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: 11-04 (100), 11-05 (100), 11-06 (100), 11-07 (100), 11-08 (100) — by astronomy; check the weather when the night is within four days.

2035-11-04astronomy score per night — click a bar for that night2035-12-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-11-04 Sun	100	—	unknown	18:50–04:35 (good, 9.75 h)	79.1° 23:00	10.6	21%	113.8°
2035-11-05 Mon	100	—	unknown	18:50–04:30 (good, 9.67 h)	79.1° 22:55	10.64	29%	103.1°
2035-11-06 Tue	100	—	unknown	18:45–04:25 (good, 9.67 h)	79.1° 22:55	10.67	38%	92.3°
2035-11-07 Wed	100	—	unknown	18:45–04:20 (good, 9.58 h)	79.1° 22:50	10.7	47%	81.4°
2035-11-08 Thu	100	—	unknown	18:45–04:20 (good, 9.58 h)	79.1° 22:45	10.74	56%	70.4°
2035-11-09 Fri	100	—	unknown	18:45–04:15 (good, 9.5 h)	79.1° 22:40	10.77	66%	59.4°
2035-11-10 Sat	92	—	unknown	22:00–04:10 (good, 6.17 h)	79.1° 22:40	10.8	75%	48.4°
2035-11-11 Sun	84	—	unknown	03:05–04:05 (good, 1.0 h)	79.1° 22:35	10.83	84%	37.9°
2035-11-12 Mon	49	—	unknown	18:40–04:30 (marginal, 9.83 h)	79.1° 22:30	10.86	91%	28.9°
2035-11-13 Tue	34	—	unknown	18:40–04:00 (marginal, 9.33 h)	79.1° 22:25	10.89	96%	23.9°
2035-11-14 Wed	32	—	unknown	18:40–21:40 (marginal, 3.0 h)	79.1° 22:20	10.92	99%	26.1°
2035-11-15 Thu	40	—	unknown	18:40–23:00 (marginal, 4.33 h)	79.1° 22:20	10.95	100%	34.5°
2035-11-16 Fri	58	—	unknown	18:40–03:20 (marginal, 8.67 h)	79.1° 22:15	10.98	97%	46.0°
2035-11-17 Sat	94	—	unknown	18:40–21:45 (good, 3.08 h)	79.2° 22:10	11.01	92%	58.8°
2035-11-18 Sun	100	—	unknown	18:40–01:00 (good, 6.33 h)	79.1° 22:05	11.04	84%	72.0°
2035-11-19 Mon	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.1° 22:00	11.06	75%	85.3°
2035-11-20 Tue	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.1° 22:00	11.09	64%	98.5°
2035-11-21 Wed	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.1° 21:55	11.11	53%	111.2°
2035-11-22 Thu	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.1° 21:50	11.14	42%	123.4°
2035-11-23 Fri	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.1° 21:45	11.16	32%	134.9°
2035-11-24 Sat	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.1° 21:45	11.19	22%	145.1°
2035-11-25 Sun	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.1° 21:40	11.21	15%	152.9°
2035-11-26 Mon	100	—	unknown	18:35–03:05 (good, 8.5 h)	79.1° 21:35	11.23	8%	156.2°
2035-11-27 Tue	100	—	unknown	18:35–03:05 (good, 8.5 h)	79.1° 21:30	11.25	4%	153.6°
2035-11-28 Wed	100	—	unknown	18:35–03:00 (good, 8.42 h)	79.1° 21:25	11.27	1%	146.6°
2035-11-29 Thu	100	—	unknown	18:35–02:55 (good, 8.33 h)	79.1° 21:25	11.29	0%	137.5°
2035-11-30 Fri	100	—	unknown	18:35–02:50 (good, 8.25 h)	79.1° 21:20	11.31	1%	127.4°
2035-12-01 Sat	100	—	unknown	18:35–02:45 (good, 8.17 h)	79.2° 21:15	11.33	4%	116.9°
2035-12-02 Sun	100	—	unknown	18:35–02:45 (good, 8.17 h)	79.1° 21:10	11.34	9%	106.3°
2035-12-03 Mon	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.1° 21:05	11.36	15%	95.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-11-04&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.