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: 11-30 (44), 12-01 (42), 12-02 (41), 12-03 (40), 12-04 (38) — by astronomy; check the weather when the night is within four days.

2029-11-30astronomy score per night — click a bar for that night2029-12-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-11-30 Fri	44	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.32	29%	100.0°
2029-12-01 Sat	42	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.34	19%	92.8°
2029-12-02 Sun	41	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.35	11%	85.3°
2029-12-03 Mon	40	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.37	4%	78.0°
2029-12-04 Tue	38	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:05	11.38	1%	71.3°
2029-12-05 Wed	37	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:00	11.4	0%	65.7°
2029-12-06 Thu	36	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.41	2%	61.8°
2029-12-07 Fri	33	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:55	11.42	7%	59.8°
2029-12-08 Sat	29	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:50	11.44	14%	59.9°
2029-12-09 Sun	26	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:45	11.45	23%	61.8°
2029-12-10 Mon	22	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:40	11.46	32%	65.3°
2029-12-11 Tue	19	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:35	11.47	42%	69.8°
2029-12-12 Wed	17	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:35	11.47	52%	75.0°
2029-12-13 Thu	15	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:30	11.48	61%	80.7°
2029-12-14 Fri	14	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:25	11.49	70%	86.6°
2029-12-15 Sat	13	—	unknown	18:35–18:45 (good, 0.17 h)	87.1° 13:20	11.49	79%	92.6°
2029-12-16 Sun	13	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:15	11.5	86%	98.5°
2029-12-17 Mon	13	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:15	11.5	92%	104.2°
2029-12-18 Tue	14	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:10	11.5	96%	109.3°
2029-12-19 Wed	14	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:05	11.51	99%	113.8°
2029-12-20 Thu	14	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:00	11.51	100%	117.4°
2029-12-21 Fri	13	—	unknown	18:35–18:45 (good, 0.17 h)	87.1° 13:00	11.51	99%	119.7°
2029-12-22 Sat	14	—	unknown	18:35–18:45 (good, 0.17 h)	87.1° 12:55	11.51	96%	120.4°
2029-12-23 Sun	12	—	unknown	18:40–18:50 (good, 0.17 h)	87.1° 12:50	11.51	91%	119.6°
2029-12-24 Mon	11	—	unknown	18:40–18:45 (good, 0.08 h)	87.1° 12:45	11.5	84%	117.1°
2029-12-25 Tue	11	—	unknown	18:05–19:15 (marginal, 1.17 h)	87.1° 12:40	11.5	76%	113.1°
2029-12-26 Wed	10	—	unknown	18:40–19:10 (marginal, 0.5 h)	87.1° 12:40	11.49	66%	107.9°
2029-12-27 Thu	9	—	unknown	18:40–19:05 (marginal, 0.42 h)	87.1° 12:35	11.49	55%	101.7°
2029-12-28 Fri	9	—	unknown	18:40–19:00 (marginal, 0.33 h)	87.1° 12:30	11.48	44%	94.9°
2029-12-29 Sat	8	—	unknown	18:40–18:55 (marginal, 0.25 h)	87.1° 12:25	11.48	33%	87.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-11-30&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.