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: 06-24 (100), 06-25 (100), 06-26 (100), 06-27 (100), 06-28 (100) — by astronomy; check the weather when the night is within four days.

2047-06-24astronomy score per night — click a bar for that night2047-07-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-06-24 Mon	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 04:10	4.44	2%	111.2°
2047-06-25 Tue	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 04:05	4.44	6%	117.4°
2047-06-26 Wed	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 04:00	4.45	13%	122.4°
2047-06-27 Thu	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 03:55	4.47	21%	125.8°
2047-06-28 Fri	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 03:55	4.48	30%	126.9°
2047-06-29 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 03:50	4.5	41%	125.7°
2047-06-30 Sun	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:45	4.52	52%	122.0°
2047-07-01 Mon	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:40	4.54	64%	116.4°
2047-07-02 Tue	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:40	4.56	74%	109.3°
2047-07-03 Wed	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:35	4.58	84%	101.2°
2047-07-04 Thu	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:30	4.61	92%	92.6°
2047-07-05 Fri	78	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:25	4.64	97%	84.0°
2047-07-06 Sat	67	—	unknown	23:10–03:50 (good, 4.67 h)	87.2° 03:20	4.67	100%	75.6°
2047-07-07 Sun	57	—	unknown	23:15–03:50 (good, 4.58 h)	87.2° 03:20	4.7	100%	68.0°
2047-07-08 Mon	53	—	unknown	23:20–01:00 (good, 1.67 h)	87.2° 03:15	4.73	97%	61.6°
2047-07-09 Tue	53	—	unknown	23:05–01:05 (good, 2.0 h)	87.2° 03:10	4.76	92%	56.8°
2047-07-10 Wed	59	—	unknown	23:05–01:40 (good, 2.58 h)	87.2° 03:05	4.8	86%	53.9°
2047-07-11 Thu	89	—	unknown	23:05–03:00 (good, 3.92 h)	87.2° 03:00	4.83	78%	53.1°
2047-07-12 Fri	95	—	unknown	23:05–03:55 (good, 4.83 h)	87.2° 03:00	4.87	70%	54.3°
2047-07-13 Sat	98	—	unknown	23:00–03:55 (good, 4.92 h)	87.2° 02:55	4.91	60%	57.3°
2047-07-14 Sun	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.2° 02:50	4.95	51%	61.7°
2047-07-15 Mon	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.2° 02:45	5.0	41%	67.2°
2047-07-16 Tue	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.2° 02:45	5.04	32%	73.4°
2047-07-17 Wed	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.2° 02:40	5.08	24%	80.2°
2047-07-18 Thu	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.2° 02:35	5.13	16%	87.3°
2047-07-19 Fri	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.2° 02:30	5.17	9%	94.7°
2047-07-20 Sat	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.2° 02:25	5.22	4%	102.1°
2047-07-21 Sun	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.2° 02:25	5.27	1%	109.2°
2047-07-22 Mon	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.2° 02:20	5.32	0%	115.7°
2047-07-23 Tue	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.2° 02:15	5.37	1%	121.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-06-24&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.