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: 12-08 (100), 12-09 (100), 12-10 (100), 12-11 (100), 12-12 (100) — by astronomy; check the weather when the night is within four days.

2045-12-08astronomy score per night — click a bar for that night2046-01-06

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2045-12-08 Fri	100	—	unknown	18:35–02:20 (good, 7.75 h)	79.2° 20:45	11.44	0%	129.6°
2045-12-09 Sat	100	—	unknown	18:35–02:15 (good, 7.67 h)	79.2° 20:40	11.45	2%	117.4°
2045-12-10 Sun	100	—	unknown	18:35–02:10 (good, 7.58 h)	79.2° 20:40	11.46	6%	105.3°
2045-12-11 Mon	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.2° 20:35	11.47	12%	93.4°
2045-12-12 Tue	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.2° 20:30	11.47	18%	81.7°
2045-12-13 Wed	100	—	unknown	18:35–02:00 (good, 7.42 h)	79.2° 20:25	11.48	26%	70.2°
2045-12-14 Thu	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.2° 20:20	11.49	35%	58.8°
2045-12-15 Fri	92	—	unknown	18:35–01:50 (good, 7.25 h)	79.2° 20:20	11.49	44%	47.5°
2045-12-16 Sat	84	—	unknown	18:35–01:45 (good, 7.17 h)	79.2° 20:15	11.5	54%	36.5°
2045-12-17 Sun	61	—	unknown	22:15–23:40 (good, 1.42 h)	79.2° 20:10	11.5	63%	25.9°
2045-12-18 Mon	48	—	unknown	18:35–02:00 (marginal, 7.42 h)	79.2° 20:05	11.5	72%	17.2°
2045-12-19 Tue	32	—	unknown	18:35–01:45 (marginal, 7.17 h)	79.2° 20:05	11.51	81%	14.6°
2045-12-20 Wed	23	—	unknown	18:35–01:15 (marginal, 6.67 h)	79.2° 20:00	11.51	88%	21.4°
2045-12-21 Thu	21	—	unknown	18:35–20:40 (marginal, 2.08 h)	79.2° 19:55	11.51	94%	32.5°
2045-12-22 Fri	31	—	unknown	18:35–23:30 (marginal, 4.92 h)	79.2° 19:50	11.51	98%	45.2°
2045-12-23 Sat	47	—	unknown	18:40–01:05 (marginal, 6.42 h)	79.2° 19:45	11.5	100%	58.6°
2045-12-24 Sun	70	—	unknown	18:40–21:15 (good, 2.58 h)	79.2° 19:45	11.5	99%	72.5°
2045-12-25 Mon	81	—	unknown	18:40–23:25 (good, 4.75 h)	79.2° 19:40	11.5	95%	86.6°
2045-12-26 Tue	100	—	unknown	18:40–00:40 (good, 6.0 h)	79.2° 19:35	11.49	89%	100.8°
2045-12-27 Wed	100	—	unknown	18:40–00:50 (good, 6.17 h)	79.2° 19:30	11.49	80%	114.9°
2045-12-28 Thu	100	—	unknown	18:40–00:50 (good, 6.17 h)	79.2° 19:25	11.48	70%	128.7°
2045-12-29 Fri	100	—	unknown	18:40–00:50 (good, 6.17 h)	79.2° 19:25	11.48	59%	142.0°
2045-12-30 Sat	100	—	unknown	18:40–00:50 (good, 6.17 h)	79.2° 19:20	11.47	48%	154.4°
2045-12-31 Sun	100	—	unknown	18:45–00:50 (good, 6.08 h)	79.2° 19:15	11.46	37%	163.8°
2046-01-01 Mon	100	—	unknown	18:45–00:45 (good, 6.0 h)	79.2° 19:10	11.45	27%	164.6°
2046-01-02 Tue	100	—	unknown	18:45–00:40 (good, 5.92 h)	79.2° 19:05	11.44	18%	156.3°
2046-01-03 Wed	100	—	unknown	18:45–00:35 (good, 5.83 h)	79.2° 19:05	11.43	11%	145.1°
2046-01-04 Thu	100	—	unknown	18:45–00:30 (good, 5.75 h)	79.2° 19:00	11.41	5%	133.2°
2046-01-05 Fri	100	—	unknown	18:45–00:30 (good, 5.75 h)	79.2° 18:55	11.4	2%	121.1°
2046-01-06 Sat	100	—	unknown	18:50–00:25 (good, 5.58 h)	79.2° 18:50	11.39	0%	109.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-12-08&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.