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: 12-31 (100), 01-01 (100), 01-02 (100), 01-03 (100), 01-04 (100) — by astronomy; check the weather when the night is within four days.

2034-12-31astronomy score per night — click a bar for that night2035-01-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-12-31 Sun	100	—	unknown	18:45–00:45 (good, 6.0 h)	79.1° 19:15	11.46	55%	145.1°
2035-01-01 Mon	100	—	unknown	18:45–00:45 (good, 6.0 h)	79.1° 19:10	11.45	45%	153.0°
2035-01-02 Tue	100	—	unknown	18:45–00:40 (good, 5.92 h)	79.1° 19:10	11.44	36%	156.9°
2035-01-03 Wed	100	—	unknown	18:45–00:35 (good, 5.83 h)	79.1° 19:05	11.43	27%	155.3°
2035-01-04 Thu	100	—	unknown	18:45–00:35 (good, 5.83 h)	79.1° 19:00	11.42	19%	149.1°
2035-01-05 Fri	100	—	unknown	18:45–00:30 (good, 5.75 h)	79.1° 18:55	11.4	12%	140.5°
2035-01-06 Sat	100	—	unknown	18:50–00:25 (good, 5.58 h)	79.1° 18:50	11.39	7%	130.7°
2035-01-07 Sun	100	—	unknown	18:50–00:20 (good, 5.5 h)	79.1° 18:50	11.38	3%	120.3°
2035-01-08 Mon	100	—	unknown	18:50–00:15 (good, 5.42 h)	79.1° 18:45	11.36	1%	109.5°
2035-01-09 Tue	100	—	unknown	18:50–00:15 (good, 5.42 h)	79.1° 18:40	11.34	0%	98.3°
2035-01-10 Wed	100	—	unknown	18:50–00:10 (good, 5.33 h)	79.1° 18:35	11.33	2%	87.0°
2035-01-11 Thu	100	—	unknown	18:50–00:05 (good, 5.25 h)	79.1° 18:35	11.31	5%	75.5°
2035-01-12 Fri	100	—	unknown	18:55–00:00 (good, 5.08 h)	79.1° 18:30	11.29	11%	64.0°
2035-01-13 Sat	97	—	unknown	18:55–23:55 (good, 5.0 h)	79.1° 18:25	11.27	18%	52.5°
2035-01-14 Sun	88	—	unknown	18:55–23:55 (good, 5.0 h)	79.1° 18:20	11.25	26%	41.5°
2035-01-15 Mon	79	—	unknown	18:55–23:50 (good, 4.92 h)	79.1° 18:15	11.23	36%	31.6°
2035-01-16 Tue	62	—	unknown	18:55–23:20 (good, 4.42 h)	79.1° 18:15	11.21	47%	24.6°
2035-01-17 Wed	44	—	unknown	19:00–00:05 (marginal, 5.08 h)	79.1° 18:10	11.18	58%	23.7°
2035-01-18 Thu	30	—	unknown	19:00–23:50 (marginal, 4.83 h)	79.1° 18:05	11.16	69%	30.0°
2035-01-19 Fri	26	—	unknown	19:00–23:35 (marginal, 4.58 h)	79.1° 18:00	11.14	80%	40.4°
2035-01-20 Sat	28	—	unknown	19:00–23:25 (marginal, 4.42 h)	79.1° 17:55	11.11	88%	52.7°
2035-01-21 Sun	35	—	unknown	19:00–23:25 (marginal, 4.42 h)	79.1° 17:55	11.09	95%	65.9°
2035-01-22 Mon	46	—	unknown	19:05–20:40 (good, 1.58 h)	79.1° 17:50	11.06	99%	79.3°
2035-01-23 Tue	61	—	unknown	19:05–21:55 (good, 2.83 h)	79.1° 17:45	11.03	100%	92.8°
2035-01-24 Wed	77	—	unknown	19:05–22:50 (good, 3.75 h)	79.1° 17:40	11.01	98%	106.0°
2035-01-25 Thu	98	—	unknown	19:05–23:00 (good, 3.92 h)	79.1° 17:40	10.98	94%	118.7°
2035-01-26 Fri	100	—	unknown	19:05–22:55 (good, 3.83 h)	79.1° 17:35	10.95	88%	130.6°
2035-01-27 Sat	100	—	unknown	19:10–22:55 (good, 3.75 h)	79.1° 17:30	10.92	81%	141.5°
2035-01-28 Sun	99	—	unknown	19:10–22:55 (good, 3.75 h)	79.1° 17:25	10.89	72%	150.4°
2035-01-29 Mon	98	—	unknown	19:10–22:55 (good, 3.75 h)	79.1° 17:20	10.86	63%	156.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-12-31&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.