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: 11-14 (100), 11-15 (100), 11-16 (100), 11-17 (100), 11-18 (100) — by astronomy; check the weather when the night is within four days.

2030-11-12astronomy score per night — click a bar for that night2030-12-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-11-12 Tue	89	—	unknown	18:40–20:35 (good, 1.92 h)	79.1° 22:30	10.87	93%	50.9°
2030-11-13 Wed	96	—	unknown	18:40–23:05 (good, 4.42 h)	79.1° 22:25	10.9	88%	62.1°
2030-11-14 Thu	100	—	unknown	18:40–01:35 (good, 6.92 h)	79.1° 22:20	10.93	81%	73.3°
2030-11-15 Fri	100	—	unknown	18:40–03:00 (good, 8.33 h)	79.1° 22:15	10.96	73%	84.7°
2030-11-16 Sat	100	—	unknown	18:40–03:25 (good, 8.75 h)	79.1° 22:15	10.99	64%	96.3°
2030-11-17 Sun	100	—	unknown	18:40–03:30 (good, 8.83 h)	79.1° 22:10	11.02	54%	108.0°
2030-11-18 Mon	100	—	unknown	18:40–03:30 (good, 8.83 h)	79.1° 22:05	11.04	44%	120.0°
2030-11-19 Tue	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.1° 22:00	11.07	34%	132.1°
2030-11-20 Wed	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.1° 21:55	11.1	24%	144.2°
2030-11-21 Thu	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.1° 21:55	11.12	16%	155.5°
2030-11-22 Fri	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.1° 21:50	11.14	8%	163.2°
2030-11-23 Sat	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.1° 21:45	11.17	3%	160.6°
2030-11-24 Sun	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.1° 21:40	11.19	0%	149.9°
2030-11-25 Mon	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.1° 21:35	11.21	1%	136.5°
2030-11-26 Tue	100	—	unknown	18:35–03:05 (good, 8.5 h)	79.1° 21:35	11.24	4%	122.4°
2030-11-27 Wed	100	—	unknown	18:35–03:00 (good, 8.42 h)	79.1° 21:30	11.26	10%	108.1°
2030-11-28 Thu	100	—	unknown	18:35–03:00 (good, 8.42 h)	79.1° 21:25	11.28	18%	94.0°
2030-11-29 Fri	100	—	unknown	18:35–02:55 (good, 8.33 h)	79.1° 21:20	11.3	28%	80.2°
2030-11-30 Sat	100	—	unknown	18:35–02:50 (good, 8.25 h)	79.1° 21:20	11.31	39%	66.9°
2030-12-01 Sun	97	—	unknown	18:35–02:45 (good, 8.17 h)	79.1° 21:15	11.33	50%	54.2°
2030-12-02 Mon	88	—	unknown	18:35–02:40 (good, 8.08 h)	79.1° 21:10	11.35	60%	42.2°
2030-12-03 Tue	80	—	unknown	02:05–02:40 (good, 0.58 h)	79.1° 21:05	11.36	70%	31.0°
2030-12-04 Wed	50	—	unknown	18:35–02:55 (marginal, 8.33 h)	79.1° 21:00	11.38	78%	21.5°
2030-12-05 Thu	35	—	unknown	18:35–02:40 (marginal, 8.08 h)	79.1° 21:00	11.39	86%	16.5°
2030-12-06 Fri	27	—	unknown	22:25–02:15 (marginal, 3.83 h)	79.1° 20:55	11.41	92%	19.1°
2030-12-07 Sat	24	—	unknown	18:35–20:25 (marginal, 1.83 h)	79.1° 20:50	11.42	96%	27.2°
2030-12-08 Sun	31	—	unknown	18:35–22:00 (marginal, 3.42 h)	79.1° 20:45	11.43	99%	37.3°
2030-12-09 Mon	45	—	unknown	18:35–01:10 (marginal, 6.58 h)	79.1° 20:40	11.44	100%	48.1°
2030-12-10 Tue	65	—	unknown	18:35–19:35 (good, 1.0 h)	79.1° 20:40	11.45	99%	59.2°
2030-12-11 Wed	74	—	unknown	18:35–22:05 (good, 3.5 h)	79.1° 20:35	11.46	96%	70.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-11-12&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.