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: 11-11 (73), 11-12 (73), 11-13 (71), 11-14 (70), 11-15 (67) — by astronomy; check the weather when the night is within four days.

2042-11-11astronomy score per night — click a bar for that night2042-12-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2042-11-11 Tue	73	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:35	10.84	1%	80.6°
2042-11-12 Wed	73	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.87	0%	76.5°
2042-11-13 Thu	71	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.9	1%	72.9°
2042-11-14 Fri	70	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.93	4%	70.0°
2042-11-15 Sat	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.96	9%	68.0°
2042-11-16 Sun	62	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	10.99	15%	67.0°
2042-11-17 Mon	57	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.02	23%	67.1°
2042-11-18 Tue	50	—	unknown	18:40–21:00 (good, 2.33 h)	87.1° 15:10	11.05	32%	68.5°
2042-11-19 Wed	45	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 15:05	11.07	43%	71.0°
2042-11-20 Thu	39	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 15:00	11.1	54%	74.7°
2042-11-21 Fri	35	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:55	11.12	64%	79.2°
2042-11-22 Sat	32	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:55	11.15	75%	84.4°
2042-11-23 Sun	30	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:50	11.17	84%	90.1°
2042-11-24 Mon	30	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:45	11.19	92%	95.9°
2042-11-25 Tue	31	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:40	11.22	97%	101.4°
2042-11-26 Wed	33	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:35	11.24	100%	106.2°
2042-11-27 Thu	35	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:35	11.26	99%	109.9°
2042-11-28 Fri	37	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:30	11.28	96%	112.3°
2042-11-29 Sat	42	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:25	11.3	90%	113.2°
2042-11-30 Sun	43	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:20	11.32	83%	112.6°
2042-12-01 Mon	43	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.33	74%	110.7°
2042-12-02 Tue	42	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.35	64%	107.8°
2042-12-03 Wed	40	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.37	55%	104.2°
2042-12-04 Thu	38	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:05	11.38	45%	100.1°
2042-12-05 Fri	37	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:00	11.4	36%	95.6°
2042-12-06 Sat	36	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:00	11.41	27%	91.0°
2042-12-07 Sun	34	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.42	19%	86.3°
2042-12-08 Mon	33	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:50	11.43	12%	81.8°
2042-12-09 Tue	31	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:45	11.44	7%	77.6°
2042-12-10 Wed	30	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:40	11.45	3%	73.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-11-11&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.