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: 01-02 (100), 01-03 (100), 01-04 (100), 01-05 (100), 01-06 (100) — by astronomy; check the weather when the night is within four days.

2032-01-02astronomy score per night — click a bar for that night2032-01-31

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-01-02 Fri	100	—	unknown	18:45–00:15 (good, 5.5 h)	89.6° 18:20	11.44	77%	126.2°
2032-01-03 Sat	100	—	unknown	18:45–00:15 (good, 5.5 h)	89.7° 18:15	11.43	69%	134.8°
2032-01-04 Sun	100	—	unknown	18:45–00:15 (good, 5.5 h)	89.7° 18:10	11.42	60%	142.2°
2032-01-05 Mon	100	—	unknown	18:45–00:15 (good, 5.5 h)	89.7° 18:05	11.41	50%	147.2°
2032-01-06 Tue	100	—	unknown	18:45–00:10 (good, 5.42 h)	89.5° 18:00	11.39	40%	148.3°
2032-01-07 Wed	100	—	unknown	18:50–00:05 (good, 5.25 h)	89.6° 18:00	11.38	30%	144.9°
2032-01-08 Thu	100	—	unknown	18:50–00:05 (good, 5.25 h)	89.7° 17:55	11.36	20%	137.6°
2032-01-09 Fri	100	—	unknown	18:50–00:00 (good, 5.17 h)	89.7° 17:50	11.35	12%	127.7°
2032-01-10 Sat	100	—	unknown	18:50–23:55 (good, 5.08 h)	89.6° 17:45	11.33	5%	116.2°
2032-01-11 Sun	100	—	unknown	18:50–23:50 (good, 5.0 h)	89.5° 17:45	11.31	1%	103.8°
2032-01-12 Mon	100	—	unknown	18:55–23:45 (good, 4.83 h)	89.7° 17:40	11.3	0%	90.9°
2032-01-13 Tue	100	—	unknown	18:55–23:45 (good, 4.83 h)	89.7° 17:35	11.28	2%	77.9°
2032-01-14 Wed	100	—	unknown	18:55–23:40 (good, 4.75 h)	89.7° 17:30	11.26	7%	65.3°
2032-01-15 Thu	95	—	unknown	18:55–23:35 (good, 4.67 h)	89.6° 17:25	11.23	14%	53.5°
2032-01-16 Fri	89	—	unknown	18:55–23:30 (good, 4.58 h)	89.6° 17:25	11.21	23%	43.3°
2032-01-17 Sat	79	—	unknown	19:00–23:30 (good, 4.5 h)	89.7° 17:20	11.19	33%	35.5°
2032-01-18 Sun	59	—	unknown	19:00–23:00 (good, 4.0 h)	89.7° 17:15	11.17	44%	31.8°
2032-01-19 Mon	45	—	unknown	19:00–20:25 (good, 1.42 h)	89.7° 17:10	11.14	55%	33.0°
2032-01-20 Tue	35	—	unknown	19:00–23:40 (marginal, 4.67 h)	89.5° 17:05	11.12	65%	38.2°
2032-01-21 Wed	30	—	unknown	19:00–23:25 (marginal, 4.42 h)	89.6° 17:05	11.09	74%	45.8°
2032-01-22 Thu	29	—	unknown	19:05–23:15 (marginal, 4.17 h)	89.7° 17:00	11.07	82%	54.8°
2032-01-23 Fri	32	—	unknown	19:05–23:10 (marginal, 4.08 h)	89.7° 16:55	11.04	89%	64.4°
2032-01-24 Sat	37	—	unknown	19:05–19:40 (good, 0.58 h)	89.6° 16:50	11.01	94%	74.3°
2032-01-25 Sun	45	—	unknown	19:05–20:35 (good, 1.5 h)	89.5° 16:50	10.99	98%	84.4°
2032-01-26 Mon	54	—	unknown	19:05–21:30 (good, 2.42 h)	89.7° 16:45	10.96	100%	94.5°
2032-01-27 Tue	64	—	unknown	19:10–22:20 (good, 3.17 h)	89.7° 16:40	10.93	100%	104.5°
2032-01-28 Wed	74	—	unknown	19:10–22:25 (good, 3.25 h)	89.7° 16:35	10.9	98%	114.3°
2032-01-29 Thu	85	—	unknown	19:10–22:30 (good, 3.33 h)	89.6° 16:30	10.87	95%	123.8°
2032-01-30 Fri	86	—	unknown	19:10–22:25 (good, 3.25 h)	89.5° 16:30	10.84	90%	132.6°
2032-01-31 Sat	85	—	unknown	19:15–22:25 (good, 3.17 h)	89.7° 16:25	10.8	83%	140.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-02&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.