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: 11-22 (100), 11-23 (100), 11-24 (100), 11-25 (100), 11-26 (100) — by astronomy; check the weather when the night is within four days.

2032-11-17astronomy score per night — click a bar for that night2032-12-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-11-17 Wed	28	—	unknown	19:20–21:55 (marginal, 2.58 h)	72.6° 00:20	11.03	99%	8.4°
2032-11-18 Thu	36	—	unknown	19:00–23:30 (marginal, 4.5 h)	72.6° 00:15	11.06	97%	19.7°
2032-11-19 Fri	65	—	unknown	19:05–19:15 (good, 0.17 h)	72.6° 00:10	11.08	92%	32.5°
2032-11-20 Sat	85	—	unknown	19:00–22:00 (good, 3.0 h)	72.6° 00:10	11.11	85%	45.1°
2032-11-21 Sun	93	—	unknown	19:00–01:25 (good, 6.42 h)	72.6° 00:05	11.13	78%	57.5°
2032-11-22 Mon	100	—	unknown	18:55–03:35 (good, 8.67 h)	72.6° 00:00	11.16	69%	69.6°
2032-11-23 Tue	100	—	unknown	18:50–04:40 (good, 9.83 h)	72.6° 23:55	11.18	60%	81.6°
2032-11-24 Wed	100	—	unknown	18:45–04:50 (good, 10.08 h)	72.6° 23:50	11.2	50%	93.4°
2032-11-25 Thu	100	—	unknown	18:40–04:50 (good, 10.17 h)	72.6° 23:50	11.22	41%	105.1°
2032-11-26 Fri	100	—	unknown	18:40–04:50 (good, 10.17 h)	72.6° 23:45	11.25	32%	116.9°
2032-11-27 Sat	100	—	unknown	18:35–04:50 (good, 10.25 h)	72.6° 23:40	11.27	23%	128.7°
2032-11-28 Sun	100	—	unknown	18:35–04:45 (good, 10.17 h)	72.6° 23:35	11.29	16%	140.7°
2032-11-29 Mon	100	—	unknown	18:35–04:45 (good, 10.17 h)	72.6° 23:30	11.3	9%	152.9°
2032-11-30 Tue	100	—	unknown	18:35–04:40 (good, 10.08 h)	72.6° 23:30	11.32	4%	164.8°
2032-12-01 Wed	100	—	unknown	18:35–04:35 (good, 10.0 h)	72.6° 23:25	11.34	1%	173.3°
2032-12-02 Thu	100	—	unknown	18:35–04:30 (good, 9.92 h)	72.6° 23:20	11.36	0%	165.7°
2032-12-03 Fri	100	—	unknown	18:35–04:30 (good, 9.92 h)	72.6° 23:15	11.37	2%	152.9°
2032-12-04 Sat	100	—	unknown	18:35–04:25 (good, 9.83 h)	72.6° 23:15	11.39	5%	139.5°
2032-12-05 Sun	100	—	unknown	18:35–04:20 (good, 9.75 h)	72.6° 23:10	11.4	11%	125.7°
2032-12-06 Mon	100	—	unknown	18:35–04:15 (good, 9.67 h)	72.6° 23:05	11.41	20%	111.7°
2032-12-07 Tue	100	—	unknown	18:35–04:10 (good, 9.58 h)	72.6° 23:00	11.43	29%	97.7°
2032-12-08 Wed	100	—	unknown	18:35–04:10 (good, 9.58 h)	72.6° 22:55	11.44	40%	83.6°
2032-12-09 Thu	100	—	unknown	18:35–04:05 (good, 9.5 h)	72.6° 22:55	11.45	52%	69.6°
2032-12-10 Fri	96	—	unknown	19:40–04:00 (good, 8.33 h)	72.6° 22:50	11.46	63%	55.6°
2032-12-11 Sat	86	—	unknown	23:35–03:55 (good, 4.33 h)	72.6° 22:45	11.47	73%	41.7°
2032-12-12 Sun	67	—	unknown	03:40–03:50 (good, 0.17 h)	72.6° 22:40	11.48	82%	28.1°
2032-12-13 Mon	39	—	unknown	18:35–04:00 (marginal, 9.42 h)	72.6° 22:35	11.48	90%	15.1°
2032-12-14 Tue	27	—	unknown	00:25–03:40 (marginal, 3.25 h)	72.6° 22:35	11.49	96%	6.8°
2032-12-15 Wed	26	—	unknown	18:35–20:55 (marginal, 2.33 h)	72.6° 22:30	11.49	99%	15.2°
2032-12-16 Thu	29	—	unknown	18:35–21:40 (marginal, 3.08 h)	72.6° 22:25	11.5	100%	27.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-11-17&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.