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: 11-24 (100), 11-25 (100), 11-26 (100), 11-27 (100), 11-28 (100) — by astronomy; check the weather when the night is within four days.

2041-11-24astronomy score per night — click a bar for that night2041-12-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2041-11-24 Sun	100	—	unknown	18:35–03:00 (good, 8.42 h)	89.8° 20:50	11.2	2%	125.0°
2041-11-25 Mon	100	—	unknown	18:35–02:55 (good, 8.33 h)	89.8° 20:45	11.22	6%	114.8°
2041-11-26 Tue	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.6° 20:40	11.24	12%	103.8°
2041-11-27 Wed	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.6° 20:40	11.26	20%	92.5°
2041-11-28 Thu	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.7° 20:35	11.28	29%	81.0°
2041-11-29 Fri	100	—	unknown	18:35–02:40 (good, 8.08 h)	89.8° 20:30	11.3	40%	69.6°
2041-11-30 Sat	95	—	unknown	18:35–02:35 (good, 8.0 h)	89.7° 20:25	11.32	51%	58.5°
2041-12-01 Sun	86	—	unknown	18:35–02:30 (good, 7.92 h)	89.6° 20:20	11.34	62%	48.4°
2041-12-02 Mon	66	—	unknown	02:15–02:25 (good, 0.17 h)	89.6° 20:20	11.35	73%	40.0°
2041-12-03 Tue	45	—	unknown	18:35–02:45 (marginal, 8.17 h)	89.8° 20:15	11.37	83%	34.8°
2041-12-04 Wed	33	—	unknown	18:35–02:20 (marginal, 7.75 h)	89.8° 20:10	11.38	90%	34.3°
2041-12-05 Thu	31	—	unknown	18:35–01:50 (marginal, 7.25 h)	89.7° 20:05	11.4	96%	38.6°
2041-12-06 Fri	38	—	unknown	18:35–01:30 (marginal, 6.92 h)	89.5° 20:00	11.41	99%	46.3°
2041-12-07 Sat	52	—	unknown	18:35–01:45 (marginal, 7.17 h)	89.7° 20:00	11.42	100%	55.8°
2041-12-08 Sun	68	—	unknown	18:35–20:25 (good, 1.83 h)	89.8° 19:55	11.44	98%	66.1°
2041-12-09 Mon	77	—	unknown	18:35–22:55 (good, 4.33 h)	89.8° 19:50	11.45	94%	76.6°
2041-12-10 Tue	100	—	unknown	18:35–00:20 (good, 5.75 h)	89.6° 19:45	11.46	89%	87.2°
2041-12-11 Wed	100	—	unknown	18:35–01:25 (good, 6.83 h)	89.6° 19:45	11.47	82%	97.5°
2041-12-12 Thu	100	—	unknown	18:35–01:30 (good, 6.92 h)	89.7° 19:40	11.47	74%	107.5°
2041-12-13 Fri	100	—	unknown	18:35–01:35 (good, 7.0 h)	89.8° 19:35	11.48	65%	117.0°
2041-12-14 Sat	100	—	unknown	18:35–01:35 (good, 7.0 h)	89.7° 19:30	11.49	56%	126.0°
2041-12-15 Sun	100	—	unknown	18:35–01:30 (good, 6.92 h)	89.6° 19:25	11.49	47%	134.1°
2041-12-16 Mon	100	—	unknown	18:35–01:30 (good, 6.92 h)	89.6° 19:25	11.5	37%	140.7°
2041-12-17 Tue	100	—	unknown	18:35–01:30 (good, 6.92 h)	89.8° 19:20	11.5	28%	145.1°
2041-12-18 Wed	100	—	unknown	18:35–01:25 (good, 6.83 h)	89.8° 19:15	11.5	20%	146.0°
2041-12-19 Thu	100	—	unknown	18:35–01:20 (good, 6.75 h)	89.7° 19:10	11.51	13%	143.1°
2041-12-20 Fri	100	—	unknown	18:35–01:15 (good, 6.67 h)	89.5° 19:05	11.51	7%	136.9°
2041-12-21 Sat	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.7° 19:05	11.51	2%	128.4°
2041-12-22 Sun	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.8° 19:00	11.51	0%	118.3°
2041-12-23 Mon	100	—	unknown	18:40–01:05 (good, 6.42 h)	89.8° 18:55	11.51	1%	107.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2041-11-24&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.