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.

2032-07-20astronomy score per night — click a bar for that night2032-08-18

night of	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-07-20 Tue	—	unknown	—	42.9° 11:00	5.25	95%	153.8°
2032-07-21 Wed	—	unknown	—	42.9° 10:55	5.3	99%	146.5°
2032-07-22 Thu	—	unknown	—	42.9° 10:50	5.35	100%	135.5°
2032-07-23 Fri	—	unknown	—	42.9° 10:50	5.4	98%	122.9°
2032-07-24 Sat	—	unknown	—	42.9° 10:45	5.45	93%	109.6°
2032-07-25 Sun	—	unknown	—	42.9° 10:40	5.5	86%	96.1°
2032-07-26 Mon	—	unknown	—	42.9° 10:35	5.55	76%	82.9°
2032-07-27 Tue	—	unknown	—	42.9° 10:30	5.61	66%	70.0°
2032-07-28 Wed	—	unknown	—	42.9° 10:30	5.66	55%	57.8°
2032-07-29 Thu	—	unknown	—	42.9° 10:25	5.71	44%	46.5°
2032-07-30 Fri	—	unknown	—	42.9° 10:20	5.77	34%	36.4°
2032-07-31 Sat	—	unknown	—	42.9° 10:15	5.82	25%	28.7°
2032-08-01 Sun	—	unknown	—	42.9° 10:10	5.88	16%	25.0°
2032-08-02 Mon	—	unknown	—	42.9° 10:10	5.93	10%	26.8°
2032-08-03 Tue	—	unknown	—	42.9° 10:05	5.99	5%	33.0°
2032-08-04 Wed	—	unknown	—	42.9° 10:00	6.05	2%	41.5°
2032-08-05 Thu	—	unknown	—	42.9° 09:55	6.1	0%	51.2°
2032-08-06 Fri	—	unknown	—	42.9° 09:55	6.16	1%	61.4°
2032-08-07 Sat	—	unknown	—	42.9° 09:50	6.22	3%	71.9°
2032-08-08 Sun	—	unknown	—	42.9° 09:45	6.27	7%	82.6°
2032-08-09 Mon	—	unknown	—	42.9° 09:40	6.33	12%	93.3°
2032-08-10 Tue	—	unknown	—	42.9° 09:35	6.39	19%	104.1°
2032-08-11 Wed	—	unknown	—	42.9° 09:35	6.44	27%	115.0°
2032-08-12 Thu	—	unknown	—	42.9° 09:30	6.5	36%	125.7°
2032-08-13 Fri	—	unknown	—	42.9° 09:25	6.56	46%	136.1°
2032-08-14 Sat	—	unknown	—	42.9° 09:20	6.62	56%	145.7°
2032-08-15 Sun	—	unknown	—	42.9° 09:15	6.67	67%	153.0°
2032-08-16 Mon	—	unknown	—	42.9° 09:15	6.73	77%	155.1°
2032-08-17 Tue	—	unknown	—	42.9° 09:10	6.79	86%	150.4°
2032-08-18 Wed	—	unknown	—	42.9° 09:05	6.85	93%	140.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-20&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.