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: 07-01 (100), 07-02 (100), 07-03 (100), 07-04 (100), 07-05 (100) — by astronomy; check the weather when the night is within four days.

2046-07-01astronomy score per night — click a bar for that night2046-07-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-07-01 Sun	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:20	4.54	6%	109.7°
2046-07-02 Mon	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:15	4.56	2%	113.5°
2046-07-03 Tue	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:10	4.59	0%	116.0°
2046-07-04 Wed	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:05	4.61	1%	117.0°
2046-07-05 Thu	100	—	unknown	23:10–03:50 (good, 4.67 h)	87.1° 01:05	4.64	4%	116.2°
2046-07-06 Fri	100	—	unknown	23:10–03:50 (good, 4.67 h)	87.1° 01:00	4.67	11%	113.6°
2046-07-07 Sat	100	—	unknown	23:10–03:50 (good, 4.67 h)	87.1° 00:55	4.7	19%	109.6°
2046-07-08 Sun	100	—	unknown	23:05–03:50 (good, 4.75 h)	87.1° 00:50	4.74	29%	104.4°
2046-07-09 Mon	100	—	unknown	23:05–03:50 (good, 4.75 h)	87.1° 00:50	4.77	40%	98.5°
2046-07-10 Tue	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:45	4.81	51%	92.2°
2046-07-11 Wed	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:40	4.84	62%	85.8°
2046-07-12 Thu	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:35	4.88	73%	79.8°
2046-07-13 Fri	100	—	unknown	23:00–03:55 (good, 4.92 h)	87.1° 00:30	4.92	82%	74.3°
2046-07-14 Sat	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:30	4.96	90%	69.6°
2046-07-15 Sun	93	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:25	5.01	95%	66.1°
2046-07-16 Mon	62	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:20	5.05	99%	63.9°
2046-07-17 Tue	59	—	unknown	22:55–00:45 (good, 1.83 h)	87.1° 00:15	5.09	100%	63.0°
2046-07-18 Wed	60	—	unknown	22:55–00:50 (good, 1.92 h)	87.1° 00:10	5.14	99%	63.7°
2046-07-19 Thu	65	—	unknown	22:55–01:45 (good, 2.83 h)	87.1° 00:10	5.19	96%	65.6°
2046-07-20 Fri	72	—	unknown	22:55–02:55 (good, 4.0 h)	87.1° 00:05	5.23	92%	68.6°
2046-07-21 Sat	77	—	unknown	22:50–03:30 (good, 4.67 h)	87.1° 00:00	5.28	86%	72.4°
2046-07-22 Sun	82	—	unknown	22:50–04:10 (good, 5.33 h)	87.1° 23:55	5.33	79%	77.0°
2046-07-23 Mon	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.1° 23:55	5.38	70%	81.9°
2046-07-24 Tue	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:50	5.43	62%	87.2°
2046-07-25 Wed	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:45	5.48	52%	92.6°
2046-07-26 Thu	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:40	5.53	42%	98.0°
2046-07-27 Fri	100	—	unknown	22:45–04:20 (good, 5.58 h)	87.1° 23:35	5.59	33%	103.2°
2046-07-28 Sat	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:35	5.64	23%	108.0°
2046-07-29 Sun	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:30	5.69	15%	112.1°
2046-07-30 Mon	100	—	unknown	22:40–04:25 (good, 5.75 h)	87.1° 23:25	5.75	8%	115.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-07-01&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.