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: 11-18 (100), 11-19 (100), 11-20 (100), 11-21 (100), 11-22 (100) — by astronomy; check the weather when the night is within four days.

2033-11-18astronomy score per night — click a bar for that night2033-12-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-11-18 Fri	100	—	unknown	18:40–03:35 (good, 8.92 h)	79.1° 22:05	11.05	9%	157.1°
2033-11-19 Sat	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.1° 22:00	11.08	4%	158.6°
2033-11-20 Sun	100	—	unknown	18:35–03:30 (good, 8.92 h)	79.1° 21:55	11.1	1%	154.3°
2033-11-21 Mon	100	—	unknown	18:35–03:25 (good, 8.83 h)	79.1° 21:50	11.13	0%	146.2°
2033-11-22 Tue	100	—	unknown	18:35–03:20 (good, 8.75 h)	79.1° 21:50	11.15	1%	136.3°
2033-11-23 Wed	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.1° 21:45	11.17	4%	125.5°
2033-11-24 Thu	100	—	unknown	18:35–03:15 (good, 8.67 h)	79.1° 21:40	11.2	8%	114.1°
2033-11-25 Fri	100	—	unknown	18:35–03:10 (good, 8.58 h)	79.1° 21:35	11.22	14%	102.3°
2033-11-26 Sat	100	—	unknown	18:35–03:05 (good, 8.5 h)	79.1° 21:35	11.24	22%	90.2°
2033-11-27 Sun	100	—	unknown	18:35–03:00 (good, 8.42 h)	79.1° 21:30	11.26	32%	78.0°
2033-11-28 Mon	100	—	unknown	18:35–02:55 (good, 8.33 h)	79.1° 21:25	11.28	42%	65.5°
2033-11-29 Tue	96	—	unknown	18:35–02:55 (good, 8.33 h)	79.1° 21:20	11.3	53%	53.1°
2033-11-30 Wed	87	—	unknown	19:00–02:50 (good, 7.83 h)	79.1° 21:15	11.32	64%	41.0°
2033-12-01 Thu	69	—	unknown	02:30–02:45 (good, 0.25 h)	79.1° 21:15	11.34	75%	29.9°
2033-12-02 Fri	42	—	unknown	18:35–03:00 (marginal, 8.42 h)	79.1° 21:10	11.35	84%	22.3°
2033-12-03 Sat	30	—	unknown	18:35–02:35 (marginal, 8.0 h)	79.1° 21:05	11.37	92%	22.6°
2033-12-04 Sun	27	—	unknown	18:35–21:05 (marginal, 2.5 h)	79.1° 21:00	11.38	97%	30.7°
2033-12-05 Mon	40	—	unknown	18:35–00:20 (marginal, 5.75 h)	79.1° 20:55	11.4	100%	42.3°
2033-12-06 Tue	62	—	unknown	18:35–19:15 (good, 0.67 h)	79.1° 20:55	11.41	99%	55.0°
2033-12-07 Wed	74	—	unknown	18:35–21:50 (good, 3.25 h)	79.1° 20:50	11.42	96%	68.0°
2033-12-08 Thu	100	—	unknown	18:35–00:10 (good, 5.58 h)	79.1° 20:45	11.44	91%	80.9°
2033-12-09 Fri	100	—	unknown	18:35–01:35 (good, 7.0 h)	79.1° 20:40	11.45	84%	93.4°
2033-12-10 Sat	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.1° 20:40	11.46	76%	105.5°
2033-12-11 Sun	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.1° 20:35	11.47	66%	117.2°
2033-12-12 Mon	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.1° 20:30	11.47	57%	128.3°
2033-12-13 Tue	100	—	unknown	18:35–01:55 (good, 7.33 h)	79.1° 20:25	11.48	47%	138.7°
2033-12-14 Wed	100	—	unknown	18:35–01:50 (good, 7.25 h)	79.1° 20:20	11.49	38%	148.1°
2033-12-15 Thu	100	—	unknown	18:35–01:50 (good, 7.25 h)	79.1° 20:20	11.49	29%	155.4°
2033-12-16 Fri	100	—	unknown	18:35–01:45 (good, 7.17 h)	79.1° 20:15	11.5	21%	158.6°
2033-12-17 Sat	100	—	unknown	18:35–01:40 (good, 7.08 h)	79.1° 20:10	11.5	14%	156.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-11-18&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.