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: 06-13 (100), 06-14 (100), 06-15 (100), 06-16 (100), 06-17 (100) — by astronomy; check the weather when the night is within four days.

2036-06-12astronomy score per night — click a bar for that night2036-07-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2036-07-01 Tue	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:15	4.55	63%	81.1°
2036-07-02 Wed	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:15	4.57	72%	74.7°
2036-07-03 Thu	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:10	4.6	81%	69.1°
2036-07-04 Fri	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.1° 01:05	4.63	88%	64.5°
2036-07-05 Sat	64	—	unknown	00:20–03:50 (good, 3.5 h)	87.1° 01:00	4.65	94%	61.1°
2036-07-06 Sun	56	—	unknown	02:10–03:50 (good, 1.67 h)	87.1° 00:55	4.69	98%	59.2°
2036-07-07 Mon	51	—	unknown	03:20–03:50 (good, 0.5 h)	87.1° 00:55	4.72	100%	58.7°
2036-07-08 Tue	52	—	unknown	23:05–23:40 (good, 0.58 h)	87.1° 00:50	4.75	100%	59.8°
2036-07-09 Wed	58	—	unknown	23:05–00:55 (good, 1.83 h)	87.1° 00:45	4.79	98%	62.2°
2036-07-10 Thu	67	—	unknown	23:05–03:30 (good, 4.42 h)	87.1° 00:40	4.82	95%	65.9°
2036-07-11 Fri	76	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:40	4.86	90%	70.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-06-12&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.