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: 12-01 (100), 12-02 (100), 12-03 (100), 12-04 (100), 12-05 (100) — by astronomy; check the weather when the night is within four days.

2029-12-01astronomy score per night — click a bar for that night2029-12-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-12-01 Sat	100	—	unknown	18:35–23:00 (good, 4.42 h)	87.3° 16:40	11.34	19%	119.2°
2029-12-02 Sun	100	—	unknown	18:35–22:55 (good, 4.33 h)	87.3° 16:35	11.35	11%	112.2°
2029-12-03 Mon	100	—	unknown	18:35–22:50 (good, 4.25 h)	87.3° 16:30	11.37	4%	104.0°
2029-12-04 Tue	100	—	unknown	18:35–22:45 (good, 4.17 h)	87.3° 16:25	11.38	1%	95.0°
2029-12-05 Wed	100	—	unknown	18:35–22:40 (good, 4.08 h)	87.3° 16:20	11.4	0%	85.8°
2029-12-06 Thu	100	—	unknown	18:35–22:40 (good, 4.08 h)	87.3° 16:20	11.41	2%	77.0°
2029-12-07 Fri	100	—	unknown	18:35–22:35 (good, 4.0 h)	87.3° 16:15	11.42	7%	68.9°
2029-12-08 Sat	95	—	unknown	18:35–22:30 (good, 3.92 h)	87.3° 16:10	11.44	14%	62.0°
2029-12-09 Sun	86	—	unknown	18:35–22:25 (good, 3.83 h)	87.3° 16:05	11.45	23%	56.8°
2029-12-10 Mon	73	—	unknown	18:35–22:10 (good, 3.58 h)	87.3° 16:05	11.46	32%	53.5°
2029-12-11 Tue	61	—	unknown	18:35–22:00 (good, 3.42 h)	87.3° 16:00	11.47	42%	52.3°
2029-12-12 Wed	51	—	unknown	18:35–21:45 (good, 3.17 h)	87.3° 15:55	11.47	52%	53.3°
2029-12-13 Thu	42	—	unknown	18:35–20:00 (good, 1.42 h)	87.3° 15:50	11.48	61%	56.0°
2029-12-14 Fri	36	—	unknown	18:35–19:05 (good, 0.5 h)	87.3° 15:45	11.49	70%	60.3°
2029-12-15 Sat	34	—	unknown	18:35–18:40 (good, 0.08 h)	87.3° 15:45	11.49	79%	65.7°
2029-12-16 Sun	33	—	unknown	18:35–18:45 (good, 0.17 h)	87.3° 15:40	11.5	86%	72.0°
2029-12-17 Mon	35	—	unknown	18:35–19:05 (good, 0.5 h)	87.3° 15:35	11.5	92%	78.8°
2029-12-18 Tue	38	—	unknown	18:35–19:40 (good, 1.08 h)	87.3° 15:30	11.5	96%	86.0°
2029-12-19 Wed	43	—	unknown	18:35–20:20 (good, 1.75 h)	87.3° 15:25	11.51	99%	93.3°
2029-12-20 Thu	50	—	unknown	18:35–21:05 (good, 2.5 h)	87.3° 15:25	11.51	100%	100.7°
2029-12-21 Fri	55	—	unknown	18:35–21:15 (good, 2.67 h)	87.3° 15:20	11.51	99%	107.9°
2029-12-22 Sat	68	—	unknown	18:35–21:20 (good, 2.75 h)	87.3° 15:15	11.51	96%	114.5°
2029-12-23 Sun	69	—	unknown	18:40–21:20 (good, 2.67 h)	87.3° 15:10	11.51	91%	120.3°
2029-12-24 Mon	69	—	unknown	18:40–21:20 (good, 2.67 h)	87.3° 15:10	11.5	84%	124.7°
2029-12-25 Tue	69	—	unknown	18:40–21:25 (good, 2.75 h)	87.3° 15:05	11.5	76%	127.2°
2029-12-26 Wed	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.3° 15:00	11.49	66%	127.5°
2029-12-27 Thu	65	—	unknown	18:40–21:15 (good, 2.58 h)	87.3° 14:55	11.49	55%	125.3°
2029-12-28 Fri	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.3° 14:50	11.48	44%	120.9°
2029-12-29 Sat	61	—	unknown	18:40–21:10 (good, 2.5 h)	87.3° 14:50	11.48	33%	114.6°
2029-12-30 Sun	59	—	unknown	18:40–21:05 (good, 2.42 h)	87.3° 14:45	11.47	23%	107.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-12-01&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.