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 V1057 Cyg: 06-30 (100), 07-01 (100), 07-02 (100), 07-03 (100), 07-04 (100) — by astronomy; check the weather when the night is within four days.

2032-06-20astronomy score per night — click a bar for that night2032-07-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-06-20 Sun	84	—	unknown	23:15–03:40 (good, 4.42 h)	87.3° 04:20	4.42	92%	95.5°
2032-06-21 Mon	75	—	unknown	23:15–03:40 (good, 4.42 h)	87.3° 04:20	4.42	97%	87.2°
2032-06-22 Tue	63	—	unknown	23:55–03:40 (good, 3.75 h)	87.3° 04:15	4.43	100%	78.8°
2032-06-23 Wed	53	—	unknown	00:45–03:40 (good, 2.92 h)	87.3° 04:10	4.43	100%	70.6°
2032-06-24 Thu	48	—	unknown	01:20–01:25 (good, 0.08 h)	87.3° 04:05	4.44	97%	63.4°
2032-06-25 Fri	50	—	unknown	00:35–01:35 (good, 1.0 h)	87.3° 04:00	4.45	91%	57.6°
2032-06-26 Sat	57	—	unknown	23:15–02:40 (good, 3.42 h)	87.3° 04:00	4.46	84%	54.0°
2032-06-27 Sun	88	—	unknown	23:15–03:40 (good, 4.42 h)	87.3° 03:55	4.48	74%	53.0°
2032-06-28 Mon	95	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 03:50	4.49	63%	54.8°
2032-06-29 Tue	99	—	unknown	23:10–03:45 (good, 4.58 h)	87.3° 03:45	4.51	52%	58.9°
2032-06-30 Wed	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.3° 03:45	4.53	41%	64.6°
2032-07-01 Thu	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.3° 03:40	4.55	30%	71.4°
2032-07-02 Fri	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.3° 03:35	4.57	21%	78.9°
2032-07-03 Sat	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.3° 03:30	4.6	13%	86.6°
2032-07-04 Sun	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.3° 03:25	4.63	7%	94.2°
2032-07-05 Mon	100	—	unknown	23:10–03:50 (good, 4.67 h)	87.3° 03:25	4.65	3%	101.7°
2032-07-06 Tue	100	—	unknown	23:10–03:50 (good, 4.67 h)	87.3° 03:20	4.68	1%	108.6°
2032-07-07 Wed	100	—	unknown	23:05–03:50 (good, 4.75 h)	87.3° 03:15	4.72	0%	114.8°
2032-07-08 Thu	100	—	unknown	23:05–03:50 (good, 4.75 h)	87.3° 03:10	4.75	2%	120.0°
2032-07-09 Fri	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.3° 03:05	4.78	5%	123.9°
2032-07-10 Sat	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.3° 03:05	4.82	10%	126.3°
2032-07-11 Sun	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.3° 03:00	4.86	16%	126.9°
2032-07-12 Mon	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.3° 02:55	4.9	24%	125.6°
2032-07-13 Tue	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.3° 02:50	4.94	32%	122.7°
2032-07-14 Wed	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.3° 02:50	4.98	42%	118.3°
2032-07-15 Thu	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.3° 02:45	5.02	52%	112.6°
2032-07-16 Fri	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.3° 02:40	5.07	62%	105.9°
2032-07-17 Sat	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.3° 02:35	5.11	72%	98.5°
2032-07-18 Sun	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.3° 02:30	5.16	81%	90.5°
2032-07-19 Mon	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.3° 02:30	5.2	89%	82.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-06-20&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.