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: 11-17 (100), 11-18 (100), 11-19 (100), 11-20 (100), 11-21 (100) — by astronomy; check the weather when the night is within four days.

2046-11-10astronomy score per night — click a bar for that night2046-12-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-11-10 Sat	41	—	unknown	18:45–04:25 (marginal, 9.67 h)	79.2° 22:35	10.81	93%	20.9°
2046-11-11 Sun	29	—	unknown	00:40–04:05 (marginal, 3.42 h)	79.2° 22:35	10.84	97%	14.7°
2046-11-12 Mon	26	—	unknown	18:40–20:45 (marginal, 2.08 h)	79.2° 22:30	10.87	99%	16.7°
2046-11-13 Tue	28	—	unknown	18:40–21:15 (marginal, 2.58 h)	79.2° 22:25	10.91	100%	25.1°
2046-11-14 Wed	40	—	unknown	18:40–23:05 (marginal, 4.42 h)	79.2° 22:20	10.93	98%	35.9°
2046-11-15 Thu	58	—	unknown	18:40–03:25 (marginal, 8.75 h)	79.2° 22:15	10.96	95%	47.5°
2046-11-16 Fri	93	—	unknown	18:40–22:00 (good, 3.33 h)	79.2° 22:15	10.99	90%	59.5°
2046-11-17 Sat	100	—	unknown	18:40–01:05 (good, 6.42 h)	79.2° 22:10	11.02	83%	72.0°
2046-11-18 Sun	100	—	unknown	18:40–02:40 (good, 8.0 h)	79.2° 22:05	11.05	74%	84.7°
2046-11-19 Mon	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.2° 22:00	11.07	64%	97.6°
2046-11-20 Tue	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.2° 22:00	11.1	54%	110.8°
2046-11-21 Wed	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.2° 21:55	11.12	43%	124.1°
2046-11-22 Thu	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.2° 21:50	11.15	32%	137.5°
2046-11-23 Fri	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.2° 21:45	11.17	21%	150.6°
2046-11-24 Sat	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.2° 21:40	11.19	12%	161.8°
2046-11-25 Sun	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.2° 21:40	11.22	6%	165.3°
2046-11-26 Mon	100	—	unknown	18:35–03:05 (good, 8.5 h)	79.2° 21:35	11.24	2%	157.0°
2046-11-27 Tue	100	—	unknown	18:35–03:05 (good, 8.5 h)	79.2° 21:30	11.26	0%	144.5°
2046-11-28 Wed	100	—	unknown	18:35–03:00 (good, 8.42 h)	79.2° 21:25	11.28	1%	131.2°
2046-11-29 Thu	100	—	unknown	18:35–02:55 (good, 8.33 h)	79.2° 21:20	11.3	5%	117.8°
2046-11-30 Fri	100	—	unknown	18:35–02:50 (good, 8.25 h)	79.2° 21:20	11.32	11%	104.6°
2046-12-01 Sat	100	—	unknown	18:35–02:45 (good, 8.17 h)	79.2° 21:15	11.33	19%	91.8°
2046-12-02 Sun	100	—	unknown	18:35–02:45 (good, 8.17 h)	79.2° 21:10	11.35	27%	79.4°
2046-12-03 Mon	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.2° 21:05	11.37	36%	67.4°
2046-12-04 Tue	98	—	unknown	18:35–02:35 (good, 8.0 h)	79.2° 21:05	11.38	46%	55.7°
2046-12-05 Wed	90	—	unknown	18:35–02:30 (good, 7.92 h)	79.2° 21:00	11.4	56%	44.4°
2046-12-06 Thu	82	—	unknown	22:10–02:25 (good, 4.25 h)	79.2° 20:55	11.41	65%	33.5°
2046-12-07 Fri	54	—	unknown	18:35–02:50 (marginal, 8.25 h)	79.2° 20:50	11.42	74%	23.5°
2046-12-08 Sat	40	—	unknown	18:35–02:35 (marginal, 8.0 h)	79.2° 20:45	11.43	81%	15.8°
2046-12-09 Sun	28	—	unknown	18:35–02:15 (marginal, 7.67 h)	79.2° 20:45	11.44	88%	15.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-11-10&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.