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: 02-10 (93), 02-11 (93), 02-12 (93), 02-13 (93), 02-14 (93) — by astronomy; check the weather when the night is within four days.

2032-02-10astronomy score per night — click a bar for that night2032-03-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-02-10 Tue	93	—	unknown	23:40–05:50 (good, 6.17 h)	50.2° 03:30	10.46	0%	130.3°
2032-02-11 Wed	93	—	unknown	23:40–05:50 (good, 6.17 h)	50.2° 03:25	10.42	1%	145.2°
2032-02-12 Thu	93	—	unknown	23:35–05:50 (good, 6.25 h)	50.2° 03:20	10.38	4%	159.6°
2032-02-13 Fri	93	—	unknown	23:30–05:50 (good, 6.33 h)	50.2° 03:15	10.34	10%	171.1°
2032-02-14 Sat	93	—	unknown	23:25–05:45 (good, 6.33 h)	50.2° 03:15	10.3	18%	167.3°
2032-02-15 Sun	93	—	unknown	23:20–05:45 (good, 6.42 h)	50.2° 03:10	10.26	28%	154.9°
2032-02-16 Mon	93	—	unknown	23:20–05:45 (good, 6.42 h)	50.2° 03:05	10.22	38%	142.0°
2032-02-17 Tue	93	—	unknown	23:20–05:45 (good, 6.42 h)	50.2° 03:00	10.18	48%	129.4°
2032-02-18 Wed	93	—	unknown	23:20–05:40 (good, 6.33 h)	50.2° 03:00	10.14	58%	117.0°
2032-02-19 Thu	93	—	unknown	23:20–05:40 (good, 6.33 h)	50.2° 02:55	10.1	67%	104.9°
2032-02-20 Fri	92	—	unknown	23:30–05:40 (good, 6.17 h)	50.2° 02:50	10.06	76%	93.0°
2032-02-21 Sat	89	—	unknown	00:30–05:35 (good, 5.08 h)	50.2° 02:45	10.02	84%	81.2°
2032-02-22 Sun	86	—	unknown	02:10–05:35 (good, 3.42 h)	50.2° 02:40	9.98	90%	69.5°
2032-02-23 Mon	54	—	unknown	23:00–05:35 (marginal, 6.58 h)	50.2° 02:40	9.93	95%	57.8°
2032-02-24 Tue	39	—	unknown	23:15–05:35 (marginal, 6.33 h)	50.2° 02:35	9.89	98%	46.1°
2032-02-25 Wed	27	—	unknown	01:35–05:30 (marginal, 3.92 h)	50.2° 02:30	9.85	100%	34.5°
2032-02-26 Thu	23	—	unknown	02:25–05:30 (marginal, 3.08 h)	50.2° 02:25	9.8	100%	23.0°
2032-02-27 Fri	23	—	unknown	23:00–05:30 (marginal, 6.5 h)	50.2° 02:20	9.76	98%	12.3°
2032-02-28 Sat	26	—	unknown	22:30–05:25 (marginal, 6.92 h)	50.2° 02:20	9.71	94%	8.1°
2032-02-29 Sun	36	—	unknown	22:10–05:25 (marginal, 7.25 h)	50.2° 02:15	9.67	88%	16.9°
2032-03-01 Mon	66	—	unknown	22:25–22:40 (good, 0.25 h)	50.2° 02:10	9.62	81%	28.6°
2032-03-02 Tue	85	—	unknown	22:20–02:15 (good, 3.92 h)	50.2° 02:05	9.58	72%	41.1°
2032-03-03 Wed	90	—	unknown	22:15–04:45 (good, 6.5 h)	50.2° 02:05	9.53	62%	53.9°
2032-03-04 Thu	93	—	unknown	22:10–05:20 (good, 7.17 h)	50.2° 02:00	9.48	52%	67.2°
2032-03-05 Fri	93	—	unknown	22:10–05:20 (good, 7.17 h)	50.2° 01:55	9.44	40%	80.8°
2032-03-06 Sat	93	—	unknown	22:05–05:15 (good, 7.17 h)	50.2° 01:50	9.39	30%	94.8°
2032-03-07 Sun	93	—	unknown	22:00–05:15 (good, 7.25 h)	50.2° 01:45	9.34	20%	109.1°
2032-03-08 Mon	93	—	unknown	21:55–05:15 (good, 7.33 h)	50.2° 01:45	9.29	11%	123.7°
2032-03-09 Tue	93	—	unknown	21:50–05:10 (good, 7.33 h)	50.2° 01:40	9.25	5%	138.5°
2032-03-10 Wed	93	—	unknown	21:50–05:10 (good, 7.33 h)	50.2° 01:35	9.2	1%	153.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-10&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.