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: 01-23 (93), 02-06 (93), 02-07 (93), 02-08 (93), 02-09 (93) — by astronomy; check the weather when the night is within four days.

2032-01-23astronomy score per night — click a bar for that night2032-02-21

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-01-23 Fri	93	—	unknown	01:15–06:05 (good, 4.83 h)	50.2° 04:40	11.04	89%	101.9°
2032-01-24 Sat	91	—	unknown	02:00–06:05 (good, 4.08 h)	50.2° 04:35	11.01	94%	90.0°
2032-01-25 Sun	61	—	unknown	03:25–06:05 (good, 2.67 h)	50.2° 04:30	10.99	98%	78.2°
2032-01-26 Mon	46	—	unknown	05:30–06:05 (good, 0.58 h)	50.2° 04:30	10.96	100%	66.4°
2032-01-27 Tue	35	—	unknown	00:55–06:05 (marginal, 5.17 h)	50.2° 04:25	10.93	100%	54.8°
2032-01-28 Wed	26	—	unknown	01:25–06:05 (marginal, 4.67 h)	50.2° 04:20	10.9	98%	43.1°
2032-01-29 Thu	20	—	unknown	02:45–06:00 (marginal, 3.25 h)	50.2° 04:15	10.87	95%	31.6°
2032-01-30 Fri	22	—	unknown	00:45–06:00 (marginal, 5.25 h)	50.2° 04:10	10.84	90%	20.2°
2032-01-31 Sat	27	—	unknown	00:20–06:00 (marginal, 5.67 h)	50.2° 04:10	10.8	83%	10.3°
2032-02-01 Sun	35	—	unknown	00:00–06:00 (marginal, 6.0 h)	50.2° 04:05	10.77	76%	9.6°
2032-02-02 Mon	48	—	unknown	23:45–06:00 (marginal, 6.25 h)	50.2° 04:00	10.74	66%	19.6°
2032-02-03 Tue	80	—	unknown	00:10–05:15 (good, 5.08 h)	50.2° 03:55	10.71	57%	31.6°
2032-02-04 Wed	87	—	unknown	00:05–05:55 (good, 5.83 h)	50.2° 03:55	10.67	46%	44.3°
2032-02-05 Thu	92	—	unknown	00:00–05:55 (good, 5.92 h)	50.2° 03:50	10.64	36%	57.6°
2032-02-06 Fri	93	—	unknown	00:00–05:55 (good, 5.92 h)	50.2° 03:45	10.6	25%	71.4°
2032-02-07 Sat	93	—	unknown	23:55–05:55 (good, 6.0 h)	50.2° 03:40	10.57	16%	85.6°
2032-02-08 Sun	93	—	unknown	23:50–05:55 (good, 6.08 h)	50.2° 03:35	10.53	8%	100.3°
2032-02-09 Mon	93	—	unknown	23:45–05:50 (good, 6.08 h)	50.2° 03:35	10.49	3%	115.2°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-01-23&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.