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: 12-19 (78), 12-20 (78), 12-21 (77), 12-18 (76), 12-22 (76) — by astronomy; check the weather when the night is within four days.

2032-12-10astronomy score per night — click a bar for that night2033-01-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-12-10 Fri	45	—	unknown	18:35–20:30 (good, 1.92 h)	87.3° 16:00	11.46	63%	58.6°
2032-12-11 Sat	40	—	unknown	18:35–19:25 (good, 0.83 h)	87.3° 16:00	11.47	73%	64.2°
2032-12-12 Sun	38	—	unknown	18:35–19:15 (good, 0.67 h)	87.3° 15:55	11.48	82%	71.2°
2032-12-13 Mon	39	—	unknown	18:35–19:30 (good, 0.92 h)	87.3° 15:50	11.48	90%	78.8°
2032-12-14 Tue	43	—	unknown	18:35–20:00 (good, 1.42 h)	87.3° 15:45	11.49	96%	86.9°
2032-12-15 Wed	49	—	unknown	18:35–20:45 (good, 2.17 h)	87.3° 15:40	11.49	99%	94.9°
2032-12-16 Thu	57	—	unknown	18:35–21:25 (good, 2.83 h)	87.3° 15:40	11.5	100%	102.6°
2032-12-17 Fri	64	—	unknown	18:35–21:30 (good, 2.92 h)	87.3° 15:35	11.5	99%	109.7°
2032-12-18 Sat	76	—	unknown	18:35–21:35 (good, 3.0 h)	87.3° 15:30	11.5	95%	115.9°
2032-12-19 Sun	78	—	unknown	18:35–21:35 (good, 3.0 h)	87.3° 15:25	11.51	90%	120.9°
2032-12-20 Mon	78	—	unknown	18:35–21:35 (good, 3.0 h)	87.3° 15:20	11.51	84%	124.5°
2032-12-21 Tue	77	—	unknown	18:35–21:40 (good, 3.08 h)	87.3° 15:20	11.51	76%	126.3°
2032-12-22 Wed	76	—	unknown	18:35–21:35 (good, 3.0 h)	87.3° 15:15	11.51	68%	126.3°
2032-12-23 Thu	72	—	unknown	18:40–21:30 (good, 2.83 h)	87.3° 15:10	11.5	59%	124.5°
2032-12-24 Fri	70	—	unknown	18:40–21:25 (good, 2.75 h)	87.3° 15:05	11.5	49%	121.2°
2032-12-25 Sat	69	—	unknown	18:40–21:25 (good, 2.75 h)	87.3° 15:05	11.5	40%	116.5°
2032-12-26 Sun	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.3° 15:00	11.49	31%	110.6°
2032-12-27 Mon	65	—	unknown	18:40–21:15 (good, 2.58 h)	87.3° 14:55	11.49	22%	103.9°
2032-12-28 Tue	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.3° 14:50	11.48	14%	96.6°
2032-12-29 Wed	60	—	unknown	18:40–21:05 (good, 2.42 h)	87.3° 14:45	11.47	8%	88.8°
2032-12-30 Thu	59	—	unknown	18:40–21:05 (good, 2.42 h)	87.3° 14:45	11.47	3%	80.8°
2032-12-31 Fri	56	—	unknown	18:45–21:00 (good, 2.25 h)	87.3° 14:40	11.46	0%	72.9°
2033-01-01 Sat	54	—	unknown	18:45–20:55 (good, 2.17 h)	87.3° 14:35	11.45	0%	65.7°
2033-01-02 Sun	52	—	unknown	18:45–20:50 (good, 2.08 h)	87.3° 14:30	11.44	3%	59.7°
2033-01-03 Mon	48	—	unknown	18:45–20:45 (good, 2.0 h)	87.3° 14:25	11.42	9%	55.4°
2033-01-04 Tue	43	—	unknown	18:45–20:35 (good, 1.83 h)	87.3° 14:25	11.41	16%	53.6°
2033-01-05 Wed	37	—	unknown	18:45–20:30 (good, 1.75 h)	87.3° 14:20	11.4	26%	54.5°
2033-01-06 Thu	30	—	unknown	18:50–20:15 (good, 1.42 h)	87.3° 14:15	11.38	36%	57.8°
2033-01-07 Fri	25	—	unknown	18:50–20:00 (good, 1.17 h)	87.3° 14:10	11.37	48%	63.1°
2033-01-08 Sat	21	—	unknown	18:50–19:25 (good, 0.58 h)	87.3° 14:10	11.35	59%	69.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-10&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.