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: 12-31 (100), 01-01 (100), 01-02 (100), 01-03 (100), 01-17 (100) — by astronomy; check the weather when the night is within four days.

2032-12-31astronomy score per night — click a bar for that night2033-01-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2033-01-11 Tue	32	—	unknown	18:55–23:50 (marginal, 4.92 h)	89.8° 17:40	11.3	87%	53.7°
2033-01-12 Wed	37	—	unknown	18:55–23:45 (marginal, 4.83 h)	89.7° 17:35	11.28	93%	63.7°
2033-01-13 Thu	46	—	unknown	18:55–19:55 (good, 1.0 h)	89.6° 17:30	11.26	97%	74.1°
2033-01-14 Fri	57	—	unknown	18:55–21:10 (good, 2.25 h)	89.5° 17:30	11.24	99%	84.6°
2033-01-15 Sat	70	—	unknown	18:55–22:15 (good, 3.33 h)	89.7° 17:25	11.22	100%	95.0°
2033-01-16 Sun	84	—	unknown	18:55–23:00 (good, 4.08 h)	89.8° 17:20	11.2	98%	105.2°
2033-01-17 Mon	100	—	unknown	19:00–23:10 (good, 4.17 h)	89.7° 17:15	11.17	94%	115.0°
2033-01-18 Tue	100	—	unknown	19:00–23:10 (good, 4.17 h)	89.5° 17:10	11.15	89%	124.2°
2033-01-19 Wed	100	—	unknown	19:00–23:10 (good, 4.17 h)	89.6° 17:10	11.12	83%	132.6°
2033-01-20 Thu	100	—	unknown	19:00–23:05 (good, 4.08 h)	89.7° 17:05	11.1	75%	139.7°
2033-01-21 Fri	100	—	unknown	19:05–23:10 (good, 4.08 h)	89.7° 17:00	11.07	67%	144.7°
2033-01-22 Sat	100	—	unknown	19:05–23:05 (good, 4.0 h)	89.6° 16:55	11.05	58%	146.6°
2033-01-23 Sun	100	—	unknown	19:05–23:00 (good, 3.92 h)	89.5° 16:55	11.02	48%	144.7°
2033-01-24 Mon	100	—	unknown	19:05–22:55 (good, 3.83 h)	89.6° 16:50	10.99	38%	139.5°
2033-01-25 Tue	99	—	unknown	19:05–22:55 (good, 3.83 h)	89.8° 16:45	10.96	29%	131.7°
2033-01-26 Wed	97	—	unknown	19:10–22:50 (good, 3.67 h)	89.7° 16:40	10.93	20%	122.3°
2033-01-27 Thu	95	—	unknown	19:10–22:45 (good, 3.58 h)	89.6° 16:35	10.91	12%	111.6°
2033-01-28 Fri	93	—	unknown	19:10–22:40 (good, 3.5 h)	89.5° 16:35	10.87	6%	100.1°
2033-01-29 Sat	90	—	unknown	19:10–22:40 (good, 3.5 h)	89.7° 16:30	10.84	2%	88.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-31&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.