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: 10-13 (100), 10-14 (100), 10-15 (100), 10-16 (100), 10-17 (100) — by astronomy; check the weather when the night is within four days.

2033-10-11astronomy score per night — click a bar for that night2033-11-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-10-11 Tue	85	—	unknown	20:20–21:20 (good, 1.0 h)	79.1° 01:35	9.66	83%	41.0°
2033-10-12 Wed	92	—	unknown	20:20–02:30 (good, 6.17 h)	79.1° 01:30	9.7	74%	53.3°
2033-10-13 Thu	100	—	unknown	20:15–05:15 (good, 9.0 h)	79.1° 01:25	9.75	63%	65.8°
2033-10-14 Fri	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:20	9.79	53%	78.0°
2033-10-15 Sat	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:20	9.83	43%	90.0°
2033-10-16 Sun	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:15	9.88	33%	101.6°
2033-10-17 Mon	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.1° 01:10	9.92	24%	112.9°
2033-10-18 Tue	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.1° 01:05	9.96	16%	123.9°
2033-10-19 Wed	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.1° 01:00	10.0	10%	134.5°
2033-10-20 Thu	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 01:00	10.05	5%	144.3°
2033-10-21 Fri	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 00:55	10.09	2%	152.7°
2033-10-22 Sat	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 00:50	10.13	0%	158.1°
2033-10-23 Sun	100	—	unknown	20:05–06:15 (good, 10.17 h)	79.1° 00:45	10.17	0%	158.0°
2033-10-24 Mon	100	—	unknown	20:00–06:15 (good, 10.25 h)	79.1° 00:40	10.21	2%	152.5°
2033-10-25 Tue	100	—	unknown	20:00–06:10 (good, 10.17 h)	79.1° 00:40	10.25	6%	143.8°
2033-10-26 Wed	100	—	unknown	20:00–06:05 (good, 10.08 h)	79.1° 00:35	10.29	12%	133.7°
2033-10-27 Thu	100	—	unknown	20:00–06:05 (good, 10.08 h)	79.1° 00:30	10.33	19%	122.8°
2033-10-28 Fri	100	—	unknown	19:55–06:00 (good, 10.08 h)	79.1° 00:25	10.36	27%	111.4°
2033-10-29 Sat	100	—	unknown	19:55–04:55 (good, 10.0 h)	79.1° 00:25	10.4	37%	99.5°
2033-10-30 Sun	100	—	unknown	18:55–04:50 (good, 9.92 h)	79.1° 23:20	10.44	47%	87.3°
2033-10-31 Mon	100	—	unknown	18:55–04:45 (good, 9.83 h)	79.1° 23:15	10.48	58%	74.8°
2033-11-01 Tue	100	—	unknown	19:20–04:45 (good, 9.42 h)	79.1° 23:10	10.51	69%	62.1°
2033-11-02 Wed	93	—	unknown	23:10–04:40 (good, 5.5 h)	79.1° 23:05	10.55	79%	49.3°
2033-11-03 Thu	83	—	unknown	03:40–04:35 (good, 0.92 h)	79.1° 23:05	10.58	88%	36.9°
2033-11-04 Fri	44	—	unknown	18:50–04:50 (marginal, 10.0 h)	79.1° 23:00	10.62	94%	26.3°
2033-11-05 Sat	32	—	unknown	01:00–04:25 (marginal, 3.42 h)	79.1° 22:55	10.65	99%	21.2°
2033-11-06 Sun	33	—	unknown	18:45–21:55 (marginal, 3.17 h)	79.1° 22:50	10.69	100%	25.4°
2033-11-07 Mon	46	—	unknown	18:45–00:10 (marginal, 5.42 h)	79.1° 22:45	10.72	98%	35.7°
2033-11-08 Tue	88	—	unknown	18:45–20:25 (good, 1.67 h)	79.1° 22:45	10.75	94%	48.0°
2033-11-09 Wed	96	—	unknown	18:45–23:15 (good, 4.5 h)	79.1° 22:40	10.79	87%	60.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-10-11&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.