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: 11-20 (56), 11-21 (49), 11-22 (42), 12-05 (37), 11-23 (36) — by astronomy; check the weather when the night is within four days.

2047-11-20astronomy score per night — click a bar for that night2047-12-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-11-20 Wed	56	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.09	16%	61.0°
2047-11-21 Thu	49	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 15:00	11.12	25%	60.7°
2047-11-22 Fri	42	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:55	11.14	35%	62.3°
2047-11-23 Sat	36	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:50	11.17	46%	65.3°
2047-11-24 Sun	32	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:45	11.19	56%	69.5°
2047-11-25 Mon	28	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 14:40	11.21	65%	74.5°
2047-11-26 Tue	26	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 14:40	11.23	74%	80.0°
2047-11-27 Wed	25	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 14:35	11.25	82%	85.7°
2047-11-28 Thu	25	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 14:30	11.27	89%	91.6°
2047-11-29 Fri	26	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:25	11.29	94%	97.3°
2047-11-30 Sat	27	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:20	11.31	98%	102.8°
2047-12-01 Sun	29	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:20	11.33	100%	107.9°
2047-12-02 Mon	31	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:15	11.35	100%	112.3°
2047-12-03 Tue	32	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:10	11.36	98%	115.9°
2047-12-04 Wed	33	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:05	11.38	95%	118.3°
2047-12-05 Thu	37	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:05	11.39	90%	119.4°
2047-12-06 Fri	36	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:00	11.41	83%	119.0°
2047-12-07 Sat	35	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.42	74%	117.2°
2047-12-08 Sun	33	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:50	11.43	65%	113.9°
2047-12-09 Mon	32	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:45	11.44	55%	109.3°
2047-12-10 Tue	31	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:45	11.45	44%	103.6°
2047-12-11 Wed	29	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:40	11.46	33%	97.2°
2047-12-12 Thu	28	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:35	11.47	22%	90.2°
2047-12-13 Fri	26	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	14%	83.1°
2047-12-14 Sat	26	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:25	11.48	6%	76.1°
2047-12-15 Sun	24	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:25	11.49	2%	69.9°
2047-12-16 Mon	23	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 13:20	11.5	0%	65.0°
2047-12-17 Tue	22	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:15	11.5	1%	61.7°
2047-12-18 Wed	21	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 13:10	11.5	5%	60.5°
2047-12-19 Thu	18	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:10	11.51	12%	61.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-11-20&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.