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: 11-13 (100), 11-14 (100), 11-15 (100), 11-16 (100), 11-17 (100) — by astronomy; check the weather when the night is within four days.

2030-11-07astronomy score per night — click a bar for that night2030-12-06

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-11-07 Thu	35	—	unknown	23:10–04:15 (marginal, 5.08 h)	89.5° 21:55	10.71	95%	30.3°
2030-11-08 Fri	31	—	unknown	18:45–21:05 (marginal, 2.33 h)	89.6° 21:55	10.74	98%	30.7°
2030-11-09 Sat	37	—	unknown	18:45–22:05 (marginal, 3.33 h)	89.7° 21:50	10.78	100%	35.2°
2030-11-10 Sun	49	—	unknown	18:45–01:25 (marginal, 6.67 h)	89.7° 21:45	10.81	99%	42.4°
2030-11-11 Mon	63	—	unknown	18:45–19:30 (good, 0.75 h)	89.6° 21:40	10.84	97%	51.1°
2030-11-12 Tue	98	—	unknown	18:40–21:30 (good, 2.83 h)	89.5° 21:40	10.87	93%	60.5°
2030-11-13 Wed	100	—	unknown	18:40–00:20 (good, 5.67 h)	89.6° 21:35	10.9	88%	70.4°
2030-11-14 Thu	100	—	unknown	18:40–01:50 (good, 7.17 h)	89.7° 21:30	10.93	81%	80.5°
2030-11-15 Fri	100	—	unknown	18:40–03:05 (good, 8.42 h)	89.7° 21:25	10.96	73%	90.8°
2030-11-16 Sat	100	—	unknown	18:40–03:10 (good, 8.5 h)	89.6° 21:20	10.99	64%	101.3°
2030-11-17 Sun	100	—	unknown	18:40–03:15 (good, 8.58 h)	89.5° 21:20	11.02	54%	111.7°
2030-11-18 Mon	100	—	unknown	18:40–03:15 (good, 8.58 h)	89.7° 21:15	11.04	44%	122.1°
2030-11-19 Tue	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.7° 21:10	11.07	34%	132.2°
2030-11-20 Wed	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.7° 21:05	11.1	24%	141.3°
2030-11-21 Thu	100	—	unknown	18:35–03:10 (good, 8.58 h)	89.5° 21:00	11.12	16%	148.0°
2030-11-22 Fri	100	—	unknown	18:35–03:05 (good, 8.5 h)	89.6° 21:00	11.14	8%	150.0°
2030-11-23 Sat	100	—	unknown	18:35–03:05 (good, 8.5 h)	89.7° 20:55	11.17	3%	146.0°
2030-11-24 Sun	100	—	unknown	18:35–03:00 (good, 8.42 h)	89.7° 20:50	11.19	0%	137.2°
2030-11-25 Mon	100	—	unknown	18:35–02:55 (good, 8.33 h)	89.6° 20:45	11.21	1%	126.0°
2030-11-26 Tue	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.5° 20:45	11.24	4%	113.6°
2030-11-27 Wed	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.6° 20:40	11.26	10%	100.7°
2030-11-28 Thu	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.7° 20:35	11.28	18%	88.0°
2030-11-29 Fri	100	—	unknown	18:35–02:40 (good, 8.08 h)	89.7° 20:30	11.3	28%	75.6°
2030-11-30 Sat	100	—	unknown	18:35–02:35 (good, 8.0 h)	89.6° 20:25	11.31	39%	63.9°
2030-12-01 Sun	93	—	unknown	18:35–02:30 (good, 7.92 h)	89.5° 20:25	11.33	50%	53.0°
2030-12-02 Mon	85	—	unknown	18:35–02:30 (good, 7.92 h)	89.7° 20:20	11.35	60%	43.3°
2030-12-03 Tue	70	—	unknown	02:05–02:25 (good, 0.33 h)	89.7° 20:15	11.36	70%	35.6°
2030-12-04 Wed	47	—	unknown	18:35–02:45 (marginal, 8.17 h)	89.7° 20:10	11.38	78%	30.8°
2030-12-05 Thu	33	—	unknown	18:35–02:25 (marginal, 7.83 h)	89.5° 20:05	11.39	86%	30.2°
2030-12-06 Fri	29	—	unknown	18:35–02:00 (marginal, 7.42 h)	89.6° 20:05	11.41	92%	33.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-11-07&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.