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: 07-31 (100), 08-01 (100), 08-02 (100), 08-03 (100), 08-04 (100) — by astronomy; check the weather when the night is within four days.

2033-07-31astronomy score per night — click a bar for that night2033-08-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-07-31 Sun	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:20	5.81	27%	91.9°
2033-08-01 Mon	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:15	5.86	36%	85.4°
2033-08-02 Tue	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:10	5.92	45%	79.0°
2033-08-03 Wed	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:10	5.98	55%	72.9°
2033-08-04 Thu	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:05	6.03	64%	67.3°
2033-08-05 Fri	97	—	unknown	22:25–04:30 (good, 6.08 h)	87.1° 23:00	6.09	74%	62.5°
2033-08-06 Sat	91	—	unknown	22:25–04:35 (good, 6.17 h)	87.1° 22:55	6.14	82%	58.9°
2033-08-07 Sun	84	—	unknown	23:50–04:35 (good, 4.75 h)	87.1° 22:55	6.2	90%	56.9°
2033-08-08 Mon	57	—	unknown	22:20–04:35 (marginal, 6.25 h)	87.1° 22:50	6.26	95%	56.9°
2033-08-09 Tue	54	—	unknown	22:20–04:40 (marginal, 6.33 h)	87.1° 22:45	6.32	99%	59.2°
2033-08-10 Wed	58	—	unknown	22:20–22:50 (good, 0.5 h)	87.1° 22:40	6.37	100%	63.5°
2033-08-11 Thu	67	—	unknown	22:15–00:35 (good, 2.33 h)	87.1° 22:35	6.43	98%	69.5°
2033-08-12 Fri	75	—	unknown	22:15–02:00 (good, 3.75 h)	87.1° 22:35	6.49	93%	76.7°
2033-08-13 Sat	82	—	unknown	22:10–03:00 (good, 4.83 h)	87.1° 22:30	6.54	86%	84.6°
2033-08-14 Sun	100	—	unknown	22:10–03:55 (good, 5.75 h)	87.1° 22:25	6.6	77%	92.6°
2033-08-15 Mon	100	—	unknown	22:10–04:00 (good, 5.83 h)	87.1° 22:20	6.66	66%	100.4°
2033-08-16 Tue	100	—	unknown	22:05–04:05 (good, 6.0 h)	87.1° 22:15	6.72	55%	107.6°
2033-08-17 Wed	100	—	unknown	22:05–04:05 (good, 6.0 h)	87.1° 22:15	6.78	44%	113.8°
2033-08-18 Thu	100	—	unknown	22:05–04:05 (good, 6.0 h)	87.1° 22:10	6.83	34%	118.7°
2033-08-19 Fri	100	—	unknown	22:00–04:00 (good, 6.0 h)	87.1° 22:05	6.89	24%	122.0°
2033-08-20 Sat	100	—	unknown	22:00–04:00 (good, 6.0 h)	87.1° 22:00	6.95	16%	123.4°
2033-08-21 Sun	100	—	unknown	21:55–03:55 (good, 6.0 h)	87.1° 21:55	7.0	9%	122.8°
2033-08-22 Mon	100	—	unknown	21:55–03:55 (good, 6.0 h)	87.1° 21:55	7.06	4%	120.6°
2033-08-23 Tue	100	—	unknown	21:55–03:50 (good, 5.92 h)	87.1° 21:50	7.12	1%	116.8°
2033-08-24 Wed	100	—	unknown	21:50–03:45 (good, 5.92 h)	87.1° 21:45	7.18	0%	111.9°
2033-08-25 Thu	100	—	unknown	21:50–03:40 (good, 5.83 h)	87.1° 21:40	7.23	1%	106.3°
2033-08-26 Fri	100	—	unknown	21:45–03:35 (good, 5.83 h)	87.1° 21:40	7.29	4%	100.1°
2033-08-27 Sat	100	—	unknown	21:45–03:35 (good, 5.83 h)	87.1° 21:35	7.35	8%	93.7°
2033-08-28 Sun	100	—	unknown	21:45–03:30 (good, 5.75 h)	87.1° 21:30	7.4	14%	87.2°
2033-08-29 Mon	100	—	unknown	21:40–03:25 (good, 5.75 h)	87.1° 21:25	7.46	21%	80.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-07-31&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.