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: 03-31 (93), 04-01 (93), 04-02 (93), 04-03 (93), 04-04 (93) — by astronomy; check the weather when the night is within four days.

2032-03-28astronomy score per night — click a bar for that night2032-04-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-03-28 Sun	43	—	unknown	21:20–05:05 (marginal, 7.75 h)	50.2° 01:25	8.27	96%	25.6°
2032-03-29 Mon	83	—	unknown	21:35–22:35 (good, 1.0 h)	50.2° 01:20	8.22	92%	38.0°
2032-03-30 Tue	89	—	unknown	21:30–01:35 (good, 4.08 h)	50.2° 01:15	8.16	85%	50.9°
2032-03-31 Wed	93	—	unknown	21:25–03:40 (good, 6.25 h)	50.2° 01:10	8.11	76%	64.0°
2032-04-01 Thu	93	—	unknown	21:25–04:35 (good, 7.17 h)	50.2° 01:10	8.05	66%	77.4°
2032-04-02 Fri	93	—	unknown	21:25–04:45 (good, 7.33 h)	50.2° 01:05	8.0	56%	91.1°
2032-04-03 Sat	93	—	unknown	21:30–04:45 (good, 7.25 h)	50.2° 01:00	7.94	44%	104.9°
2032-04-04 Sun	93	—	unknown	21:30–04:45 (good, 7.25 h)	50.2° 00:55	7.89	33%	119.0°
2032-04-05 Mon	93	—	unknown	21:30–04:45 (good, 7.25 h)	50.2° 00:55	7.83	23%	133.2°
2032-04-06 Tue	93	—	unknown	21:30–04:40 (good, 7.17 h)	50.2° 00:50	7.77	14%	147.4°
2032-04-07 Wed	93	—	unknown	21:35–04:35 (good, 7.0 h)	50.2° 00:45	7.72	6%	161.3°
2032-04-08 Thu	93	—	unknown	21:35–04:35 (good, 7.0 h)	50.2° 00:40	7.66	2%	171.9°
2032-04-09 Fri	93	—	unknown	21:35–04:30 (good, 6.92 h)	50.2° 00:35	7.61	0%	166.0°
2032-04-10 Sat	93	—	unknown	21:40–04:25 (good, 6.75 h)	50.2° 00:35	7.55	1%	153.0°
2032-04-11 Sun	93	—	unknown	21:40–04:20 (good, 6.67 h)	50.2° 00:30	7.49	4%	139.6°
2032-04-12 Mon	93	—	unknown	21:40–04:15 (good, 6.58 h)	50.2° 00:25	7.43	10%	126.4°
2032-04-13 Tue	93	—	unknown	21:40–04:15 (good, 6.58 h)	50.2° 00:20	7.38	16%	113.5°
2032-04-14 Wed	93	—	unknown	21:45–04:10 (good, 6.42 h)	50.2° 00:15	7.32	25%	101.0°
2032-04-15 Thu	92	—	unknown	21:45–04:05 (good, 6.33 h)	50.2° 00:15	7.26	34%	88.7°
2032-04-16 Fri	89	—	unknown	21:45–04:00 (good, 6.25 h)	50.2° 00:10	7.2	43%	76.8°
2032-04-17 Sat	85	—	unknown	21:50–04:00 (good, 6.17 h)	50.2° 00:05	7.15	53%	65.0°
2032-04-18 Sun	81	—	unknown	22:45–03:55 (good, 5.17 h)	50.2° 00:00	7.09	62%	53.3°
2032-04-19 Mon	60	—	unknown	03:40–03:50 (good, 0.17 h)	50.2° 00:00	7.03	71%	41.6°
2032-04-20 Tue	37	—	unknown	21:55–04:15 (marginal, 6.33 h)	50.2° 23:55	6.97	79%	30.0°
2032-04-21 Wed	29	—	unknown	21:55–03:55 (marginal, 6.0 h)	50.2° 23:50	6.91	86%	18.7°
2032-04-22 Thu	23	—	unknown	21:55–03:45 (marginal, 5.83 h)	50.2° 23:45	6.86	92%	9.1°
2032-04-23 Fri	20	—	unknown	22:00–03:30 (marginal, 5.5 h)	50.2° 23:40	6.8	97%	10.9°
2032-04-24 Sat	21	—	unknown	22:00–03:15 (marginal, 5.25 h)	50.2° 23:40	6.74	100%	21.8°
2032-04-25 Sun	27	—	unknown	22:00–03:10 (marginal, 5.17 h)	50.2° 23:35	6.68	100%	34.3°
2032-04-26 Mon	42	—	unknown	22:00–03:25 (marginal, 5.42 h)	50.2° 23:30	6.62	98%	47.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-03-28&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.