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 Seven Sisters: 11-12 (100), 11-13 (100), 11-14 (100), 11-15 (100), 11-16 (100) — by astronomy; check the weather when the night is within four days.

2036-11-12astronomy score per night — click a bar for that night2036-12-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-11-12 Wed	100	—	unknown	19:35–05:35 (good, 10.0 h)	72.5° 00:40	10.89	29%	105.4°
2036-11-13 Thu	100	—	unknown	19:30–05:35 (good, 10.08 h)	72.5° 00:35	10.92	20%	119.3°
2036-11-14 Fri	100	—	unknown	19:25–05:35 (good, 10.17 h)	72.5° 00:30	10.95	12%	133.1°
2036-11-15 Sat	100	—	unknown	19:20–05:40 (good, 10.33 h)	72.5° 00:25	10.98	5%	146.6°
2036-11-16 Sun	100	—	unknown	19:15–05:35 (good, 10.33 h)	72.5° 00:25	11.0	2%	159.5°
2036-11-17 Mon	100	—	unknown	19:15–05:30 (good, 10.25 h)	72.5° 00:20	11.03	0%	169.8°
2036-11-18 Tue	100	—	unknown	19:10–05:25 (good, 10.25 h)	72.5° 00:15	11.06	1%	167.9°
2036-11-19 Wed	100	—	unknown	19:05–05:20 (good, 10.25 h)	72.5° 00:10	11.08	4%	157.0°
2036-11-20 Thu	100	—	unknown	19:00–05:20 (good, 10.33 h)	72.5° 00:10	11.11	9%	145.0°
2036-11-21 Fri	100	—	unknown	19:00–05:15 (good, 10.25 h)	72.5° 00:05	11.13	15%	133.0°
2036-11-22 Sat	100	—	unknown	18:55–05:10 (good, 10.25 h)	72.5° 00:00	11.16	23%	121.1°
2036-11-23 Sun	100	—	unknown	18:55–05:05 (good, 10.17 h)	72.5° 23:55	11.18	32%	109.3°
2036-11-24 Mon	100	—	unknown	18:55–05:05 (good, 10.17 h)	72.5° 23:50	11.2	40%	97.5°
2036-11-25 Tue	100	—	unknown	18:55–05:00 (good, 10.08 h)	72.5° 23:50	11.23	50%	85.9°
2036-11-26 Wed	100	—	unknown	19:05–04:55 (good, 9.83 h)	72.5° 23:45	11.25	59%	74.1°
2036-11-27 Thu	100	—	unknown	20:15–04:50 (good, 8.58 h)	72.5° 23:40	11.27	68%	62.2°
2036-11-28 Fri	93	—	unknown	23:00–04:45 (good, 5.75 h)	72.5° 23:35	11.29	77%	50.2°
2036-11-29 Sat	85	—	unknown	03:35–04:45 (good, 1.17 h)	72.5° 23:30	11.31	85%	38.0°
2036-11-30 Sun	58	—	unknown	18:35–05:05 (marginal, 10.5 h)	72.5° 23:30	11.32	92%	25.7°
2036-12-01 Mon	35	—	unknown	00:20–04:40 (marginal, 4.33 h)	72.5° 23:25	11.34	96%	14.0°
2036-12-02 Tue	28	—	unknown	18:35–21:05 (marginal, 2.5 h)	72.5° 23:20	11.36	99%	9.3°
2036-12-03 Wed	30	—	unknown	18:35–21:55 (marginal, 3.33 h)	72.5° 23:15	11.37	100%	18.8°
2036-12-04 Thu	40	—	unknown	18:35–23:25 (marginal, 4.83 h)	72.5° 23:15	11.39	98%	32.0°
2036-12-05 Fri	84	—	unknown	18:35–19:05 (good, 0.5 h)	72.5° 23:10	11.4	93%	45.9°
2036-12-06 Sat	92	—	unknown	18:35–23:35 (good, 5.0 h)	72.5° 23:05	11.41	86%	60.0°
2036-12-07 Sun	100	—	unknown	18:35–02:20 (good, 7.75 h)	72.5° 23:00	11.43	77%	74.2°
2036-12-08 Mon	100	—	unknown	18:35–03:45 (good, 9.17 h)	72.5° 22:55	11.44	66%	88.4°
2036-12-09 Tue	100	—	unknown	18:35–03:50 (good, 9.25 h)	72.5° 22:55	11.45	55%	102.4°
2036-12-10 Wed	100	—	unknown	18:35–03:55 (good, 9.33 h)	72.5° 22:50	11.46	44%	116.2°
2036-12-11 Thu	100	—	unknown	18:35–03:55 (good, 9.33 h)	72.5° 22:45	11.47	33%	129.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-11-12&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.