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: 10-29 (89), 10-30 (89), 10-31 (89), 11-01 (89), 11-02 (89) — by astronomy; check the weather when the night is within four days.

2032-10-23astronomy score per night — click a bar for that night2032-11-21

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-10-23 Sat	24	—	unknown	01:20–06:15 (marginal, 4.92 h)	42.9° 04:45	10.18	71%	27.0°
2032-10-24 Sun	36	—	unknown	01:00–06:15 (marginal, 5.25 h)	42.9° 04:40	10.22	62%	33.9°
2032-10-25 Mon	51	—	unknown	01:55–05:00 (good, 3.08 h)	42.9° 04:40	10.26	52%	42.9°
2032-10-26 Tue	68	—	unknown	01:35–06:15 (good, 4.67 h)	42.9° 04:35	10.3	42%	52.8°
2032-10-27 Wed	82	—	unknown	01:15–06:20 (good, 5.08 h)	42.9° 04:30	10.34	33%	63.2°
2032-10-28 Thu	86	—	unknown	01:10–06:20 (good, 5.17 h)	42.9° 04:25	10.37	24%	73.7°
2032-10-29 Fri	89	—	unknown	01:10–06:20 (good, 5.17 h)	42.9° 04:20	10.41	17%	84.5°
2032-10-30 Sat	89	—	unknown	01:05–05:20 (good, 5.25 h)	42.9° 03:20	10.45	10%	95.4°
2032-10-31 Sun	89	—	unknown	00:00–05:20 (good, 5.33 h)	42.9° 03:15	10.49	5%	106.3°
2032-11-01 Mon	89	—	unknown	23:55–05:25 (good, 5.5 h)	42.9° 03:10	10.52	2%	117.3°
2032-11-02 Tue	89	—	unknown	23:50–05:25 (good, 5.58 h)	42.9° 03:05	10.56	0%	128.2°
2032-11-03 Wed	89	—	unknown	23:50–05:25 (good, 5.58 h)	42.9° 03:05	10.59	0%	138.6°
2032-11-04 Thu	89	—	unknown	23:45–05:25 (good, 5.67 h)	42.9° 03:00	10.63	3%	147.9°
2032-11-05 Fri	89	—	unknown	23:40–05:25 (good, 5.75 h)	42.9° 02:55	10.66	8%	154.2°
2032-11-06 Sat	89	—	unknown	23:35–05:30 (good, 5.92 h)	42.9° 02:50	10.7	14%	155.1°
2032-11-07 Sun	89	—	unknown	23:35–05:30 (good, 5.92 h)	42.9° 02:45	10.73	23%	149.7°
2032-11-08 Mon	89	—	unknown	23:30–05:30 (good, 6.0 h)	42.9° 02:45	10.76	33%	140.3°
2032-11-09 Tue	89	—	unknown	23:25–05:30 (good, 6.08 h)	42.9° 02:40	10.79	44%	129.1°
2032-11-10 Wed	89	—	unknown	23:25–05:35 (good, 6.17 h)	42.9° 02:35	10.83	55%	116.9°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-10-23&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.