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: 10-22 (100), 10-23 (100), 10-24 (100), 10-25 (100), 10-26 (100) — by astronomy; check the weather when the night is within four days.

2032-10-18astronomy score per night — click a bar for that night2032-11-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-10-18 Mon	39	—	unknown	20:10–23:45 (marginal, 3.58 h)	89.7° 00:15	9.97	100%	33.1°
2032-10-19 Tue	49	—	unknown	20:10–06:00 (marginal, 9.83 h)	89.8° 00:10	10.01	98%	37.0°
2032-10-20 Wed	60	—	unknown	20:05–06:00 (marginal, 9.92 h)	89.7° 00:05	10.06	94%	44.6°
2032-10-21 Thu	95	—	unknown	20:05–23:15 (good, 3.17 h)	89.5° 00:00	10.1	88%	54.2°
2032-10-22 Fri	100	—	unknown	20:05–02:40 (good, 6.58 h)	89.6° 00:00	10.14	80%	64.4°
2032-10-23 Sat	100	—	unknown	20:05–04:20 (good, 8.25 h)	89.7° 23:55	10.18	71%	74.9°
2032-10-24 Sun	100	—	unknown	20:00–05:30 (good, 9.5 h)	89.7° 23:50	10.22	62%	85.3°
2032-10-25 Mon	100	—	unknown	20:00–05:35 (good, 9.58 h)	89.6° 23:45	10.26	52%	95.5°
2032-10-26 Tue	100	—	unknown	20:00–05:40 (good, 9.67 h)	89.5° 23:40	10.3	42%	105.5°
2032-10-27 Wed	100	—	unknown	20:00–05:40 (good, 9.67 h)	89.6° 23:40	10.34	33%	115.2°
2032-10-28 Thu	100	—	unknown	19:55–05:40 (good, 9.75 h)	89.7° 23:35	10.37	24%	124.4°
2032-10-29 Fri	100	—	unknown	19:55–05:40 (good, 9.75 h)	89.7° 23:30	10.41	17%	132.8°
2032-10-30 Sat	100	—	unknown	19:55–04:35 (good, 9.67 h)	89.6° 23:25	10.45	10%	140.1°
2032-10-31 Sun	100	—	unknown	18:55–04:30 (good, 9.58 h)	89.5° 22:25	10.49	5%	145.2°
2032-11-01 Mon	100	—	unknown	18:50–04:30 (good, 9.67 h)	89.7° 22:20	10.52	2%	147.1°
2032-11-02 Tue	100	—	unknown	18:50–04:25 (good, 9.58 h)	89.8° 22:15	10.56	0%	144.9°
2032-11-03 Wed	100	—	unknown	18:50–04:20 (good, 9.5 h)	89.7° 22:10	10.59	0%	139.1°
2032-11-04 Thu	100	—	unknown	18:50–04:15 (good, 9.42 h)	89.5° 22:05	10.63	3%	131.0°
2032-11-05 Fri	100	—	unknown	18:50–04:10 (good, 9.33 h)	89.6° 22:05	10.66	8%	121.3°
2032-11-06 Sat	100	—	unknown	18:45–04:10 (good, 9.42 h)	89.7° 22:00	10.7	14%	110.7°
2032-11-07 Sun	100	—	unknown	18:45–04:05 (good, 9.33 h)	89.7° 21:55	10.73	23%	99.5°
2032-11-08 Mon	100	—	unknown	18:45–04:00 (good, 9.25 h)	89.6° 21:50	10.76	33%	88.0°
2032-11-09 Tue	100	—	unknown	18:45–03:55 (good, 9.17 h)	89.5° 21:45	10.79	44%	76.4°
2032-11-10 Wed	100	—	unknown	18:45–03:50 (good, 9.08 h)	89.6° 21:45	10.83	55%	64.9°
2032-11-11 Thu	94	—	unknown	18:40–03:50 (good, 9.17 h)	89.7° 21:40	10.86	66%	54.0°
2032-11-12 Fri	85	—	unknown	23:35–03:45 (good, 4.17 h)	89.7° 21:35	10.89	77%	44.1°
2032-11-13 Sat	62	—	unknown	03:35–03:40 (good, 0.08 h)	89.6° 21:30	10.92	86%	36.5°
2032-11-14 Sun	39	—	unknown	18:40–03:50 (marginal, 9.17 h)	89.5° 21:30	10.95	93%	33.0°
2032-11-15 Mon	36	—	unknown	18:40–03:25 (marginal, 8.75 h)	89.7° 21:25	10.97	98%	34.8°
2032-11-16 Tue	44	—	unknown	18:40–03:05 (marginal, 8.42 h)	89.8° 21:20	11.0	100%	41.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-10-18&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.