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: 11-11 (89), 11-12 (89), 11-26 (89), 11-27 (89), 11-28 (89) — by astronomy; check the weather when the night is within four days.

2032-11-11astronomy score per night — click a bar for that night2032-12-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-11-11 Thu	89	—	unknown	23:30–05:35 (good, 6.08 h)	42.9° 02:30	10.86	66%	104.2°
2032-11-12 Fri	89	—	unknown	23:40–05:35 (good, 5.92 h)	42.9° 02:25	10.89	77%	91.2°
2032-11-13 Sat	87	—	unknown	00:45–05:35 (good, 4.83 h)	42.9° 02:25	10.92	86%	78.1°
2032-11-14 Sun	80	—	unknown	03:45–05:35 (good, 1.83 h)	42.9° 02:20	10.95	93%	65.2°
2032-11-15 Mon	38	—	unknown	23:20–05:40 (marginal, 6.33 h)	42.9° 02:15	10.97	98%	52.6°
2032-11-16 Tue	23	—	unknown	01:35–05:40 (marginal, 4.08 h)	42.9° 02:10	11.0	100%	41.0°
2032-11-17 Wed	14	—	unknown	04:35–05:00 (marginal, 0.42 h)	42.9° 02:10	11.03	99%	31.3°
2032-11-18 Thu	12	—	unknown	—	42.9° 02:05	11.06	97%	25.3°
2032-11-19 Fri	15	—	unknown	23:15–23:35 (marginal, 0.33 h)	42.9° 02:00	11.08	92%	25.3°
2032-11-20 Sat	23	—	unknown	22:40–03:50 (marginal, 5.17 h)	42.9° 01:55	11.11	85%	31.0°
2032-11-21 Sun	38	—	unknown	22:15–05:05 (marginal, 6.83 h)	42.9° 01:50	11.13	78%	39.6°
2032-11-22 Mon	56	—	unknown	22:05–05:20 (marginal, 7.25 h)	42.9° 01:50	11.16	69%	49.4°
2032-11-23 Tue	79	—	unknown	22:30–03:20 (good, 4.83 h)	42.9° 01:45	11.18	60%	59.7°
2032-11-24 Wed	85	—	unknown	22:25–04:30 (good, 6.08 h)	42.9° 01:40	11.2	50%	70.3°
2032-11-25 Thu	88	—	unknown	22:20–04:40 (good, 6.33 h)	42.9° 01:35	11.22	41%	81.0°
2032-11-26 Fri	89	—	unknown	22:20–04:40 (good, 6.33 h)	42.9° 01:30	11.25	32%	91.8°
2032-11-27 Sat	89	—	unknown	22:15–04:45 (good, 6.5 h)	42.9° 01:30	11.27	23%	102.7°
2032-11-28 Sun	89	—	unknown	22:10–04:40 (good, 6.5 h)	42.9° 01:25	11.29	16%	113.6°
2032-11-29 Mon	89	—	unknown	22:05–04:40 (good, 6.58 h)	42.9° 01:20	11.3	9%	124.5°
2032-11-30 Tue	89	—	unknown	22:00–04:35 (good, 6.58 h)	42.9° 01:15	11.32	4%	135.2°
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°

Download: CSV · JSON

💡 API

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