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 Seven Sisters: 09-01 (100), 09-02 (100), 09-03 (100), 09-04 (100), 09-05 (100) — by astronomy; check the weather when the night is within four days.

2032-08-24astronomy score per night — click a bar for that night2032-09-22

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-08-24 Tue	17	—	unknown	01:50–05:00 (marginal, 3.17 h)	72.5° 06:55	7.19	80%	33.8°
2032-08-25 Wed	22	—	unknown	01:30–05:05 (marginal, 3.58 h)	72.5° 06:50	7.25	70%	20.3°
2032-08-26 Thu	31	—	unknown	01:20–05:05 (marginal, 3.75 h)	72.5° 06:45	7.3	59%	8.6°
2032-08-27 Fri	42	—	unknown	02:20–05:05 (good, 2.75 h)	72.5° 06:40	7.36	49%	9.8°
2032-08-28 Sat	55	—	unknown	01:50–05:05 (good, 3.25 h)	72.5° 06:40	7.42	39%	21.1°
2032-08-29 Sun	70	—	unknown	01:30–05:10 (good, 3.67 h)	72.5° 06:35	7.47	29%	33.1°
2032-08-30 Mon	84	—	unknown	01:25–05:10 (good, 3.75 h)	72.5° 06:30	7.53	21%	45.1°
2032-08-31 Tue	94	—	unknown	01:20–05:10 (good, 3.83 h)	72.5° 06:25	7.59	14%	56.9°
2032-09-01 Wed	100	—	unknown	01:15–05:15 (good, 4.0 h)	72.5° 06:20	7.64	8%	68.8°
2032-09-02 Thu	100	—	unknown	01:10–05:15 (good, 4.08 h)	72.5° 06:20	7.7	4%	80.5°
2032-09-03 Fri	100	—	unknown	01:10–05:15 (good, 4.08 h)	72.5° 06:15	7.75	1%	92.3°
2032-09-04 Sat	100	—	unknown	01:05–05:15 (good, 4.17 h)	72.5° 06:10	7.81	0%	104.0°
2032-09-05 Sun	100	—	unknown	01:00–05:20 (good, 4.33 h)	72.5° 06:05	7.86	1%	115.8°
2032-09-06 Mon	100	—	unknown	00:55–05:20 (good, 4.42 h)	72.5° 06:00	7.92	4%	127.6°
2032-09-07 Tue	100	—	unknown	00:55–05:20 (good, 4.42 h)	72.5° 06:00	7.97	8%	139.5°
2032-09-08 Wed	100	—	unknown	00:50–05:20 (good, 4.5 h)	72.5° 05:55	8.03	14%	151.5°
2032-09-09 Thu	100	—	unknown	00:45–05:25 (good, 4.67 h)	72.5° 05:50	8.08	22%	163.2°
2032-09-10 Fri	100	—	unknown	00:40–05:25 (good, 4.75 h)	72.5° 05:45	8.14	31%	172.8°
2032-09-11 Sat	100	—	unknown	00:35–05:25 (good, 4.83 h)	72.5° 05:45	8.19	41%	168.0°
2032-09-12 Sun	100	—	unknown	00:35–05:25 (good, 4.83 h)	72.5° 05:40	8.24	52%	155.9°
2032-09-13 Mon	100	—	unknown	00:35–05:30 (good, 4.92 h)	72.5° 05:35	8.3	62%	142.6°
2032-09-14 Tue	100	—	unknown	00:30–05:30 (good, 5.0 h)	72.5° 05:30	8.35	73%	128.7°
2032-09-15 Wed	100	—	unknown	00:30–05:30 (good, 5.0 h)	72.5° 05:25	8.4	83%	114.4°
2032-09-16 Thu	100	—	unknown	00:40–05:30 (good, 4.83 h)	72.5° 05:25	8.45	91%	99.7°
2032-09-17 Fri	80	—	unknown	01:40–05:35 (good, 3.92 h)	72.5° 05:20	8.51	97%	84.8°
2032-09-18 Sat	57	—	unknown	03:35–05:35 (good, 2.0 h)	72.5° 05:15	8.56	100%	69.7°
2032-09-19 Sun	37	—	unknown	00:10–05:35 (marginal, 5.42 h)	72.5° 05:10	8.61	100%	54.7°
2032-09-20 Mon	23	—	unknown	00:25–05:35 (marginal, 5.17 h)	72.5° 05:05	8.66	97%	40.0°
2032-09-21 Tue	18	—	unknown	00:15–05:40 (marginal, 5.42 h)	72.5° 05:05	8.71	91%	25.7°
2032-09-22 Wed	24	—	unknown	23:50–05:40 (marginal, 5.83 h)	72.5° 05:00	8.76	83%	12.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-24&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.