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: 12-18 (100), 12-19 (100), 12-20 (100), 12-21 (100), 12-22 (100) — by astronomy; check the weather when the night is within four days.

2032-12-12astronomy score per night — click a bar for that night2033-01-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-12-20 Mon	100	—	unknown	18:35–00:55 (good, 6.33 h)	89.7° 19:05	11.51	84%	108.5°
2032-12-21 Tue	100	—	unknown	18:35–01:00 (good, 6.42 h)	89.5° 19:00	11.51	76%	118.1°
2032-12-22 Wed	100	—	unknown	18:35–01:00 (good, 6.42 h)	89.6° 19:00	11.51	68%	127.1°
2032-12-23 Thu	100	—	unknown	18:40–00:55 (good, 6.25 h)	89.7° 18:55	11.5	59%	135.2°
2032-12-24 Fri	100	—	unknown	18:40–00:55 (good, 6.25 h)	89.7° 18:50	11.5	49%	141.8°
2032-12-25 Sat	100	—	unknown	18:40–00:55 (good, 6.25 h)	89.6° 18:45	11.5	40%	145.9°
2032-12-26 Sun	100	—	unknown	18:40–00:50 (good, 6.17 h)	89.5° 18:45	11.49	31%	146.6°
2032-12-27 Mon	100	—	unknown	18:40–00:45 (good, 6.08 h)	89.7° 18:40	11.49	22%	143.4°
2032-12-28 Tue	100	—	unknown	18:40–00:45 (good, 6.08 h)	89.8° 18:35	11.48	14%	136.9°
2032-12-29 Wed	100	—	unknown	18:40–00:40 (good, 6.0 h)	89.7° 18:30	11.47	8%	128.2°
2032-12-30 Thu	100	—	unknown	18:40–00:35 (good, 5.92 h)	89.6° 18:25	11.47	3%	118.0°
2032-12-31 Fri	100	—	unknown	18:45–00:30 (good, 5.75 h)	89.6° 18:25	11.46	0%	106.8°
2033-01-01 Sat	100	—	unknown	18:45–00:30 (good, 5.75 h)	89.7° 18:20	11.45	0%	95.0°
2033-01-02 Sun	100	—	unknown	18:45–00:25 (good, 5.67 h)	89.8° 18:15	11.44	3%	82.9°
2033-01-03 Mon	100	—	unknown	18:45–00:20 (good, 5.58 h)	89.7° 18:10	11.42	9%	70.9°
2033-01-04 Tue	99	—	unknown	18:45–00:15 (good, 5.5 h)	89.5° 18:05	11.41	16%	59.3°
2033-01-05 Wed	90	—	unknown	18:45–00:10 (good, 5.42 h)	89.6° 18:05	11.4	26%	48.7°
2033-01-06 Thu	82	—	unknown	18:50–00:10 (good, 5.33 h)	89.7° 18:00	11.38	36%	40.0°
2033-01-07 Fri	69	—	unknown	18:50–23:40 (good, 4.83 h)	89.7° 17:55	11.37	48%	34.4°
2033-01-08 Sat	50	—	unknown	18:50–00:30 (marginal, 5.67 h)	89.6° 17:50	11.35	59%	33.6°
2033-01-09 Sun	37	—	unknown	18:50–00:15 (marginal, 5.42 h)	89.5° 17:50	11.34	69%	37.4°
2033-01-10 Mon	32	—	unknown	18:50–00:00 (marginal, 5.17 h)	89.7° 17:45	11.32	79%	44.6°

Download: CSV · JSON

💡 API

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