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: 11-15 (100), 11-16 (100), 11-17 (100), 11-18 (100), 11-19 (100) — by astronomy; check the weather when the night is within four days.

2036-11-15astronomy score per night — click a bar for that night2036-12-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-11-15 Sat	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.2° 22:15	10.98	5%	155.1°
2036-11-16 Sun	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.2° 22:10	11.0	2%	154.3°
2036-11-17 Mon	100	—	unknown	18:40–03:40 (good, 9.0 h)	79.1° 22:05	11.03	0%	147.6°
2036-11-18 Tue	100	—	unknown	18:35–03:35 (good, 9.0 h)	79.1° 22:05	11.06	1%	138.1°
2036-11-19 Wed	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.2° 22:00	11.08	4%	127.3°
2036-11-20 Thu	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.2° 21:55	11.11	9%	116.3°
2036-11-21 Fri	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.2° 21:50	11.13	15%	105.1°
2036-11-22 Sat	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.1° 21:45	11.16	23%	94.1°
2036-11-23 Sun	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.2° 21:45	11.18	32%	83.2°
2036-11-24 Mon	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.2° 21:40	11.2	40%	72.5°
2036-11-25 Tue	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.2° 21:35	11.23	50%	61.9°
2036-11-26 Wed	95	—	unknown	18:35–03:05 (good, 8.5 h)	79.1° 21:30	11.25	59%	51.6°
2036-11-27 Thu	87	—	unknown	21:10–03:00 (good, 5.83 h)	79.1° 21:30	11.27	68%	41.7°
2036-11-28 Fri	73	—	unknown	02:35–02:55 (good, 0.33 h)	79.2° 21:25	11.29	77%	32.8°
2036-11-29 Sat	45	—	unknown	18:35–03:10 (marginal, 8.58 h)	79.2° 21:20	11.31	85%	26.3°
2036-11-30 Sun	33	—	unknown	18:35–02:50 (marginal, 8.25 h)	79.2° 21:15	11.32	92%	24.6°
2036-12-01 Mon	29	—	unknown	18:35–21:20 (marginal, 2.75 h)	79.1° 21:10	11.34	96%	28.9°
2036-12-02 Tue	36	—	unknown	18:35–23:10 (marginal, 4.58 h)	79.1° 21:10	11.36	99%	37.7°
2036-12-03 Wed	52	—	unknown	18:35–02:10 (marginal, 7.58 h)	79.2° 21:05	11.37	100%	48.7°
2036-12-04 Thu	69	—	unknown	18:35–20:25 (good, 1.83 h)	79.2° 21:00	11.39	98%	60.9°
2036-12-05 Fri	100	—	unknown	18:35–23:30 (good, 4.92 h)	79.2° 20:55	11.4	93%	73.8°
2036-12-06 Sat	100	—	unknown	18:35–01:05 (good, 6.5 h)	79.1° 20:50	11.41	86%	86.9°
2036-12-07 Sun	100	—	unknown	18:35–02:00 (good, 7.42 h)	79.2° 20:50	11.43	77%	100.0°
2036-12-08 Mon	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.2° 20:45	11.44	66%	112.9°
2036-12-09 Tue	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.2° 20:40	11.45	55%	125.4°
2036-12-10 Wed	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.2° 20:35	11.46	44%	137.0°
2036-12-11 Thu	100	—	unknown	18:35–02:05 (good, 7.5 h)	79.1° 20:35	11.47	33%	147.2°
2036-12-12 Fri	100	—	unknown	18:35–02:00 (good, 7.42 h)	79.2° 20:30	11.48	23%	154.0°
2036-12-13 Sat	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.2° 20:25	11.48	15%	155.1°
2036-12-14 Sun	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.2° 20:20	11.49	8%	150.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-11-15&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.