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: 08-02 (100), 08-03 (100), 08-04 (100), 08-05 (100), 08-06 (100) — by astronomy; check the weather when the night is within four days.

2033-07-21astronomy score per night — click a bar for that night2033-08-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-07-21 Thu	62	—	unknown	01:30–04:10 (good, 2.67 h)	79.1° 06:55	5.29	21%	39.1°
2033-07-22 Fri	70	—	unknown	01:25–04:10 (good, 2.75 h)	79.1° 06:50	5.34	13%	50.8°
2033-07-23 Sat	77	—	unknown	01:20–04:10 (good, 2.83 h)	79.1° 06:50	5.39	6%	62.9°
2033-07-24 Sun	80	—	unknown	01:15–04:15 (good, 3.0 h)	79.1° 06:45	5.44	2%	75.1°
2033-07-25 Mon	82	—	unknown	01:15–04:15 (good, 3.0 h)	79.1° 06:40	5.49	0%	87.1°
2033-07-26 Tue	84	—	unknown	01:10–04:15 (good, 3.08 h)	79.1° 06:35	5.54	0%	99.0°
2033-07-27 Wed	89	—	unknown	01:05–04:20 (good, 3.25 h)	79.1° 06:30	5.59	3%	110.6°
2033-07-28 Thu	91	—	unknown	01:00–04:20 (good, 3.33 h)	79.1° 06:30	5.65	7%	121.9°
2033-07-29 Fri	92	—	unknown	00:55–04:20 (good, 3.42 h)	79.1° 06:25	5.7	12%	132.7°
2033-07-30 Sat	95	—	unknown	00:55–04:25 (good, 3.5 h)	79.1° 06:20	5.76	19%	142.8°
2033-07-31 Sun	97	—	unknown	00:50–04:25 (good, 3.58 h)	79.1° 06:15	5.81	27%	151.6°
2033-08-01 Mon	99	—	unknown	00:45–04:25 (good, 3.67 h)	79.1° 06:15	5.86	36%	157.7°
2033-08-02 Tue	100	—	unknown	00:40–04:30 (good, 3.83 h)	79.1° 06:10	5.92	45%	158.7°
2033-08-03 Wed	100	—	unknown	00:35–04:30 (good, 3.92 h)	79.1° 06:05	5.98	55%	153.8°
2033-08-04 Thu	100	—	unknown	00:40–04:30 (good, 3.83 h)	79.1° 06:00	6.03	64%	145.3°
2033-08-05 Fri	100	—	unknown	00:35–04:30 (good, 3.92 h)	79.1° 05:55	6.09	74%	134.9°
2033-08-06 Sat	100	—	unknown	00:35–04:35 (good, 4.0 h)	79.1° 05:55	6.14	82%	123.5°
2033-08-07 Sun	100	—	unknown	00:35–04:35 (good, 4.0 h)	79.1° 05:50	6.2	90%	111.3°
2033-08-08 Mon	79	—	unknown	00:40–04:35 (good, 3.92 h)	79.1° 05:45	6.26	95%	98.5°
2033-08-09 Tue	63	—	unknown	01:35–04:40 (good, 3.08 h)	79.1° 05:40	6.32	99%	85.3°
2033-08-10 Wed	48	—	unknown	03:05–04:40 (good, 1.58 h)	79.1° 05:35	6.37	100%	71.9°
2033-08-11 Thu	35	—	unknown	23:55–04:40 (marginal, 4.75 h)	79.1° 05:35	6.43	98%	58.4°
2033-08-12 Fri	27	—	unknown	23:55–04:45 (marginal, 4.83 h)	79.1° 05:30	6.49	93%	45.3°
2033-08-13 Sat	23	—	unknown	23:50–04:45 (marginal, 4.92 h)	79.1° 05:25	6.54	86%	33.2°
2033-08-14 Sun	30	—	unknown	23:35–04:45 (marginal, 5.17 h)	79.1° 05:20	6.6	77%	23.9°
2033-08-15 Mon	43	—	unknown	23:25–04:50 (marginal, 5.42 h)	79.1° 05:20	6.66	66%	21.2°
2033-08-16 Tue	61	—	unknown	00:10–04:50 (good, 4.67 h)	79.1° 05:15	6.72	55%	26.8°
2033-08-17 Wed	83	—	unknown	23:40–04:50 (good, 5.17 h)	79.1° 05:10	6.78	44%	36.7°
2033-08-18 Thu	90	—	unknown	23:40–04:50 (good, 5.17 h)	79.1° 05:05	6.83	34%	48.1°
2033-08-19 Fri	97	—	unknown	23:35–04:55 (good, 5.33 h)	79.1° 05:00	6.89	24%	60.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-07-21&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.