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.

2032-08-25astronomy score per night — click a bar for that night2032-09-23

night of	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-08-31 Tue	—	unknown	—	50.2° 15:10	7.59	14%	70.5°
2032-09-01 Wed	—	unknown	—	50.2° 15:05	7.64	8%	58.7°
2032-09-02 Thu	—	unknown	—	50.2° 15:05	7.7	4%	47.0°
2032-09-03 Fri	—	unknown	—	50.2° 15:00	7.75	1%	35.3°
2032-09-04 Sat	—	unknown	—	50.2° 14:55	7.81	0%	23.9°
2032-09-05 Sun	—	unknown	—	50.2° 14:50	7.86	1%	13.0°
2032-09-06 Mon	—	unknown	—	50.2° 14:45	7.92	4%	7.0°
2032-09-07 Tue	—	unknown	—	50.2° 14:45	7.97	8%	14.7°
2032-09-08 Wed	—	unknown	—	50.2° 14:40	8.03	14%	26.0°
2032-09-09 Thu	—	unknown	—	50.2° 14:35	8.08	22%	38.1°
2032-09-10 Fri	—	unknown	—	50.2° 14:30	8.14	31%	50.5°
2032-09-11 Sat	—	unknown	—	50.2° 14:30	8.19	41%	63.2°
2032-09-12 Sun	—	unknown	—	50.2° 14:25	8.24	52%	76.4°
2032-09-13 Mon	—	unknown	—	50.2° 14:20	8.3	62%	89.9°
2032-09-14 Tue	—	unknown	—	50.2° 14:15	8.35	73%	103.8°
2032-09-15 Wed	—	unknown	—	50.2° 14:10	8.4	83%	118.1°
2032-09-16 Thu	—	unknown	—	50.2° 14:10	8.45	91%	132.8°
2032-09-17 Fri	—	unknown	—	50.2° 14:05	8.51	97%	147.5°
2032-09-18 Sat	—	unknown	—	50.2° 14:00	8.56	100%	162.0°
2032-09-19 Sun	—	unknown	—	50.2° 13:55	8.61	100%	172.9°
2032-09-20 Mon	—	unknown	—	50.2° 13:50	8.66	97%	164.9°
2032-09-21 Tue	—	unknown	—	50.2° 13:50	8.71	91%	151.2°
2032-09-22 Wed	—	unknown	—	50.2° 13:45	8.76	83%	137.4°
2032-09-23 Thu	—	unknown	—	50.2° 13:40	8.81	74%	123.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-25&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.