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: 11-10 (100), 11-11 (100), 11-12 (100), 11-13 (100), 11-14 (100) — by astronomy; check the weather when the night is within four days.

2047-11-10astronomy score per night — click a bar for that night2047-12-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-11-10 Sun	100	—	unknown	18:45–04:00 (good, 9.25 h)	79.2° 22:40	10.81	49%	106.6°
2047-11-11 Mon	100	—	unknown	18:45–04:00 (good, 9.25 h)	79.2° 22:35	10.84	38%	119.3°
2047-11-12 Tue	100	—	unknown	18:40–04:00 (good, 9.33 h)	79.2° 22:30	10.87	28%	132.3°
2047-11-13 Wed	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.2° 22:25	10.9	18%	145.3°
2047-11-14 Thu	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.2° 22:20	10.93	10%	157.5°
2047-11-15 Fri	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.2° 22:20	10.96	4%	165.1°
2047-11-16 Sat	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.2° 22:15	10.98	1%	160.5°
2047-11-17 Sun	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.2° 22:10	11.01	0%	148.5°
2047-11-18 Mon	100	—	unknown	18:40–03:40 (good, 9.0 h)	79.2° 22:05	11.04	3%	134.7°
2047-11-19 Tue	100	—	unknown	18:35–03:35 (good, 9.0 h)	79.2° 22:00	11.07	8%	120.5°
2047-11-20 Wed	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.2° 22:00	11.09	16%	106.5°
2047-11-21 Thu	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.2° 21:55	11.12	25%	92.8°
2047-11-22 Fri	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.2° 21:50	11.14	35%	79.6°
2047-11-23 Sat	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.2° 21:45	11.17	46%	66.9°
2047-11-24 Sun	97	—	unknown	18:35–03:15 (good, 8.67 h)	79.2° 21:45	11.19	56%	54.7°
2047-11-25 Mon	89	—	unknown	20:05–03:10 (good, 7.08 h)	79.2° 21:40	11.21	65%	43.0°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-11-10&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.