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: 11-09 (100), 11-10 (100), 11-11 (100), 11-12 (100), 11-13 (100) — by astronomy; check the weather when the night is within four days.

2044-11-02astronomy score per night — click a bar for that night2044-12-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-11-02 Wed	72	—	unknown	04:20–04:40 (good, 0.33 h)	79.2° 23:05	10.56	92%	30.1°
2044-11-03 Thu	36	—	unknown	00:05–04:45 (marginal, 4.67 h)	79.2° 23:00	10.6	97%	19.8°
2044-11-04 Fri	28	—	unknown	18:50–21:00 (marginal, 2.17 h)	79.2° 23:00	10.63	99%	15.3°
2044-11-05 Sat	30	—	unknown	18:45–21:30 (marginal, 2.75 h)	79.2° 22:55	10.66	100%	21.6°
2044-11-06 Sun	39	—	unknown	18:45–23:10 (marginal, 4.42 h)	79.2° 22:50	10.7	97%	33.2°
2044-11-07 Mon	58	—	unknown	18:45–03:55 (marginal, 9.17 h)	79.2° 22:45	10.73	92%	46.5°
2044-11-08 Tue	92	—	unknown	18:45–23:15 (good, 4.5 h)	79.2° 22:45	10.76	84%	60.3°
2044-11-09 Wed	100	—	unknown	18:45–02:15 (good, 7.5 h)	79.2° 22:40	10.8	75%	74.2°
2044-11-10 Thu	100	—	unknown	18:45–03:40 (good, 8.92 h)	79.2° 22:35	10.83	65%	88.1°
2044-11-11 Fri	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.2° 22:30	10.86	53%	101.7°
2044-11-12 Sat	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.2° 22:25	10.89	42%	115.1°
2044-11-13 Sun	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.2° 22:25	10.92	32%	128.1°
2044-11-14 Mon	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.2° 22:20	10.95	22%	140.6°
2044-11-15 Tue	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.2° 22:15	10.98	14%	152.2°
2044-11-16 Wed	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.2° 22:10	11.01	8%	161.6°
2044-11-17 Thu	100	—	unknown	18:40–03:40 (good, 9.0 h)	79.2° 22:05	11.03	3%	164.6°
2044-11-18 Fri	100	—	unknown	18:35–03:35 (good, 9.0 h)	79.2° 22:05	11.06	1%	158.7°
2044-11-19 Sat	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.2° 22:00	11.09	0%	148.8°
2044-11-20 Sun	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.2° 21:55	11.11	2%	137.8°
2044-11-21 Mon	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.2° 21:50	11.14	5%	126.5°
2044-11-22 Tue	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.2° 21:50	11.16	10%	115.2°
2044-11-23 Wed	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.2° 21:45	11.18	16%	103.8°
2044-11-24 Thu	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.2° 21:40	11.2	24%	92.4°
2044-11-25 Fri	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.2° 21:35	11.23	32%	81.0°
2044-11-26 Sat	100	—	unknown	18:35–03:05 (good, 8.5 h)	79.2° 21:30	11.25	41%	69.5°
2044-11-27 Sun	99	—	unknown	18:35–03:00 (good, 8.42 h)	79.2° 21:30	11.27	51%	57.9°
2044-11-28 Mon	91	—	unknown	18:35–02:55 (good, 8.33 h)	79.2° 21:25	11.29	61%	46.2°
2044-11-29 Tue	83	—	unknown	23:15–02:55 (good, 3.67 h)	79.2° 21:20	11.31	70%	34.6°
2044-11-30 Wed	51	—	unknown	18:35–03:20 (marginal, 8.75 h)	79.2° 21:15	11.32	80%	23.7°
2044-12-01 Thu	35	—	unknown	18:35–02:55 (marginal, 8.33 h)	79.2° 21:10	11.34	88%	15.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-11-02&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.