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: 08-06 (42), 08-07 (42), 08-05 (39), 08-08 (39), 08-04 (38) — by astronomy; check the weather when the night is within four days.

2033-07-19astronomy score per night — click a bar for that night2033-08-17

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-07-19 Tue	4	—	unknown	03:45–04:05 (marginal, 0.33 h)	72.6° 09:15	5.19	41%	23.1°
2033-07-20 Wed	6	—	unknown	03:40–04:05 (marginal, 0.42 h)	72.6° 09:10	5.24	31%	11.0°
2033-07-21 Thu	9	—	unknown	03:35–04:55 (marginal, 1.33 h)	72.6° 09:10	5.29	21%	9.6°
2033-07-22 Fri	11	—	unknown	04:05–04:10 (good, 0.08 h)	72.6° 09:05	5.34	13%	20.8°
2033-07-23 Sat	14	—	unknown	03:55–04:10 (good, 0.25 h)	72.6° 09:00	5.39	6%	33.6°
2033-07-24 Sun	17	—	unknown	03:50–04:15 (good, 0.42 h)	72.6° 08:55	5.44	2%	46.5°
2033-07-25 Mon	19	—	unknown	03:45–04:15 (good, 0.5 h)	72.6° 08:55	5.49	0%	59.3°
2033-07-26 Tue	20	—	unknown	03:45–04:15 (good, 0.5 h)	72.6° 08:50	5.54	0%	71.9°
2033-07-27 Wed	23	—	unknown	03:40–04:20 (good, 0.67 h)	72.6° 08:45	5.59	3%	84.2°
2033-07-28 Thu	25	—	unknown	03:35–04:20 (good, 0.75 h)	72.6° 08:40	5.65	7%	96.4°
2033-07-29 Fri	26	—	unknown	03:30–04:20 (good, 0.83 h)	72.6° 08:35	5.7	12%	108.4°
2033-07-30 Sat	28	—	unknown	03:25–04:25 (good, 1.0 h)	72.6° 08:35	5.76	19%	120.2°
2033-07-31 Sun	30	—	unknown	03:25–04:25 (good, 1.0 h)	72.6° 08:30	5.81	27%	131.9°
2033-08-01 Mon	32	—	unknown	03:20–04:25 (good, 1.08 h)	72.6° 08:25	5.86	36%	143.5°
2033-08-02 Tue	34	—	unknown	03:15–04:30 (good, 1.25 h)	72.6° 08:20	5.92	45%	154.9°
2033-08-03 Wed	35	—	unknown	03:10–04:30 (good, 1.33 h)	72.6° 08:15	5.98	55%	165.8°
2033-08-04 Thu	38	—	unknown	03:05–04:30 (good, 1.42 h)	72.6° 08:15	6.03	64%	172.2°
2033-08-05 Fri	39	—	unknown	03:05–04:30 (good, 1.42 h)	72.6° 08:10	6.09	74%	164.9°
2033-08-06 Sat	42	—	unknown	03:00–04:35 (good, 1.58 h)	72.6° 08:05	6.14	82%	153.1°
2033-08-07 Sun	42	—	unknown	03:05–04:35 (good, 1.5 h)	72.6° 08:00	6.2	90%	140.2°
2033-08-08 Mon	39	—	unknown	03:00–04:35 (good, 1.58 h)	72.6° 08:00	6.26	95%	126.7°
2033-08-09 Tue	37	—	unknown	03:00–04:40 (good, 1.67 h)	72.6° 07:55	6.32	99%	112.8°
2033-08-10 Wed	31	—	unknown	03:10–04:40 (good, 1.5 h)	72.6° 07:50	6.37	100%	98.5°
2033-08-11 Thu	24	—	unknown	04:15–04:40 (good, 0.42 h)	72.6° 07:45	6.43	98%	83.9°
2033-08-12 Fri	19	—	unknown	02:25–04:45 (marginal, 2.33 h)	72.6° 07:40	6.49	93%	69.3°
2033-08-13 Sat	16	—	unknown	02:25–04:45 (marginal, 2.33 h)	72.6° 07:40	6.54	86%	54.7°
2033-08-14 Sun	15	—	unknown	02:20–04:45 (marginal, 2.42 h)	72.6° 07:35	6.6	77%	40.3°
2033-08-15 Mon	18	—	unknown	02:10–04:50 (marginal, 2.67 h)	72.6° 07:30	6.66	66%	26.4°
2033-08-16 Tue	25	—	unknown	01:55–04:50 (marginal, 2.92 h)	72.6° 07:25	6.72	55%	13.6°
2033-08-17 Wed	34	—	unknown	02:40–04:50 (good, 2.17 h)	72.6° 07:20	6.78	44%	8.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-07-19&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.