00 (marginal, 7.42 h)	89.5° 19:40	11.48	82%	33.8°
2032-12-13 Mon	33	—	unknown	18:35–01:40 (marginal, 7.08 h)	89.7° 19:35	11.48	90%	38.7°
2032-12-14 Tue	37	—	unknown	18:35–01:25 (marginal, 6.83 h)	89.8° 19:30	11.49	96%	46.7°
2032-12-15 Wed	47	—	unknown	18:35–01:20 (marginal, 6.75 h)	89.7° 19:25	11.49	99%	56.3°
2032-12-16 Thu	64	—	unknown	18:35–19:45 (good, 1.17 h)	89.6° 19:20	11.5	100%	66.7°
2032-12-17 Fri	74	—	unknown	18:35–22:15 (good, 3.67 h)	89.6° 19:20	11.5	99%	77.3°
2032-12-18 Sat	100	—	unknown	18:35–23:30 (good, 4.92 h)	89.7° 19:15	11.5	95%	87.9°
2032-12-19 Sun	100	—	unknown	18:35–00:45 (good, 6.17 h)	89.8° 19:10	11.51	90%	98.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-11-20&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.