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 Triangulum Pinwheel: 12-05 (100), 12-06 (100), 12-16 (100), 12-17 (100), 12-18 (100) — by astronomy; check the weather when the night is within four days.

2035-12-05astronomy score per night — click a bar for that night2036-01-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-12-05 Wed	100	—	unknown	18:35–02:30 (good, 7.92 h)	79.1° 21:00	11.39	30%	73.9°
2035-12-06 Thu	100	—	unknown	18:35–02:30 (good, 7.92 h)	79.2° 20:55	11.4	39%	63.1°
2035-12-07 Fri	95	—	unknown	18:35–02:25 (good, 7.83 h)	79.1° 20:50	11.42	49%	52.3°
2035-12-08 Sat	87	—	unknown	18:35–02:20 (good, 7.75 h)	79.1° 20:45	11.43	59%	41.9°
2035-12-09 Sun	77	—	unknown	01:50–02:15 (good, 0.42 h)	79.1° 20:45	11.44	69%	32.4°
2035-12-10 Mon	48	—	unknown	18:35–02:35 (marginal, 8.0 h)	79.2° 20:40	11.45	78%	25.5°
2035-12-11 Tue	34	—	unknown	18:35–02:15 (marginal, 7.67 h)	79.1° 20:35	11.46	87%	24.3°
2035-12-12 Wed	27	—	unknown	18:35–01:45 (marginal, 7.17 h)	79.1° 20:30	11.47	93%	30.2°
2035-12-13 Thu	35	—	unknown	18:35–00:05 (marginal, 5.5 h)	79.1° 20:30	11.48	98%	40.6°
2035-12-14 Fri	50	—	unknown	18:35–01:35 (marginal, 7.0 h)	79.1° 20:25	11.48	100%	53.1°
2035-12-15 Sat	70	—	unknown	18:35–20:45 (good, 2.17 h)	79.2° 20:20	11.49	99%	66.5°
2035-12-16 Sun	100	—	unknown	18:35–23:25 (good, 4.83 h)	79.1° 20:15	11.5	94%	80.2°
2035-12-17 Mon	100	—	unknown	18:35–01:00 (good, 6.42 h)	79.1° 20:10	11.5	88%	93.9°
2035-12-18 Tue	100	—	unknown	18:35–01:25 (good, 6.83 h)	79.1° 20:10	11.5	79%	107.3°
2035-12-19 Wed	100	—	unknown	18:35–01:30 (good, 6.92 h)	79.1° 20:05	11.51	69%	120.1°
2035-12-20 Thu	100	—	unknown	18:35–01:25 (good, 6.83 h)	79.2° 20:00	11.51	58%	132.1°
2035-12-21 Fri	100	—	unknown	18:35–01:25 (good, 6.83 h)	79.1° 19:55	11.51	47%	142.7°
2035-12-22 Sat	100	—	unknown	18:35–01:25 (good, 6.83 h)	79.1° 19:50	11.51	37%	151.2°
2035-12-23 Sun	100	—	unknown	18:40–01:20 (good, 6.67 h)	79.1° 19:50	11.51	28%	155.8°
2035-12-24 Mon	100	—	unknown	18:40–01:15 (good, 6.58 h)	79.2° 19:45	11.5	19%	154.5°
2035-12-25 Tue	100	—	unknown	18:40–01:15 (good, 6.58 h)	79.1° 19:40	11.5	12%	148.4°
2035-12-26 Wed	100	—	unknown	18:40–01:10 (good, 6.5 h)	79.1° 19:35	11.5	7%	139.8°
2035-12-27 Thu	100	—	unknown	18:40–01:05 (good, 6.42 h)	79.1° 19:35	11.49	3%	130.0°
2035-12-28 Fri	100	—	unknown	18:40–01:00 (good, 6.33 h)	79.1° 19:30	11.49	0%	119.7°
2035-12-29 Sat	100	—	unknown	18:40–00:55 (good, 6.25 h)	79.2° 19:25	11.48	0%	109.1°
2035-12-30 Sun	100	—	unknown	18:40–00:55 (good, 6.25 h)	79.1° 19:20	11.47	2%	98.3°
2035-12-31 Mon	100	—	unknown	18:45–00:50 (good, 6.08 h)	79.1° 19:15	11.46	5%	87.5°
2036-01-01 Tue	100	—	unknown	18:45–00:45 (good, 6.0 h)	79.1° 19:15	11.45	10%	76.7°
2036-01-02 Wed	100	—	unknown	18:45–00:40 (good, 5.92 h)	79.1° 19:10	11.44	16%	65.9°
2036-01-03 Thu	98	—	unknown	18:45–00:40 (good, 5.92 h)	79.2° 19:05	11.43	23%	55.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-12-05&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.