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: 06-26 (100), 06-27 (100), 06-28 (100), 06-29 (100), 06-30 (100) — by astronomy; check the weather when the night is within four days.

2036-06-26astronomy score per night — click a bar for that night2036-07-25

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2036-07-12 Sat	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:35	4.9	83%	75.8°
2036-07-13 Sun	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:30	4.94	75%	81.7°
2036-07-14 Mon	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:25	4.98	66%	87.9°
2036-07-15 Tue	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:20	5.02	57%	94.3°
2036-07-16 Wed	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:20	5.07	47%	100.8°
2036-07-17 Thu	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:15	5.11	36%	107.0°
2036-07-18 Fri	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:10	5.16	26%	112.6°
2036-07-19 Sat	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:05	5.2	17%	117.2°
2036-07-20 Sun	100	—	unknown	22:55–04:10 (good, 5.25 h)	87.1° 00:00	5.25	9%	120.3°
2036-07-21 Mon	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.1° 00:00	5.3	3%	121.4°
2036-07-22 Tue	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.1° 23:55	5.35	0%	120.1°
2036-07-23 Wed	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.1° 23:50	5.4	0%	116.5°
2036-07-24 Thu	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:45	5.45	3%	111.1°
2036-07-25 Fri	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:45	5.5	9%	104.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-06-26&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.