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 3C 273: 12-27 (69), 12-12 (58), 12-13 (58), 12-14 (58), 12-26 (58) — by astronomy; check the weather when the night is within four days.

2032-11-28astronomy score per night — click a bar for that night2032-12-27

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-11-28 Sun	29	—	unknown	04:35–05:50 (good, 1.25 h)	50.2° 08:15	11.29	16%	15.8°
2032-11-29 Mon	33	—	unknown	04:25–05:50 (good, 1.42 h)	50.2° 08:15	11.3	9%	27.5°
2032-11-30 Tue	37	—	unknown	04:20–05:50 (good, 1.5 h)	50.2° 08:10	11.32	4%	39.9°
2032-12-01 Wed	39	—	unknown	04:20–05:55 (good, 1.58 h)	50.2° 08:05	11.34	1%	52.7°
2032-12-02 Thu	41	—	unknown	04:15–05:55 (good, 1.67 h)	50.2° 08:00	11.36	0%	65.9°
2032-12-03 Fri	43	—	unknown	04:10–05:55 (good, 1.75 h)	50.2° 07:55	11.37	2%	79.4°
2032-12-04 Sat	44	—	unknown	04:05–05:55 (good, 1.83 h)	50.2° 07:55	11.39	5%	93.1°
2032-12-05 Sun	46	—	unknown	04:05–05:55 (good, 1.83 h)	50.2° 07:50	11.4	11%	107.0°
2032-12-06 Mon	47	—	unknown	04:00–05:55 (good, 1.92 h)	50.2° 07:45	11.41	20%	120.9°
2032-12-07 Tue	50	—	unknown	03:55–06:00 (good, 2.08 h)	50.2° 07:40	11.43	29%	134.9°
2032-12-08 Wed	52	—	unknown	03:50–06:00 (good, 2.17 h)	50.2° 07:40	11.44	40%	148.8°
2032-12-09 Thu	54	—	unknown	03:45–06:00 (good, 2.25 h)	50.2° 07:35	11.45	52%	162.3°
2032-12-10 Fri	55	—	unknown	03:45–06:00 (good, 2.25 h)	50.2° 07:30	11.46	63%	172.8°
2032-12-11 Sat	57	—	unknown	03:40–06:00 (good, 2.33 h)	50.2° 07:25	11.47	73%	166.4°
2032-12-12 Sun	58	—	unknown	03:40–06:00 (good, 2.33 h)	50.2° 07:20	11.48	82%	153.5°
2032-12-13 Mon	58	—	unknown	03:40–06:05 (good, 2.42 h)	50.2° 07:20	11.48	90%	140.0°
2032-12-14 Tue	58	—	unknown	03:40–06:05 (good, 2.42 h)	50.2° 07:15	11.49	96%	126.5°
2032-12-15 Wed	49	—	unknown	03:40–06:05 (good, 2.42 h)	50.2° 07:10	11.49	99%	113.1°
2032-12-16 Thu	41	—	unknown	03:50–06:05 (good, 2.25 h)	50.2° 07:05	11.5	100%	99.9°
2032-12-17 Fri	34	—	unknown	05:00–06:05 (good, 1.08 h)	50.2° 07:00	11.5	99%	87.0°
2032-12-18 Sat	27	—	unknown	03:00–06:05 (marginal, 3.08 h)	50.2° 07:00	11.5	95%	74.4°
2032-12-19 Sun	22	—	unknown	03:05–06:05 (marginal, 3.0 h)	50.2° 06:55	11.51	90%	62.0°
2032-12-20 Mon	19	—	unknown	03:05–06:05 (marginal, 3.0 h)	50.2° 06:50	11.51	84%	49.9°
2032-12-21 Tue	19	—	unknown	03:00–06:05 (marginal, 3.08 h)	50.2° 06:45	11.51	76%	38.1°
2032-12-22 Wed	21	—	unknown	02:50–06:10 (marginal, 3.33 h)	50.2° 06:45	11.51	68%	26.5°
2032-12-23 Thu	28	—	unknown	02:30–06:10 (marginal, 3.67 h)	50.2° 06:40	11.5	59%	15.3°
2032-12-24 Fri	37	—	unknown	04:30–06:10 (good, 1.67 h)	50.2° 06:35	11.5	49%	7.0°
2032-12-25 Sat	47	—	unknown	03:05–06:10 (good, 3.08 h)	50.2° 06:30	11.5	40%	12.0°
2032-12-26 Sun	58	—	unknown	02:55–06:10 (good, 3.25 h)	50.2° 06:25	11.49	31%	23.1°
2032-12-27 Mon	69	—	unknown	02:35–06:10 (good, 3.58 h)	50.2° 06:25	11.49	22%	35.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-11-28&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.