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: 11-07 (100), 11-08 (100), 11-09 (100), 11-10 (100), 11-11 (100) — by astronomy; check the weather when the night is within four days.

2028-10-31astronomy score per night — click a bar for that night2028-11-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2028-10-31 Tue	33	—	unknown	00:50–04:50 (marginal, 4.0 h)	79.1° 23:15	10.48	98%	17.7°
2028-11-01 Wed	28	—	unknown	18:50–21:05 (marginal, 2.25 h)	79.1° 23:10	10.52	100%	14.7°
2028-11-02 Thu	30	—	unknown	18:50–21:40 (marginal, 2.83 h)	79.1° 23:05	10.56	100%	20.2°
2028-11-03 Fri	36	—	unknown	18:50–22:35 (marginal, 3.75 h)	79.1° 23:00	10.59	98%	30.1°
2028-11-04 Sat	55	—	unknown	18:50–03:20 (marginal, 8.5 h)	79.1° 23:00	10.63	94%	41.5°
2028-11-05 Sun	89	—	unknown	18:50–21:55 (good, 3.08 h)	79.1° 22:55	10.66	88%	53.5°
2028-11-06 Mon	97	—	unknown	18:45–01:25 (good, 6.67 h)	79.1° 22:50	10.69	80%	66.0°
2028-11-07 Tue	100	—	unknown	18:45–03:05 (good, 8.33 h)	79.1° 22:45	10.73	71%	78.8°
2028-11-08 Wed	100	—	unknown	18:45–03:55 (good, 9.17 h)	79.1° 22:40	10.76	61%	91.9°
2028-11-09 Thu	100	—	unknown	18:45–04:00 (good, 9.25 h)	79.1° 22:40	10.79	50%	105.2°
2028-11-10 Fri	100	—	unknown	18:45–04:00 (good, 9.25 h)	79.1° 22:35	10.82	38%	118.7°
2028-11-11 Sat	100	—	unknown	18:40–04:00 (good, 9.33 h)	79.1° 22:30	10.86	28%	132.3°
2028-11-12 Sun	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.1° 22:25	10.89	18%	145.7°
2028-11-13 Mon	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.1° 22:25	10.92	10%	158.0°
2028-11-14 Tue	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.1° 22:20	10.95	4%	165.3°
2028-11-15 Wed	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.1° 22:15	10.97	1%	160.9°
2028-11-16 Thu	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.1° 22:10	11.0	0%	149.5°
2028-11-17 Fri	100	—	unknown	18:40–03:40 (good, 9.0 h)	79.1° 22:05	11.03	2%	136.7°
2028-11-18 Sat	100	—	unknown	18:35–03:35 (good, 9.0 h)	79.1° 22:05	11.06	7%	123.6°
2028-11-19 Sun	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.1° 22:00	11.08	14%	110.7°
2028-11-20 Mon	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.1° 21:55	11.11	21%	98.2°
2028-11-21 Tue	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.1° 21:50	11.13	30%	85.9°
2028-11-22 Wed	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.1° 21:45	11.16	40%	74.1°
2028-11-23 Thu	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.1° 21:45	11.18	49%	62.4°
2028-11-24 Fri	94	—	unknown	18:35–03:10 (good, 8.58 h)	79.1° 21:40	11.2	59%	51.1°
2028-11-25 Sat	86	—	unknown	21:55–03:10 (good, 5.25 h)	79.1° 21:35	11.22	68%	40.0°
2028-11-26 Sun	75	—	unknown	02:40–03:05 (good, 0.42 h)	79.1° 21:30	11.25	76%	29.4°
2028-11-27 Mon	45	—	unknown	18:35–03:20 (marginal, 8.75 h)	79.1° 21:30	11.27	84%	20.0°
2028-11-28 Tue	31	—	unknown	18:35–03:00 (marginal, 8.42 h)	79.1° 21:25	11.29	90%	14.6°
2028-11-29 Wed	25	—	unknown	18:35–20:25 (marginal, 1.83 h)	79.1° 21:20	11.3	95%	17.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2028-10-31&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.