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: 07-06 (100), 07-07 (100), 07-08 (100), 07-09 (100), 07-10 (100) — by astronomy; check the weather when the night is within four days.

2032-07-06astronomy score per night — click a bar for that night2032-08-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-07-06 Tue	100	—	unknown	23:10–03:50 (good, 4.67 h)	87.1° 00:55	4.68	1%	122.4°
2032-07-07 Wed	100	—	unknown	23:05–03:50 (good, 4.75 h)	87.1° 00:55	4.72	0%	123.0°
2032-07-08 Thu	100	—	unknown	23:05–03:50 (good, 4.75 h)	87.1° 00:50	4.75	2%	121.9°
2032-07-09 Fri	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:45	4.78	5%	119.4°
2032-07-10 Sat	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:40	4.82	10%	115.5°
2032-07-11 Sun	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:40	4.86	16%	110.7°
2032-07-12 Mon	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:35	4.9	24%	105.1°
2032-07-13 Tue	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:30	4.94	32%	99.0°
2032-07-14 Wed	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:25	4.98	42%	92.5°
2032-07-15 Thu	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:20	5.02	52%	85.8°
2032-07-16 Fri	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:20	5.07	62%	79.1°
2032-07-17 Sat	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:15	5.11	72%	72.6°
2032-07-18 Sun	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:10	5.16	81%	66.6°
2032-07-19 Mon	95	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:05	5.2	89%	61.7°
2032-07-20 Tue	62	—	unknown	01:15–04:10 (good, 2.92 h)	87.1° 00:00	5.25	95%	58.3°
2032-07-21 Wed	51	—	unknown	22:50–04:10 (marginal, 5.33 h)	87.1° 00:00	5.3	99%	57.0°
2032-07-22 Thu	51	—	unknown	22:50–04:10 (marginal, 5.33 h)	87.1° 23:55	5.35	100%	58.2°
2032-07-23 Fri	57	—	unknown	22:50–23:50 (good, 1.0 h)	87.1° 23:50	5.4	98%	61.8°
2032-07-24 Sat	70	—	unknown	22:45–02:00 (good, 3.25 h)	87.1° 23:45	5.45	93%	67.3°
2032-07-25 Sun	78	—	unknown	22:45–03:20 (good, 4.58 h)	87.1° 23:45	5.5	86%	74.1°
2032-07-26 Mon	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:40	5.55	76%	81.6°
2032-07-27 Tue	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:35	5.61	66%	89.3°
2032-07-28 Wed	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:30	5.66	55%	96.9°
2032-07-29 Thu	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:25	5.71	44%	103.9°
2032-07-30 Fri	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:25	5.77	34%	110.2°
2032-07-31 Sat	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:20	5.82	25%	115.4°
2032-08-01 Sun	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:15	5.88	16%	119.5°
2032-08-02 Mon	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:10	5.93	10%	122.1°
2032-08-03 Tue	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:05	5.99	5%	123.0°
2032-08-04 Wed	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:05	6.05	2%	122.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-06&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.