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: 06-02 (100), 06-03 (100), 06-04 (100), 06-05 (100), 06-06 (100) — by astronomy; check the weather when the night is within four days.

2032-05-28astronomy score per night — click a bar for that night2032-06-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-28 Fri	56	—	unknown	00:10–03:50 (good, 3.67 h)	87.3° 05:50	4.93	82%	61.2°
2032-05-29 Sat	74	—	unknown	23:35–03:50 (good, 4.25 h)	87.3° 05:50	4.89	72%	56.1°
2032-05-30 Sun	84	—	unknown	23:30–03:45 (good, 4.25 h)	87.3° 05:45	4.85	61%	53.3°
2032-05-31 Mon	91	—	unknown	23:25–03:45 (good, 4.33 h)	87.3° 05:40	4.81	49%	53.1°
2032-06-01 Tue	96	—	unknown	23:20–03:45 (good, 4.42 h)	87.3° 05:35	4.78	38%	55.4°
2032-06-02 Wed	100	—	unknown	23:20–03:45 (good, 4.42 h)	87.3° 05:35	4.74	28%	59.8°
2032-06-03 Thu	100	—	unknown	23:15–03:45 (good, 4.5 h)	87.3° 05:30	4.71	18%	65.9°
2032-06-04 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 05:25	4.68	11%	73.0°
2032-06-05 Sat	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.3° 05:20	4.65	5%	80.6°
2032-06-06 Sun	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.3° 05:15	4.62	1%	88.5°
2032-06-07 Mon	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.3° 05:15	4.59	0%	96.2°
2032-06-08 Tue	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.3° 05:10	4.57	1%	103.7°
2032-06-09 Wed	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.3° 05:05	4.54	4%	110.5°
2032-06-10 Thu	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.3° 05:00	4.52	8%	116.5°
2032-06-11 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:55	4.5	14%	121.4°
2032-06-12 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:55	4.49	22%	124.9°
2032-06-13 Sun	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:50	4.47	30%	126.8°
2032-06-14 Mon	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:45	4.46	39%	126.9°
2032-06-15 Tue	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:40	4.45	48%	125.1°
2032-06-16 Wed	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:40	4.44	58%	121.7°
2032-06-17 Thu	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:35	4.43	67%	116.8°
2032-06-18 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:30	4.43	76%	110.6°
2032-06-19 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.3° 04:25	4.42	85%	103.4°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-28&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.