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: 09-25 (100), 09-26 (100), 09-27 (100), 09-28 (100), 09-29 (100) — by astronomy; check the weather when the night is within four days.

2032-09-23astronomy score per night — click a bar for that night2032-10-22

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-09-23 Thu	92	—	unknown	20:50–01:35 (good, 4.75 h)	89.5° 01:50	8.81	74%	48.4°
2032-09-24 Fri	98	—	unknown	20:50–05:15 (good, 8.42 h)	89.6° 01:50	8.86	65%	58.1°
2032-09-25 Sat	100	—	unknown	20:50–05:45 (good, 8.92 h)	89.7° 01:45	8.91	55%	68.2°
2032-09-26 Sun	100	—	unknown	20:45–05:45 (good, 9.0 h)	89.7° 01:40	8.96	45%	78.4°
2032-09-27 Mon	100	—	unknown	20:45–05:45 (good, 9.0 h)	89.6° 01:35	9.01	35%	88.6°
2032-09-28 Tue	100	—	unknown	20:40–05:45 (good, 9.08 h)	89.5° 01:35	9.06	26%	98.6°
2032-09-29 Wed	100	—	unknown	20:40–05:45 (good, 9.08 h)	89.6° 01:30	9.11	18%	108.5°
2032-09-30 Thu	100	—	unknown	20:40–05:50 (good, 9.17 h)	89.7° 01:25	9.16	12%	118.0°
2032-10-01 Fri	100	—	unknown	20:35–05:50 (good, 9.25 h)	89.7° 01:20	9.21	6%	127.0°
2032-10-02 Sat	100	—	unknown	20:35–05:50 (good, 9.25 h)	89.6° 01:15	9.25	2%	135.2°
2032-10-03 Sun	100	—	unknown	20:35–05:50 (good, 9.25 h)	89.5° 01:15	9.3	0%	141.9°
2032-10-04 Mon	100	—	unknown	20:30–05:55 (good, 9.42 h)	89.7° 01:10	9.35	0%	146.2°
2032-10-05 Tue	100	—	unknown	20:30–05:55 (good, 9.42 h)	89.8° 01:05	9.39	2%	146.8°
2032-10-06 Wed	100	—	unknown	20:30–05:55 (good, 9.42 h)	89.7° 01:00	9.44	5%	143.6°
2032-10-07 Thu	100	—	unknown	20:25–05:55 (good, 9.5 h)	89.5° 00:55	9.49	11%	137.2°
2032-10-08 Fri	100	—	unknown	20:25–05:55 (good, 9.5 h)	89.6° 00:55	9.53	18%	128.7°
2032-10-09 Sat	100	—	unknown	20:25–06:00 (good, 9.58 h)	89.7° 00:50	9.58	27%	118.8°
2032-10-10 Sun	100	—	unknown	20:20–06:00 (good, 9.67 h)	89.7° 00:45	9.62	37%	108.2°
2032-10-11 Mon	100	—	unknown	20:20–06:00 (good, 9.67 h)	89.6° 00:40	9.67	47%	96.9°
2032-10-12 Tue	100	—	unknown	20:20–06:00 (good, 9.67 h)	89.5° 00:40	9.71	59%	85.3°
2032-10-13 Wed	100	—	unknown	20:15–06:05 (good, 9.83 h)	89.6° 00:35	9.76	70%	73.5°
2032-10-14 Thu	99	—	unknown	21:15–06:05 (good, 8.83 h)	89.7° 00:30	9.8	80%	61.8°
2032-10-15 Fri	90	—	unknown	02:20–06:05 (good, 3.75 h)	89.7° 00:25	9.84	88%	50.7°
2032-10-16 Sat	81	—	unknown	05:45–06:05 (good, 0.33 h)	89.6° 00:20	9.89	95%	41.1°
2032-10-17 Sun	43	—	unknown	20:10–06:05 (marginal, 9.92 h)	89.5° 00:20	9.93	99%	34.6°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-09-23&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.