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: 07-11 (100), 07-12 (100), 07-13 (100), 07-14 (100), 07-15 (100) — by astronomy; check the weather when the night is within four days.

2047-07-06astronomy score per night — click a bar for that night2047-08-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-07-06 Sat	57	—	unknown	23:10–03:50 (good, 4.67 h)	87.1° 01:00	4.67	100%	62.7°
2047-07-07 Sun	55	—	unknown	23:10–00:25 (good, 1.25 h)	87.1° 00:55	4.7	100%	61.4°
2047-07-08 Mon	59	—	unknown	23:05–01:05 (good, 2.0 h)	87.1° 00:50	4.73	97%	61.9°
2047-07-09 Tue	66	—	unknown	23:05–02:35 (good, 3.5 h)	87.1° 00:50	4.76	92%	64.1°
2047-07-10 Wed	76	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:45	4.8	86%	67.6°
2047-07-11 Thu	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:40	4.83	78%	72.1°
2047-07-12 Fri	100	—	unknown	23:05–03:55 (good, 4.83 h)	87.1° 00:35	4.87	70%	77.2°
2047-07-13 Sat	100	—	unknown	23:00–03:55 (good, 4.92 h)	87.1° 00:35	4.91	60%	82.7°
2047-07-14 Sun	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:30	4.95	51%	88.4°
2047-07-15 Mon	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:25	5.0	41%	94.0°
2047-07-16 Tue	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:20	5.04	32%	99.6°
2047-07-17 Wed	100	—	unknown	23:00–04:00 (good, 5.0 h)	87.1° 00:15	5.08	24%	104.8°
2047-07-18 Thu	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:15	5.13	16%	109.5°
2047-07-19 Fri	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:10	5.17	9%	113.6°
2047-07-20 Sat	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.1° 00:05	5.22	4%	116.6°
2047-07-21 Sun	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.1° 00:00	5.27	1%	118.3°
2047-07-22 Mon	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.1° 23:55	5.32	0%	118.5°
2047-07-23 Tue	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.1° 23:55	5.37	1%	117.1°
2047-07-24 Wed	100	—	unknown	22:50–04:15 (good, 5.42 h)	87.1° 23:50	5.42	5%	114.0°
2047-07-25 Thu	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:45	5.47	10%	109.6°
2047-07-26 Fri	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:40	5.52	18%	104.1°
2047-07-27 Sat	100	—	unknown	22:45–04:20 (good, 5.58 h)	87.1° 23:40	5.57	28%	97.8°
2047-07-28 Sun	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:35	5.63	39%	91.1°
2047-07-29 Mon	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:30	5.68	50%	84.3°
2047-07-30 Tue	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:25	5.73	62%	77.8°
2047-07-31 Wed	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:20	5.79	72%	71.9°
2047-08-01 Thu	98	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:20	5.84	82%	67.0°
2047-08-02 Fri	90	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:15	5.9	90%	63.5°
2047-08-03 Sat	81	—	unknown	22:30–03:45 (good, 5.25 h)	87.1° 23:10	5.95	96%	61.6°
2047-08-04 Sun	59	—	unknown	22:30–22:50 (good, 0.33 h)	87.1° 23:05	6.01	99%	61.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-07-06&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.