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: 11-08 (100), 11-09 (100), 11-10 (100), 11-11 (100), 11-12 (100) — by astronomy; check the weather when the night is within four days.

2042-11-08astronomy score per night — click a bar for that night2042-12-07

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2042-11-08 Sat	100	—	unknown	18:45–04:15 (good, 9.5 h)	79.2° 22:45	10.75	13%	144.8°
2042-11-09 Sun	100	—	unknown	18:45–04:15 (good, 9.5 h)	79.2° 22:40	10.78	8%	154.1°
2042-11-10 Mon	100	—	unknown	18:45–04:10 (good, 9.42 h)	79.2° 22:35	10.81	3%	160.7°
2042-11-11 Tue	100	—	unknown	18:45–04:05 (good, 9.33 h)	79.2° 22:35	10.84	1%	161.5°
2042-11-12 Wed	100	—	unknown	18:40–04:00 (good, 9.33 h)	79.2° 22:30	10.87	0%	155.8°
2042-11-13 Thu	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.2° 22:25	10.9	1%	146.7°
2042-11-14 Fri	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.2° 22:20	10.93	4%	136.2°
2042-11-15 Sat	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.2° 22:15	10.96	9%	124.9°
2042-11-16 Sun	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.2° 22:15	10.99	15%	113.3°
2042-11-17 Mon	100	—	unknown	18:40–03:40 (good, 9.0 h)	79.2° 22:10	11.02	23%	101.3°
2042-11-18 Tue	100	—	unknown	18:40–03:40 (good, 9.0 h)	79.2° 22:05	11.05	32%	89.0°
2042-11-19 Wed	100	—	unknown	18:35–03:35 (good, 9.0 h)	79.2° 22:00	11.07	43%	76.5°
2042-11-20 Thu	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.2° 21:55	11.1	54%	63.8°
2042-11-21 Fri	94	—	unknown	18:35–03:25 (good, 8.83 h)	79.2° 21:55	11.12	64%	50.8°
2042-11-22 Sat	84	—	unknown	23:45–03:20 (good, 3.58 h)	79.2° 21:50	11.15	75%	38.1°
2042-11-23 Sun	49	—	unknown	18:35–03:45 (marginal, 9.17 h)	79.2° 21:45	11.17	84%	26.3°
2042-11-24 Mon	32	—	unknown	18:35–03:20 (marginal, 8.75 h)	79.2° 21:40	11.19	92%	18.4°
2042-11-25 Tue	26	—	unknown	18:35–20:35 (marginal, 2.0 h)	79.2° 21:40	11.22	97%	20.5°
2042-11-26 Wed	26	—	unknown	18:35–20:55 (marginal, 2.33 h)	79.2° 21:35	11.24	100%	30.7°
2042-11-27 Thu	44	—	unknown	18:35–00:30 (marginal, 5.92 h)	79.2° 21:30	11.26	99%	43.4°
2042-11-28 Fri	64	—	unknown	18:35–20:05 (good, 1.5 h)	79.2° 21:25	11.28	96%	56.8°
2042-11-29 Sat	98	—	unknown	18:35–23:30 (good, 4.92 h)	79.2° 21:20	11.3	90%	70.2°
2042-11-30 Sun	100	—	unknown	18:35–01:20 (good, 6.75 h)	79.2° 21:20	11.32	83%	83.3°
2042-12-01 Mon	100	—	unknown	18:35–02:25 (good, 7.83 h)	79.2° 21:15	11.33	74%	96.0°
2042-12-02 Tue	100	—	unknown	18:35–02:30 (good, 7.92 h)	79.2° 21:10	11.35	64%	108.2°
2042-12-03 Wed	100	—	unknown	18:35–02:35 (good, 8.0 h)	79.2° 21:05	11.37	55%	120.0°
2042-12-04 Thu	100	—	unknown	18:35–02:30 (good, 7.92 h)	79.2° 21:00	11.38	45%	131.3°
2042-12-05 Fri	100	—	unknown	18:35–02:30 (good, 7.92 h)	79.2° 21:00	11.4	36%	142.0°
2042-12-06 Sat	100	—	unknown	18:35–02:25 (good, 7.83 h)	79.2° 20:55	11.41	27%	151.8°
2042-12-07 Sun	100	—	unknown	18:35–02:25 (good, 7.83 h)	79.2° 20:50	11.42	19%	159.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-11-08&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.