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: 10-10 (100), 10-11 (100), 10-12 (100), 10-13 (100), 10-14 (100) — by astronomy; check the weather when the night is within four days.

2026-10-10astronomy score per night — click a bar for that night2026-11-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2026-10-10 Sat	100	98	98	20:25–06:00 (good, 9.58 h)	79.1° 01:40	9.6	0%	160.4°
2026-10-11 Sun	100	0	0	—	79.1° 01:35	9.64	2%	165.2°
2026-10-12 Mon	100	0	0	—	79.1° 01:30	9.69	6%	160.9°
2026-10-13 Tue	100	0	0	03:00–06:00 (good, 3.0 h)	79.1° 01:25	9.73	11%	151.5°
2026-10-14 Wed	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:25	9.78	17%	140.8°
2026-10-15 Thu	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:20	9.82	25%	129.7°
2026-10-16 Fri	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:15	9.86	34%	118.4°
2026-10-17 Sat	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.1° 01:10	9.91	43%	107.1°
2026-10-18 Sun	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.1° 01:05	9.95	52%	95.6°
2026-10-19 Mon	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.1° 01:05	9.99	62%	83.9°
2026-10-20 Tue	100	—	unknown	20:20–06:10 (good, 9.83 h)	79.1° 01:00	10.03	71%	72.1°
2026-10-21 Wed	100	—	unknown	22:05–06:10 (good, 8.08 h)	79.1° 00:55	10.08	80%	60.0°
2026-10-22 Thu	91	—	unknown	02:20–06:10 (good, 3.83 h)	79.1° 00:50	10.12	87%	47.7°
2026-10-23 Fri	82	—	unknown	05:30–06:15 (good, 0.75 h)	79.1° 00:45	10.16	94%	35.4°
2026-10-24 Sat	39	—	unknown	01:25–05:15 (marginal, 4.83 h)	79.1° 00:45	10.2	98%	23.7°
2026-10-25 Sun	29	—	unknown	02:35–05:05 (marginal, 2.5 h)	79.1° 23:40	10.24	100%	15.5°
2026-10-26 Mon	31	—	unknown	19:00–22:00 (marginal, 3.0 h)	79.1° 23:35	10.28	99%	17.6°
2026-10-27 Tue	39	—	unknown	19:00–23:15 (marginal, 4.25 h)	79.1° 23:30	10.31	96%	28.2°
2026-10-28 Wed	56	—	unknown	18:55–04:35 (marginal, 9.67 h)	79.1° 23:25	10.35	90%	41.2°
2026-10-29 Thu	89	—	unknown	18:55–23:20 (good, 4.42 h)	79.1° 23:25	10.39	81%	55.0°
2026-10-30 Fri	98	—	unknown	18:55–02:45 (good, 7.83 h)	79.1° 23:20	10.43	71%	68.8°
2026-10-31 Sat	100	—	unknown	18:55–04:20 (good, 9.42 h)	79.1° 23:15	10.47	60%	82.6°
2026-11-01 Sun	100	—	unknown	18:50–04:30 (good, 9.67 h)	79.1° 23:10	10.5	49%	96.2°
2026-11-02 Mon	100	—	unknown	18:50–04:35 (good, 9.75 h)	79.1° 23:10	10.54	38%	109.6°
2026-11-03 Tue	100	—	unknown	18:50–04:35 (good, 9.75 h)	79.1° 23:05	10.57	28%	122.6°
2026-11-04 Wed	100	—	unknown	18:50–04:30 (good, 9.67 h)	79.1° 23:00	10.61	19%	135.2°
2026-11-05 Thu	100	—	unknown	18:50–04:25 (good, 9.58 h)	79.1° 22:55	10.64	12%	147.1°
2026-11-06 Fri	100	—	unknown	18:45–04:25 (good, 9.67 h)	79.1° 22:50	10.68	6%	157.8°
2026-11-07 Sat	100	—	unknown	18:45–04:20 (good, 9.58 h)	79.1° 22:50	10.71	2%	164.7°
2026-11-08 Sun	100	—	unknown	18:45–04:15 (good, 9.5 h)	79.1° 22:45	10.74	0%	163.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2026-10-10&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.