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: 10-18 (100), 10-19 (100), 10-20 (100), 10-21 (100), 10-22 (100) — by astronomy; check the weather when the night is within four days.

2030-10-10astronomy score per night — click a bar for that night2030-11-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-10-10 Thu	35	—	unknown	02:25–06:00 (marginal, 3.58 h)	79.1° 01:40	9.6	100%	26.0°
2030-10-11 Fri	28	—	unknown	20:20–23:10 (marginal, 2.83 h)	79.1° 01:35	9.65	100%	18.1°
2030-10-12 Sat	33	—	unknown	20:20–00:00 (marginal, 3.67 h)	79.1° 01:30	9.69	98%	16.9°
2030-10-13 Sun	40	—	unknown	20:20–01:20 (marginal, 5.0 h)	79.1° 01:25	9.74	94%	23.2°
2030-10-14 Mon	76	—	unknown	20:15–20:20 (good, 0.08 h)	79.1° 01:25	9.78	89%	32.6°
2030-10-15 Tue	85	—	unknown	20:15–23:15 (good, 3.0 h)	79.1° 01:20	9.82	82%	43.2°
2030-10-16 Wed	91	—	unknown	20:15–02:10 (good, 5.92 h)	79.1° 01:15	9.87	75%	54.1°
2030-10-17 Thu	99	—	unknown	20:10–04:45 (good, 8.58 h)	79.1° 01:10	9.91	66%	65.3°
2030-10-18 Fri	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.1° 01:05	9.95	57%	76.7°
2030-10-19 Sat	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.1° 01:05	9.99	47%	88.2°
2030-10-20 Sun	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 01:00	10.03	37%	100.1°
2030-10-21 Mon	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 00:55	10.08	28%	112.2°
2030-10-22 Tue	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 00:50	10.12	19%	124.5°
2030-10-23 Wed	100	—	unknown	20:05–06:15 (good, 10.17 h)	79.1° 00:45	10.16	11%	137.0°
2030-10-24 Thu	100	—	unknown	20:00–06:15 (good, 10.25 h)	79.1° 00:45	10.2	5%	149.2°
2030-10-25 Fri	100	—	unknown	20:00–06:10 (good, 10.17 h)	79.1° 00:40	10.24	1%	159.8°
2030-10-26 Sat	100	—	unknown	20:00–05:10 (good, 10.17 h)	79.1° 00:35	10.28	0%	163.5°
2030-10-27 Sun	100	—	unknown	19:00–05:05 (good, 10.08 h)	79.1° 23:30	10.32	2%	156.3°
2030-10-28 Mon	100	—	unknown	18:55–05:00 (good, 10.08 h)	79.1° 23:30	10.35	6%	144.1°
2030-10-29 Tue	100	—	unknown	18:55–04:55 (good, 10.0 h)	79.1° 23:25	10.39	13%	130.6°
2030-10-30 Wed	100	—	unknown	18:55–04:50 (good, 9.92 h)	79.1° 23:20	10.43	22%	116.8°
2030-10-31 Thu	100	—	unknown	18:55–04:50 (good, 9.92 h)	79.1° 23:15	10.47	32%	103.1°
2030-11-01 Fri	100	—	unknown	18:50–04:45 (good, 9.92 h)	79.1° 23:10	10.5	44%	89.6°
2030-11-02 Sat	100	—	unknown	18:50–04:40 (good, 9.83 h)	79.1° 23:10	10.54	55%	76.5°
2030-11-03 Sun	100	—	unknown	18:50–04:35 (good, 9.75 h)	79.1° 23:05	10.57	65%	63.7°
2030-11-04 Mon	94	—	unknown	21:45–04:30 (good, 6.75 h)	79.1° 23:00	10.61	75%	51.3°
2030-11-05 Tue	86	—	unknown	03:10–04:30 (good, 1.33 h)	79.1° 22:55	10.64	83%	39.5°
2030-11-06 Wed	65	—	unknown	04:15–04:25 (good, 0.17 h)	79.1° 22:50	10.68	90%	28.6°
2030-11-07 Thu	37	—	unknown	23:20–04:30 (marginal, 5.17 h)	79.1° 22:50	10.71	95%	19.8°
2030-11-08 Fri	28	—	unknown	01:45–04:10 (marginal, 2.42 h)	79.1° 22:45	10.74	98%	16.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-10-10&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.