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: 10-06 (100), 10-07 (100), 10-08 (100), 10-09 (100), 10-20 (100) — by astronomy; check the weather when the night is within four days.

2046-10-06astronomy score per night — click a bar for that night2046-11-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-10-06 Sat	100	—	unknown	20:30–05:55 (good, 9.42 h)	89.7° 01:05	9.42	51%	101.9°
2046-10-07 Sun	100	—	unknown	20:25–05:55 (good, 9.5 h)	89.8° 01:00	9.47	61%	90.8°
2046-10-08 Mon	100	—	unknown	20:25–05:55 (good, 9.5 h)	89.8° 00:55	9.52	70%	79.9°
2046-10-09 Tue	100	—	unknown	20:25–06:00 (good, 9.58 h)	89.6° 00:50	9.56	78%	69.4°
2046-10-10 Wed	97	—	unknown	23:55–06:00 (good, 6.08 h)	89.5° 00:50	9.61	86%	59.2°
2046-10-11 Thu	89	—	unknown	03:10–06:00 (good, 2.83 h)	89.7° 00:45	9.65	92%	49.6°
2046-10-12 Fri	82	—	unknown	05:55–06:00 (good, 0.08 h)	89.8° 00:40	9.7	96%	40.8°
2046-10-13 Sat	42	—	unknown	20:20–06:00 (marginal, 9.67 h)	89.8° 00:35	9.74	99%	33.6°
2046-10-14 Sun	32	—	unknown	03:15–06:05 (marginal, 2.83 h)	89.6° 00:30	9.78	100%	29.1°
2046-10-15 Mon	35	—	unknown	20:15–23:15 (marginal, 3.0 h)	89.6° 00:30	9.83	99%	28.8°
2046-10-16 Tue	43	—	unknown	20:15–00:40 (marginal, 4.42 h)	89.8° 00:25	9.87	96%	32.7°
2046-10-17 Wed	56	—	unknown	20:10–06:05 (marginal, 9.92 h)	89.8° 00:20	9.91	92%	39.7°
2046-10-18 Thu	91	—	unknown	20:10–22:40 (good, 2.5 h)	89.7° 00:15	9.96	86%	48.7°
2046-10-19 Fri	96	—	unknown	20:10–01:30 (good, 5.33 h)	89.5° 00:10	10.0	78%	58.7°
2046-10-20 Sat	100	—	unknown	20:05–04:10 (good, 8.08 h)	89.7° 00:10	10.04	70%	69.5°
2046-10-21 Sun	100	—	unknown	20:05–05:40 (good, 9.58 h)	89.8° 00:05	10.08	60%	80.7°
2046-10-22 Mon	100	—	unknown	20:05–05:50 (good, 9.75 h)	89.8° 00:00	10.12	49%	92.4°
2046-10-23 Tue	100	—	unknown	20:05–05:55 (good, 9.83 h)	89.7° 23:55	10.16	38%	104.4°
2046-10-24 Wed	100	—	unknown	20:00–06:00 (good, 10.0 h)	89.5° 23:55	10.2	28%	116.5°
2046-10-25 Thu	100	—	unknown	20:00–05:55 (good, 9.92 h)	89.7° 23:50	10.24	18%	128.4°
2046-10-26 Fri	100	—	unknown	20:00–05:55 (good, 9.92 h)	89.8° 23:45	10.28	10%	139.5°
2046-10-27 Sat	100	—	unknown	20:00–04:50 (good, 9.83 h)	89.8° 23:40	10.32	4%	148.1°
2046-10-28 Sun	100	—	unknown	18:55–04:45 (good, 9.83 h)	89.6° 22:35	10.36	1%	151.6°
2046-10-29 Mon	100	—	unknown	18:55–04:40 (good, 9.75 h)	89.6° 22:35	10.4	0%	148.2°
2046-10-30 Tue	100	—	unknown	18:55–04:40 (good, 9.75 h)	89.8° 22:30	10.43	3%	139.8°
2046-10-31 Wed	100	—	unknown	18:55–04:35 (good, 9.67 h)	89.8° 22:25	10.47	8%	129.0°
2046-11-01 Thu	100	—	unknown	18:50–04:30 (good, 9.67 h)	89.7° 22:20	10.51	16%	117.4°
2046-11-02 Fri	100	—	unknown	18:50–04:25 (good, 9.58 h)	89.5° 22:15	10.54	25%	105.7°
2046-11-03 Sat	100	—	unknown	18:50–04:20 (good, 9.5 h)	89.6° 22:15	10.58	34%	94.2°
2046-11-04 Sun	100	—	unknown	18:50–04:20 (good, 9.5 h)	89.8° 22:10	10.61	44%	83.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-10-06&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.