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.

2045-11-04astronomy score per night — click a bar for that night2045-12-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2045-11-20 Mon	47	—	unknown	18:35–03:50 (marginal, 9.25 h)	79.2° 21:55	11.1	86%	22.5°
2045-11-21 Tue	32	—	unknown	22:00–03:30 (marginal, 5.5 h)	79.2° 21:55	11.13	93%	15.3°
2045-11-22 Wed	25	—	unknown	18:35–20:25 (marginal, 1.83 h)	79.2° 21:50	11.15	97%	16.5°
2045-11-23 Thu	25	—	unknown	18:35–20:35 (marginal, 2.0 h)	79.2° 21:45	11.18	99%	25.6°
2045-11-24 Fri	36	—	unknown	18:35–22:35 (marginal, 4.0 h)	79.2° 21:40	11.2	100%	37.4°
2045-11-25 Sat	59	—	unknown	18:35–02:45 (marginal, 8.17 h)	79.2° 21:35	11.22	97%	50.2°
2045-11-26 Sun	71	—	unknown	18:35–21:50 (good, 3.25 h)	79.2° 21:35	11.24	93%	63.5°
2045-11-27 Mon	100	—	unknown	18:35–00:45 (good, 6.17 h)	79.2° 21:30	11.26	86%	77.1°
2045-11-28 Tue	100	—	unknown	18:35–02:25 (good, 7.83 h)	79.2° 21:25	11.28	77%	90.9°
2045-11-29 Wed	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.2° 21:20	11.3	67%	104.6°
2045-11-30 Thu	100	—	unknown	18:35–02:45 (good, 8.17 h)	79.2° 21:15	11.32	56%	118.3°
2045-12-01 Fri	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.2° 21:15	11.34	44%	131.7°
2045-12-02 Sat	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.2° 21:10	11.35	33%	144.7°
2045-12-03 Sun	100	—	unknown	18:35–02:40 (good, 8.08 h)	79.2° 21:05	11.37	23%	156.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-11-04&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.