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 Vega: 03-10 (89), 03-11 (89), 03-09 (87), 03-08 (85), 03-07 (78) — by astronomy; check the weather when the night is within four days.

2032-02-11astronomy score per night — click a bar for that night2032-03-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-02-11 Wed	55	—	unknown	03:35–05:50 (good, 2.25 h)	87.1° 09:30	10.42	1%	66.8°
2032-02-12 Thu	57	—	unknown	03:35–05:50 (good, 2.25 h)	87.1° 09:25	10.38	4%	73.5°
2032-02-13 Fri	58	—	unknown	03:30–05:50 (good, 2.33 h)	87.1° 09:25	10.34	10%	80.9°
2032-02-14 Sat	58	—	unknown	03:25–05:45 (good, 2.33 h)	87.1° 09:20	10.3	18%	88.6°
2032-02-15 Sun	60	—	unknown	03:20–05:45 (good, 2.42 h)	87.1° 09:15	10.26	28%	96.0°
2032-02-16 Mon	62	—	unknown	03:15–05:45 (good, 2.5 h)	87.1° 09:10	10.22	38%	103.0°
2032-02-17 Tue	63	—	unknown	03:15–05:45 (good, 2.5 h)	87.1° 09:10	10.18	48%	109.3°
2032-02-18 Wed	63	—	unknown	03:10–05:40 (good, 2.5 h)	87.1° 09:05	10.14	58%	114.5°
2032-02-19 Thu	64	—	unknown	03:05–05:40 (good, 2.58 h)	87.1° 09:00	10.1	67%	118.7°
2032-02-20 Fri	65	—	unknown	03:10–05:40 (good, 2.5 h)	87.1° 08:55	10.06	76%	121.4°
2032-02-21 Sat	64	—	unknown	03:05–05:35 (good, 2.5 h)	87.1° 08:50	10.02	84%	122.7°
2032-02-22 Sun	65	—	unknown	03:05–05:35 (good, 2.5 h)	87.1° 08:50	9.98	90%	122.4°
2032-02-23 Mon	58	—	unknown	03:00–05:35 (good, 2.58 h)	87.1° 08:45	9.93	95%	120.6°
2032-02-24 Tue	57	—	unknown	03:00–05:35 (good, 2.58 h)	87.1° 08:40	9.89	98%	117.4°
2032-02-25 Wed	53	—	unknown	03:00–05:30 (good, 2.5 h)	87.1° 08:35	9.85	100%	113.1°
2032-02-26 Thu	50	—	unknown	03:00–05:30 (good, 2.5 h)	87.1° 08:30	9.8	100%	107.8°
2032-02-27 Fri	48	—	unknown	03:00–05:30 (good, 2.5 h)	87.1° 08:30	9.76	98%	101.8°
2032-02-28 Sat	44	—	unknown	03:10–05:25 (good, 2.25 h)	87.1° 08:25	9.71	94%	95.4°
2032-02-29 Sun	43	—	unknown	03:15–05:25 (good, 2.17 h)	87.1° 08:20	9.67	88%	88.6°
2032-03-01 Mon	43	—	unknown	03:10–05:25 (good, 2.25 h)	87.1° 08:15	9.62	81%	81.9°
2032-03-02 Tue	44	—	unknown	02:50–05:20 (good, 2.5 h)	87.1° 08:15	9.58	72%	75.3°
2032-03-03 Wed	47	—	unknown	02:40–05:20 (good, 2.67 h)	87.1° 08:10	9.53	62%	69.1°
2032-03-04 Thu	53	—	unknown	02:30–05:20 (good, 2.83 h)	87.1° 08:05	9.48	52%	63.8°
2032-03-05 Fri	62	—	unknown	02:05–05:20 (good, 3.25 h)	87.1° 08:00	9.44	40%	59.7°
2032-03-06 Sat	70	—	unknown	02:05–05:15 (good, 3.17 h)	87.1° 07:55	9.39	30%	57.4°
2032-03-07 Sun	78	—	unknown	02:00–05:15 (good, 3.25 h)	87.1° 07:55	9.34	20%	57.3°
2032-03-08 Mon	85	—	unknown	01:55–05:15 (good, 3.33 h)	87.1° 07:50	9.29	11%	59.6°
2032-03-09 Tue	87	—	unknown	01:50–05:10 (good, 3.33 h)	87.1° 07:45	9.25	5%	64.1°
2032-03-10 Wed	89	—	unknown	01:45–05:10 (good, 3.42 h)	87.1° 07:40	9.2	1%	70.3°
2032-03-11 Thu	89	—	unknown	01:45–05:05 (good, 3.33 h)	87.1° 07:35	9.15	0%	77.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-11&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.