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: 10-29 (100), 10-30 (100), 10-31 (100), 11-01 (100), 11-02 (100) — by astronomy; check the weather when the night is within four days.

2030-10-29astronomy score per night — click a bar for that night2030-11-27

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-10-29 Tue	100	—	unknown	18:55–04:55 (good, 10.0 h)	79.1° 23:25	10.39	13%	130.6°
2030-10-30 Wed	100	—	unknown	18:55–04:50 (good, 9.92 h)	79.1° 23:20	10.43	22%	116.8°
2030-10-31 Thu	100	—	unknown	18:55–04:50 (good, 9.92 h)	79.1° 23:15	10.47	32%	103.1°
2030-11-01 Fri	100	—	unknown	18:50–04:45 (good, 9.92 h)	79.1° 23:10	10.5	44%	89.6°
2030-11-02 Sat	100	—	unknown	18:50–04:40 (good, 9.83 h)	79.1° 23:10	10.54	55%	76.5°
2030-11-03 Sun	100	—	unknown	18:50–04:35 (good, 9.75 h)	79.1° 23:05	10.57	65%	63.7°
2030-11-04 Mon	94	—	unknown	21:45–04:30 (good, 6.75 h)	79.1° 23:00	10.61	75%	51.3°
2030-11-05 Tue	86	—	unknown	03:10–04:30 (good, 1.33 h)	79.1° 22:55	10.64	83%	39.5°
2030-11-06 Wed	65	—	unknown	04:15–04:25 (good, 0.17 h)	79.1° 22:50	10.68	90%	28.6°
2030-11-07 Thu	37	—	unknown	23:20–04:30 (marginal, 5.17 h)	79.1° 22:50	10.71	95%	19.8°
2030-11-08 Fri	28	—	unknown	01:45–04:10 (marginal, 2.42 h)	79.1° 22:45	10.74	98%	16.4°
2030-11-09 Sat	29	—	unknown	18:45–21:15 (marginal, 2.5 h)	79.1° 22:40	10.78	100%	20.9°
2030-11-10 Sun	33	—	unknown	18:45–21:55 (marginal, 3.17 h)	79.1° 22:35	10.81	99%	29.7°
2030-11-11 Mon	51	—	unknown	18:45–01:30 (marginal, 6.75 h)	79.1° 22:35	10.84	97%	40.0°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-10-29&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.