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: 11-26 (100), 11-27 (100), 11-28 (100), 11-29 (100), 11-30 (100) — by astronomy; check the weather when the night is within four days.

2035-11-26astronomy score per night — click a bar for that night2035-12-25

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-11-26 Mon	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.7° 20:45	11.23	8%	142.1°
2035-11-27 Tue	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.8° 20:40	11.25	4%	138.9°
2035-11-28 Wed	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.7° 20:35	11.27	1%	133.1°
2035-11-29 Thu	100	—	unknown	18:35–02:40 (good, 8.08 h)	89.6° 20:30	11.29	0%	125.6°
2035-11-30 Fri	100	—	unknown	18:35–02:35 (good, 8.0 h)	89.5° 20:30	11.31	1%	117.2°
2035-12-01 Sat	100	—	unknown	18:35–02:35 (good, 8.0 h)	89.7° 20:25	11.33	4%	108.3°
2035-12-02 Sun	100	—	unknown	18:35–02:30 (good, 7.92 h)	89.8° 20:20	11.34	9%	99.0°
2035-12-03 Mon	100	—	unknown	18:35–02:25 (good, 7.83 h)	89.7° 20:15	11.36	15%	89.7°
2035-12-04 Tue	100	—	unknown	18:35–02:20 (good, 7.75 h)	89.5° 20:10	11.38	22%	80.4°
2035-12-05 Wed	100	—	unknown	18:35–02:15 (good, 7.67 h)	89.6° 20:10	11.39	30%	71.1°
2035-12-06 Thu	99	—	unknown	18:35–02:15 (good, 7.67 h)	89.7° 20:05	11.4	39%	62.2°
2035-12-07 Fri	92	—	unknown	18:35–02:10 (good, 7.58 h)	89.8° 20:00	11.42	49%	53.7°
2035-12-08 Sat	85	—	unknown	18:35–02:05 (good, 7.5 h)	89.6° 19:55	11.43	59%	46.2°
2035-12-09 Sun	65	—	unknown	22:05–00:00 (good, 1.92 h)	89.5° 19:55	11.44	69%	40.5°
2035-12-10 Mon	51	—	unknown	18:35–02:25 (marginal, 7.83 h)	89.7° 19:50	11.45	78%	37.7°
2035-12-11 Tue	40	—	unknown	18:35–02:05 (marginal, 7.5 h)	89.8° 19:45	11.46	87%	39.0°
2035-12-12 Wed	39	—	unknown	18:35–01:45 (marginal, 7.17 h)	89.7° 19:40	11.47	93%	44.4°
2035-12-13 Thu	45	—	unknown	18:35–01:35 (marginal, 7.0 h)	89.6° 19:35	11.48	98%	52.8°
2035-12-14 Fri	60	—	unknown	18:35–19:15 (good, 0.67 h)	89.5° 19:35	11.48	100%	63.2°
2035-12-15 Sat	73	—	unknown	18:35–21:55 (good, 3.33 h)	89.7° 19:30	11.49	99%	74.7°
2035-12-16 Sun	100	—	unknown	18:35–23:35 (good, 5.0 h)	89.8° 19:25	11.5	94%	86.6°
2035-12-17 Mon	100	—	unknown	18:35–01:00 (good, 6.42 h)	89.7° 19:20	11.5	88%	98.5°
2035-12-18 Tue	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.5° 19:15	11.5	79%	109.9°
2035-12-19 Wed	100	—	unknown	18:35–01:15 (good, 6.67 h)	89.6° 19:15	11.51	69%	120.4°
2035-12-20 Thu	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.7° 19:10	11.51	58%	129.5°
2035-12-21 Fri	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.8° 19:05	11.51	47%	136.7°
2035-12-22 Sat	100	—	unknown	18:35–01:10 (good, 6.58 h)	89.7° 19:00	11.51	37%	141.2°
2035-12-23 Sun	100	—	unknown	18:40–01:05 (good, 6.42 h)	89.5° 18:55	11.51	28%	142.2°
2035-12-24 Mon	100	—	unknown	18:40–01:00 (good, 6.33 h)	89.6° 18:55	11.5	19%	139.7°
2035-12-25 Tue	100	—	unknown	18:40–01:00 (good, 6.33 h)	89.8° 18:50	11.5	12%	134.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-11-26&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.