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: 10-31 (100), 11-01 (100), 11-02 (100), 11-03 (100), 11-04 (100) — by astronomy; check the weather when the night is within four days.

2045-10-21astronomy score per night — click a bar for that night2045-11-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2045-10-21 Sat	94	—	unknown	01:25–06:10 (good, 4.75 h)	79.2° 00:55	10.09	85%	51.4°
2045-10-22 Sun	86	—	unknown	05:05–06:10 (good, 1.08 h)	79.2° 00:50	10.13	91%	40.1°
2045-10-23 Mon	68	—	unknown	06:05–06:15 (good, 0.17 h)	79.2° 00:45	10.17	96%	29.2°
2045-10-24 Tue	34	—	unknown	02:20–06:15 (marginal, 3.92 h)	79.2° 00:45	10.21	99%	19.5°
2045-10-25 Wed	29	—	unknown	20:00–22:30 (marginal, 2.5 h)	79.2° 00:40	10.25	100%	14.6°
2045-10-26 Thu	32	—	unknown	20:00–23:10 (marginal, 3.17 h)	79.2° 00:35	10.29	99%	19.1°
2045-10-27 Fri	39	—	unknown	20:00–00:20 (marginal, 4.33 h)	79.2° 00:30	10.33	95%	29.2°
2045-10-28 Sat	56	—	unknown	19:55–04:35 (marginal, 9.67 h)	79.2° 00:25	10.37	90%	41.2°
2045-10-29 Sun	89	—	unknown	18:55–22:55 (good, 4.0 h)	79.2° 23:25	10.41	82%	53.9°
2045-10-30 Mon	97	—	unknown	18:55–02:25 (good, 7.5 h)	79.2° 23:20	10.44	73%	67.0°
2045-10-31 Tue	100	—	unknown	18:55–04:05 (good, 9.17 h)	79.2° 23:15	10.48	63%	80.3°
2045-11-01 Wed	100	—	unknown	18:50–04:25 (good, 9.58 h)	79.2° 23:10	10.52	52%	93.9°
2045-11-02 Thu	100	—	unknown	18:50–04:30 (good, 9.67 h)	79.2° 23:05	10.55	41%	107.5°
2045-11-03 Fri	100	—	unknown	18:50–04:35 (good, 9.75 h)	79.2° 23:05	10.59	30%	121.2°
2045-11-04 Sat	100	—	unknown	18:50–04:30 (good, 9.67 h)	79.2° 23:00	10.62	20%	134.7°
2045-11-05 Sun	100	—	unknown	18:50–04:25 (good, 9.58 h)	79.2° 22:55	10.66	11%	147.8°
2045-11-06 Mon	100	—	unknown	18:45–04:25 (good, 9.67 h)	79.2° 22:50	10.69	5%	159.4°
2045-11-07 Tue	100	—	unknown	18:45–04:20 (good, 9.58 h)	79.2° 22:50	10.72	1%	165.4°
2045-11-08 Wed	100	—	unknown	18:45–04:15 (good, 9.5 h)	79.2° 22:45	10.76	0%	160.3°
2045-11-09 Thu	100	—	unknown	18:45–04:10 (good, 9.42 h)	79.2° 22:40	10.79	1%	149.5°
2045-11-10 Fri	100	—	unknown	18:45–04:10 (good, 9.42 h)	79.2° 22:35	10.82	5%	137.5°
2045-11-11 Sat	100	—	unknown	18:40–04:05 (good, 9.42 h)	79.2° 22:30	10.85	10%	125.2°
2045-11-12 Sun	100	—	unknown	18:40–04:00 (good, 9.33 h)	79.2° 22:30	10.88	17%	113.1°
2045-11-13 Mon	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.2° 22:25	10.91	25%	101.2°
2045-11-14 Tue	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.2° 22:20	10.94	34%	89.4°
2045-11-15 Wed	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.2° 22:15	10.97	43%	77.9°
2045-11-16 Thu	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.2° 22:10	11.0	53%	66.5°
2045-11-17 Fri	97	—	unknown	18:40–03:40 (good, 9.0 h)	79.2° 22:10	11.03	62%	55.1°
2045-11-18 Sat	89	—	unknown	22:00–03:35 (good, 5.58 h)	79.2° 22:05	11.05	71%	43.9°
2045-11-19 Sun	81	—	unknown	02:55–03:35 (good, 0.67 h)	79.2° 22:00	11.08	79%	32.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-10-21&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.