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), 08-31 (94), 08-30 (84) — by astronomy; check the weather when the night is within four days.

2032-08-05astronomy score per night — click a bar for that night2032-09-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-08-05 Thu	41	—	unknown	03:00–04:35 (good, 1.58 h)	72.5° 08:10	6.1	0%	71.7°
2032-08-06 Fri	43	—	unknown	03:00–04:35 (good, 1.58 h)	72.5° 08:05	6.16	1%	83.5°
2032-08-07 Sat	44	—	unknown	02:55–04:35 (good, 1.67 h)	72.5° 08:00	6.22	3%	95.2°
2032-08-08 Sun	46	—	unknown	02:50–04:35 (good, 1.75 h)	72.5° 07:55	6.27	7%	107.0°
2032-08-09 Mon	49	—	unknown	02:45–04:40 (good, 1.92 h)	72.5° 07:50	6.33	12%	118.7°
2032-08-10 Tue	51	—	unknown	02:45–04:40 (good, 1.92 h)	72.5° 07:50	6.39	19%	130.6°
2032-08-11 Wed	53	—	unknown	02:40–04:40 (good, 2.0 h)	72.5° 07:45	6.44	27%	142.5°
2032-08-12 Thu	57	—	unknown	02:35–04:45 (good, 2.17 h)	72.5° 07:40	6.5	36%	154.5°
2032-08-13 Fri	58	—	unknown	02:30–04:45 (good, 2.25 h)	72.5° 07:35	6.56	46%	166.3°
2032-08-14 Sat	60	—	unknown	02:25–04:45 (good, 2.33 h)	72.5° 07:35	6.62	56%	173.6°
2032-08-15 Sun	63	—	unknown	02:25–04:50 (good, 2.42 h)	72.5° 07:30	6.67	67%	164.6°
2032-08-16 Mon	66	—	unknown	02:20–04:50 (good, 2.5 h)	72.5° 07:25	6.73	77%	151.5°
2032-08-17 Tue	65	—	unknown	02:20–04:50 (good, 2.5 h)	72.5° 07:20	6.79	86%	137.6°
2032-08-18 Wed	66	—	unknown	02:20–04:55 (good, 2.58 h)	72.5° 07:15	6.85	93%	123.0°
2032-08-19 Thu	54	—	unknown	02:25–04:55 (good, 2.5 h)	72.5° 07:15	6.9	98%	108.1°
2032-08-20 Fri	43	—	unknown	02:55–04:55 (good, 2.0 h)	72.5° 07:10	6.96	100%	93.0°
2032-08-21 Sat	32	—	unknown	04:20–04:55 (good, 0.58 h)	72.5° 07:05	7.02	99%	77.8°
2032-08-22 Sun	24	—	unknown	01:50–05:00 (marginal, 3.17 h)	72.5° 07:00	7.08	95%	62.8°
2032-08-23 Mon	19	—	unknown	01:50–05:00 (marginal, 3.17 h)	72.5° 06:55	7.13	88%	48.1°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-05&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.