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: 11-21 (100), 11-22 (100), 11-23 (100), 11-24 (100), 11-25 (100) — by astronomy; check the weather when the night is within four days.

2044-11-21astronomy score per night — click a bar for that night2044-12-20

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-11-21 Mon	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.2° 21:50	11.14	5%	126.5°
2044-11-22 Tue	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.2° 21:50	11.16	10%	115.2°
2044-11-23 Wed	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.2° 21:45	11.18	16%	103.8°
2044-11-24 Thu	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.2° 21:40	11.2	24%	92.4°
2044-11-25 Fri	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.2° 21:35	11.23	32%	81.0°
2044-11-26 Sat	100	—	unknown	18:35–03:05 (good, 8.5 h)	79.2° 21:30	11.25	41%	69.5°
2044-11-27 Sun	99	—	unknown	18:35–03:00 (good, 8.42 h)	79.2° 21:30	11.27	51%	57.9°
2044-11-28 Mon	91	—	unknown	18:35–02:55 (good, 8.33 h)	79.2° 21:25	11.29	61%	46.2°
2044-11-29 Tue	83	—	unknown	23:15–02:55 (good, 3.67 h)	79.2° 21:20	11.31	70%	34.6°
2044-11-30 Wed	51	—	unknown	18:35–03:20 (marginal, 8.75 h)	79.2° 21:15	11.32	80%	23.7°
2044-12-01 Thu	35	—	unknown	18:35–02:55 (marginal, 8.33 h)	79.2° 21:10	11.34	88%	15.9°
2044-12-02 Fri	25	—	unknown	18:35–20:30 (marginal, 1.92 h)	79.2° 21:10	11.36	94%	17.7°
2044-12-03 Sat	23	—	unknown	18:35–20:15 (marginal, 1.67 h)	79.2° 21:05	11.37	98%	27.9°
2044-12-04 Sun	35	—	unknown	18:35–23:00 (marginal, 4.42 h)	79.2° 21:00	11.39	100%	40.9°
2044-12-05 Mon	59	—	unknown	18:35–19:00 (good, 0.42 h)	79.2° 20:55	11.4	98%	54.9°
2044-12-06 Tue	74	—	unknown	18:35–22:10 (good, 3.58 h)	79.2° 20:55	11.42	94%	69.3°
2044-12-07 Wed	100	—	unknown	18:35–00:40 (good, 6.08 h)	79.2° 20:50	11.43	88%	83.7°
2044-12-08 Thu	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.2° 20:45	11.44	79%	98.0°
2044-12-09 Fri	100	—	unknown	18:35–02:00 (good, 7.42 h)	79.2° 20:40	11.45	68%	111.8°
2044-12-10 Sat	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.2° 20:35	11.46	58%	125.3°
2044-12-11 Sun	100	—	unknown	18:35–02:00 (good, 7.42 h)	79.2° 20:35	11.47	47%	138.1°
2044-12-12 Mon	100	—	unknown	18:35–02:00 (good, 7.42 h)	79.2° 20:30	11.48	36%	150.0°
2044-12-13 Tue	100	—	unknown	18:35–02:00 (good, 7.42 h)	79.2° 20:25	11.48	26%	160.0°
2044-12-14 Wed	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.2° 20:20	11.49	18%	164.9°
2044-12-15 Thu	100	—	unknown	18:35–01:50 (good, 7.25 h)	79.2° 20:15	11.49	11%	160.8°
2044-12-16 Fri	100	—	unknown	18:35–01:45 (good, 7.17 h)	79.2° 20:15	11.5	6%	151.6°
2044-12-17 Sat	100	—	unknown	18:35–01:40 (good, 7.08 h)	79.2° 20:10	11.5	2%	140.8°
2044-12-18 Sun	100	—	unknown	18:35–01:40 (good, 7.08 h)	79.2° 20:05	11.51	0%	129.6°
2044-12-19 Mon	100	—	unknown	18:35–01:35 (good, 7.0 h)	79.2° 20:00	11.51	0%	118.2°
2044-12-20 Tue	100	—	unknown	18:35–01:30 (good, 6.92 h)	79.2° 20:00	11.51	2%	106.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-11-21&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.