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.

2032-08-01astronomy score per night — click a bar for that night2032-08-30

night of	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-08-01 Sun	—	unknown	—	50.2° 17:10	5.88	16%	103.7°
2032-08-02 Mon	—	unknown	—	50.2° 17:05	5.93	10%	91.5°
2032-08-03 Tue	—	unknown	—	50.2° 17:00	5.99	5%	79.4°
2032-08-04 Wed	—	unknown	—	50.2° 16:55	6.05	2%	67.5°
2032-08-05 Thu	—	unknown	—	50.2° 16:55	6.1	0%	55.7°
2032-08-06 Fri	—	unknown	—	50.2° 16:50	6.16	1%	44.0°
2032-08-07 Sat	—	unknown	—	50.2° 16:45	6.22	3%	32.4°
2032-08-08 Sun	—	unknown	—	50.2° 16:40	6.27	7%	21.1°
2032-08-09 Mon	—	unknown	—	50.2° 16:35	6.33	12%	10.7°
2032-08-10 Tue	—	unknown	—	50.2° 16:35	6.39	19%	8.1°
2032-08-11 Wed	—	unknown	—	50.2° 16:30	6.44	27%	17.4°
2032-08-12 Thu	—	unknown	—	50.2° 16:25	6.5	36%	29.0°
2032-08-13 Fri	—	unknown	—	50.2° 16:20	6.56	46%	41.3°
2032-08-14 Sat	—	unknown	—	50.2° 16:20	6.62	56%	54.0°
2032-08-15 Sun	—	unknown	—	50.2° 16:15	6.67	67%	67.2°
2032-08-16 Mon	—	unknown	—	50.2° 16:10	6.73	77%	80.9°
2032-08-17 Tue	—	unknown	—	50.2° 16:05	6.79	86%	95.0°
2032-08-18 Wed	—	unknown	—	50.2° 16:00	6.85	93%	109.6°
2032-08-19 Thu	—	unknown	—	50.2° 16:00	6.9	98%	124.4°
2032-08-20 Fri	—	unknown	—	50.2° 15:55	6.96	100%	139.5°
2032-08-21 Sat	—	unknown	—	50.2° 15:50	7.02	99%	154.3°
2032-08-22 Sun	—	unknown	—	50.2° 15:45	7.08	95%	168.1°
2032-08-23 Mon	—	unknown	—	50.2° 15:40	7.13	88%	171.2°
2032-08-24 Tue	—	unknown	—	50.2° 15:40	7.19	80%	159.1°
2032-08-25 Wed	—	unknown	—	50.2° 15:35	7.25	70%	145.7°
2032-08-26 Thu	—	unknown	—	50.2° 15:30	7.3	59%	132.4°
2032-08-27 Fri	—	unknown	—	50.2° 15:25	7.36	49%	119.4°
2032-08-28 Sat	—	unknown	—	50.2° 15:25	7.42	39%	106.8°
2032-08-29 Sun	—	unknown	—	50.2° 15:20	7.47	29%	94.5°
2032-08-30 Mon	—	unknown	—	50.2° 15:15	7.53	21%	82.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-01&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.