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 Great Orion Nebula: 12-01 (89), 12-02 (89), 12-03 (89), 12-04 (89), 12-05 (89) — by astronomy; check the weather when the night is within four days.

2032-12-01astronomy score per night — click a bar for that night2032-12-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-12-01 Wed	89	—	unknown	22:00–04:30 (good, 6.5 h)	42.9° 01:15	11.34	1%	145.0°
2032-12-02 Thu	89	—	unknown	21:55–04:30 (good, 6.58 h)	42.9° 01:10	11.36	0%	152.7°
2032-12-03 Fri	89	—	unknown	21:50–04:25 (good, 6.58 h)	42.9° 01:05	11.37	2%	155.4°
2032-12-04 Sat	89	—	unknown	21:45–04:20 (good, 6.58 h)	42.9° 01:00	11.39	5%	151.5°
2032-12-05 Sun	89	—	unknown	21:45–04:15 (good, 6.5 h)	42.9° 00:55	11.4	11%	142.8°
2032-12-06 Mon	89	—	unknown	21:40–04:10 (good, 6.5 h)	42.9° 00:55	11.41	20%	131.7°
2032-12-07 Tue	89	—	unknown	21:35–04:10 (good, 6.58 h)	42.9° 00:50	11.43	29%	119.5°
2032-12-08 Wed	89	—	unknown	21:40–04:05 (good, 6.42 h)	42.9° 00:45	11.44	40%	106.9°
2032-12-09 Thu	89	—	unknown	21:40–04:00 (good, 6.33 h)	42.9° 00:40	11.45	52%	94.1°
2032-12-10 Fri	88	—	unknown	21:50–03:55 (good, 6.08 h)	42.9° 00:35	11.46	63%	81.3°
2032-12-11 Sat	84	—	unknown	23:15–03:50 (good, 4.58 h)	42.9° 00:35	11.47	73%	68.6°
2032-12-12 Sun	60	—	unknown	03:40–03:50 (good, 0.17 h)	42.9° 00:30	11.48	82%	56.3°
2032-12-13 Mon	34	—	unknown	21:35–04:05 (marginal, 6.5 h)	42.9° 00:25	11.48	90%	44.7°
2032-12-14 Tue	19	—	unknown	00:50–03:40 (marginal, 2.83 h)	42.9° 00:20	11.49	96%	34.4°
2032-12-15 Wed	12	—	unknown	—	42.9° 00:15	11.49	99%	26.9°
2032-12-16 Thu	10	—	unknown	—	42.9° 00:15	11.5	100%	24.6°
2032-12-17 Fri	13	—	unknown	—	42.9° 00:10	11.5	99%	28.5°
2032-12-18 Sat	21	—	unknown	20:50–00:25 (marginal, 3.58 h)	42.9° 00:05	11.5	95%	36.3°
2032-12-19 Sun	36	—	unknown	20:25–03:00 (marginal, 6.58 h)	42.9° 00:00	11.51	90%	45.9°
2032-12-20 Mon	58	—	unknown	20:45–20:50 (good, 0.08 h)	42.9° 00:00	11.51	84%	56.2°
2032-12-21 Tue	83	—	unknown	20:40–00:50 (good, 4.17 h)	42.9° 23:55	11.51	76%	66.8°
2032-12-22 Wed	87	—	unknown	20:35–02:30 (good, 5.92 h)	42.9° 23:50	11.51	68%	77.5°
2032-12-23 Thu	89	—	unknown	20:30–02:45 (good, 6.25 h)	42.9° 23:45	11.5	59%	88.2°
2032-12-24 Fri	89	—	unknown	20:30–02:50 (good, 6.33 h)	42.9° 23:40	11.5	49%	99.0°
2032-12-25 Sat	89	—	unknown	20:25–02:50 (good, 6.42 h)	42.9° 23:40	11.5	40%	109.8°
2032-12-26 Sun	89	—	unknown	20:20–02:50 (good, 6.5 h)	42.9° 23:35	11.49	31%	120.6°
2032-12-27 Mon	89	—	unknown	20:15–02:50 (good, 6.58 h)	42.9° 23:30	11.49	22%	131.3°
2032-12-28 Tue	89	—	unknown	20:10–02:45 (good, 6.58 h)	42.9° 23:25	11.48	14%	141.5°
2032-12-29 Wed	89	—	unknown	20:10–02:40 (good, 6.5 h)	42.9° 23:20	11.47	8%	150.2°
2032-12-30 Thu	89	—	unknown	20:05–02:40 (good, 6.58 h)	42.9° 23:20	11.47	3%	155.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-01&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.