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: 10-19 (100), 10-20 (100), 10-21 (100), 10-22 (100), 10-31 (100) — by astronomy; check the weather when the night is within four days.

2034-10-19astronomy score per night — click a bar for that night2034-11-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-10-19 Thu	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.1° 01:05	9.99	44%	100.9°
2034-10-20 Fri	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 01:00	10.04	54%	89.5°
2034-10-21 Sat	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 00:55	10.08	64%	77.8°
2034-10-22 Sun	100	—	unknown	21:00–06:10 (good, 9.17 h)	79.1° 00:50	10.12	74%	65.8°
2034-10-23 Mon	95	—	unknown	00:20–06:15 (good, 5.92 h)	79.1° 00:45	10.16	83%	53.7°
2034-10-24 Tue	86	—	unknown	04:55–06:15 (good, 1.33 h)	79.1° 00:45	10.2	90%	41.7°
2034-10-25 Wed	63	—	unknown	06:05–06:10 (good, 0.08 h)	79.1° 00:40	10.24	96%	30.8°
2034-10-26 Thu	34	—	unknown	02:10–06:10 (marginal, 4.0 h)	79.1° 00:35	10.28	99%	23.5°
2034-10-27 Fri	36	—	unknown	20:00–23:30 (marginal, 3.5 h)	79.1° 00:30	10.32	100%	24.1°
2034-10-28 Sat	46	—	unknown	19:55–01:10 (marginal, 5.25 h)	79.1° 00:30	10.35	97%	32.2°
2034-10-29 Sun	86	—	unknown	18:55–19:20 (good, 0.42 h)	79.1° 23:25	10.39	91%	43.9°
2034-10-30 Mon	94	—	unknown	18:55–23:35 (good, 4.67 h)	79.1° 23:20	10.43	84%	56.8°
2034-10-31 Tue	100	—	unknown	18:55–02:40 (good, 7.75 h)	79.1° 23:15	10.47	74%	69.9°
2034-11-01 Wed	100	—	unknown	18:50–04:15 (good, 9.42 h)	79.1° 23:10	10.5	63%	82.8°
2034-11-02 Thu	100	—	unknown	18:50–04:25 (good, 9.58 h)	79.1° 23:10	10.54	52%	95.5°
2034-11-03 Fri	100	—	unknown	18:50–04:30 (good, 9.67 h)	79.1° 23:05	10.58	42%	107.7°
2034-11-04 Sat	100	—	unknown	18:50–04:30 (good, 9.67 h)	79.1° 23:00	10.61	32%	119.5°
2034-11-05 Sun	100	—	unknown	18:50–04:25 (good, 9.58 h)	79.1° 22:55	10.64	23%	130.6°
2034-11-06 Mon	100	—	unknown	18:45–04:25 (good, 9.67 h)	79.1° 22:50	10.68	15%	141.0°
2034-11-07 Tue	100	—	unknown	18:45–04:20 (good, 9.58 h)	79.1° 22:50	10.71	9%	149.9°
2034-11-08 Wed	100	—	unknown	18:45–04:15 (good, 9.5 h)	79.1° 22:45	10.75	4%	156.0°
2034-11-09 Thu	100	—	unknown	18:45–04:15 (good, 9.5 h)	79.1° 22:40	10.78	1%	157.1°
2034-11-10 Fri	100	—	unknown	18:45–04:10 (good, 9.42 h)	79.1° 22:35	10.81	0%	152.8°
2034-11-11 Sat	100	—	unknown	18:45–04:05 (good, 9.33 h)	79.1° 22:35	10.84	1%	145.1°
2034-11-12 Sun	100	—	unknown	18:40–04:00 (good, 9.33 h)	79.1° 22:30	10.87	3%	135.7°
2034-11-13 Mon	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.1° 22:25	10.9	7%	125.5°
2034-11-14 Tue	100	—	unknown	18:40–03:55 (good, 9.25 h)	79.1° 22:20	10.93	13%	114.9°
2034-11-15 Wed	100	—	unknown	18:40–03:50 (good, 9.17 h)	79.1° 22:15	10.96	20%	104.0°
2034-11-16 Thu	100	—	unknown	18:40–03:45 (good, 9.08 h)	79.1° 22:15	10.99	28%	92.9°
2034-11-17 Fri	100	—	unknown	18:40–03:40 (good, 9.0 h)	79.1° 22:10	11.02	38%	81.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-10-19&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.