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: 06-01 (100), 06-02 (100), 06-03 (100), 06-13 (100), 06-14 (100) — by astronomy; check the weather when the night is within four days.

2036-06-01astronomy score per night — click a bar for that night2036-06-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-06-01 Sun	100	—	unknown	23:00–03:45 (good, 4.75 h)	87.1° 03:15	4.78	55%	100.5°
2036-06-02 Mon	100	—	unknown	23:00–03:45 (good, 4.75 h)	87.1° 03:10	4.74	66%	93.5°
2036-06-03 Tue	100	—	unknown	23:00–03:45 (good, 4.75 h)	87.1° 03:05	4.71	76%	86.5°
2036-06-04 Wed	80	—	unknown	23:00–03:40 (good, 4.67 h)	87.1° 03:05	4.68	84%	79.8°
2036-06-05 Thu	72	—	unknown	23:30–03:40 (good, 4.17 h)	87.1° 03:00	4.65	91%	73.5°
2036-06-06 Fri	61	—	unknown	00:10–03:40 (good, 3.5 h)	87.1° 02:55	4.62	96%	68.1°
2036-06-07 Sat	53	—	unknown	02:20–03:40 (good, 1.33 h)	87.1° 02:50	4.59	99%	63.7°
2036-06-08 Sun	49	—	unknown	03:35–03:40 (good, 0.08 h)	87.1° 02:45	4.57	100%	60.6°
2036-06-09 Mon	49	—	unknown	23:05–03:40 (marginal, 4.58 h)	87.1° 02:45	4.54	99%	58.9°
2036-06-10 Tue	55	—	unknown	23:05–01:25 (good, 2.33 h)	87.1° 02:40	4.52	96%	58.8°
2036-06-11 Wed	64	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:35	4.5	91%	60.2°
2036-06-12 Thu	98	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:30	4.49	85%	63.0°
2036-06-13 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:30	4.47	78%	66.9°
2036-06-14 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:25	4.46	70%	71.7°
2036-06-15 Sun	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:20	4.45	61%	77.3°
2036-06-16 Mon	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:15	4.44	51%	83.3°
2036-06-17 Tue	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:10	4.43	41%	89.7°
2036-06-18 Wed	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:10	4.43	31%	96.3°
2036-06-19 Thu	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:05	4.42	22%	102.8°
2036-06-20 Fri	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 02:00	4.42	14%	109.0°
2036-06-21 Sat	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 01:55	4.42	7%	114.5°
2036-06-22 Sun	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 01:50	4.43	2%	118.7°
2036-06-23 Mon	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 01:50	4.43	0%	121.0°
2036-06-24 Tue	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 01:45	4.44	1%	121.1°
2036-06-25 Wed	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 01:40	4.45	5%	118.8°
2036-06-26 Thu	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 01:35	4.46	11%	114.5°
2036-06-27 Fri	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 01:35	4.48	20%	108.8°
2036-06-28 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 01:30	4.49	30%	102.1°
2036-06-29 Sun	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:25	4.51	41%	95.0°
2036-06-30 Mon	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:20	4.53	52%	87.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-06-01&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.