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), 12-07 (100), 12-08 (100), 12-09 (100) — by astronomy; check the weather when the night is within four days.

2047-11-26astronomy score per night — click a bar for that night2047-12-25

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-11-26 Tue	81	—	unknown	02:30–03:10 (good, 0.67 h)	79.2° 21:35	11.23	74%	32.0°
2047-11-27 Wed	49	—	unknown	18:35–03:25 (marginal, 8.83 h)	79.2° 21:30	11.25	82%	22.1°
2047-11-28 Thu	35	—	unknown	18:35–03:10 (marginal, 8.58 h)	79.2° 21:25	11.27	89%	15.4°
2047-11-29 Fri	26	—	unknown	23:45–02:45 (marginal, 3.0 h)	79.2° 21:25	11.29	94%	16.2°
2047-11-30 Sat	24	—	unknown	18:35–20:20 (marginal, 1.75 h)	79.2° 21:20	11.31	98%	23.8°
2047-12-01 Sun	28	—	unknown	18:35–21:15 (marginal, 2.67 h)	79.2° 21:15	11.33	100%	33.8°
2047-12-02 Mon	44	—	unknown	18:35–00:30 (marginal, 5.92 h)	79.2° 21:10	11.35	100%	44.7°
2047-12-03 Tue	64	—	unknown	18:35–19:35 (good, 1.0 h)	79.2° 21:05	11.36	98%	56.0°
2047-12-04 Wed	74	—	unknown	18:35–22:00 (good, 3.42 h)	79.2° 21:05	11.38	95%	67.6°
2047-12-05 Thu	100	—	unknown	18:35–00:20 (good, 5.75 h)	79.2° 21:00	11.39	90%	79.4°
2047-12-06 Fri	100	—	unknown	18:35–01:40 (good, 7.08 h)	79.2° 20:55	11.41	83%	91.3°
2047-12-07 Sat	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.2° 20:50	11.42	74%	103.5°
2047-12-08 Sun	100	—	unknown	18:35–02:10 (good, 7.58 h)	79.2° 20:50	11.43	65%	115.9°
2047-12-09 Mon	100	—	unknown	18:35–02:10 (good, 7.58 h)	79.2° 20:45	11.44	55%	128.4°
2047-12-10 Tue	100	—	unknown	18:35–02:10 (good, 7.58 h)	79.2° 20:40	11.45	44%	141.1°
2047-12-11 Wed	100	—	unknown	18:35–02:10 (good, 7.58 h)	79.2° 20:35	11.46	33%	153.3°
2047-12-12 Thu	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.2° 20:30	11.47	22%	163.2°
2047-12-13 Fri	100	—	unknown	18:35–02:00 (good, 7.42 h)	79.2° 20:30	11.48	14%	164.1°
2047-12-14 Sat	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.2° 20:25	11.48	6%	154.4°
2047-12-15 Sun	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.2° 20:20	11.49	2%	141.2°
2047-12-16 Mon	100	—	unknown	18:35–01:50 (good, 7.25 h)	79.2° 20:15	11.5	0%	127.1°
2047-12-17 Tue	100	—	unknown	18:35–01:45 (good, 7.17 h)	79.2° 20:10	11.5	1%	112.8°
2047-12-18 Wed	100	—	unknown	18:35–01:40 (good, 7.08 h)	79.2° 20:10	11.5	5%	98.6°
2047-12-19 Thu	100	—	unknown	18:35–01:35 (good, 7.0 h)	79.2° 20:05	11.51	12%	84.8°
2047-12-20 Fri	100	—	unknown	18:35–01:35 (good, 7.0 h)	79.2° 20:00	11.51	20%	71.5°
2047-12-21 Sat	100	—	unknown	18:35–01:30 (good, 6.92 h)	79.2° 19:55	11.51	29%	58.7°
2047-12-22 Sun	92	—	unknown	18:35–01:25 (good, 6.83 h)	79.2° 19:55	11.51	39%	46.5°
2047-12-23 Mon	84	—	unknown	18:40–01:20 (good, 6.67 h)	79.2° 19:50	11.51	48%	35.0°
2047-12-24 Tue	64	—	unknown	20:55–00:35 (good, 3.67 h)	79.2° 19:45	11.5	58%	24.6°
2047-12-25 Wed	50	—	unknown	18:40–01:40 (marginal, 7.0 h)	79.2° 19:40	11.5	68%	16.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-11-26&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.