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: 11-10 (100), 11-11 (100), 11-12 (100), 11-13 (100), 11-14 (100) — by astronomy; check the weather when the night is within four days.

2047-10-31astronomy score per night — click a bar for that night2047-11-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-10-31 Thu	54	—	unknown	20:50–05:20 (marginal, 8.5 h)	72.6° 01:30	10.46	97%	40.8°
2047-11-01 Fri	32	—	unknown	01:55–05:20 (marginal, 3.42 h)	72.6° 01:25	10.5	99%	28.9°
2047-11-02 Sat	26	—	unknown	03:00–05:25 (marginal, 2.42 h)	72.6° 01:20	10.53	100%	17.0°
2047-11-03 Sun	22	—	unknown	04:10–05:25 (marginal, 1.25 h)	72.6° 01:20	10.57	99%	5.2°
2047-11-04 Mon	27	—	unknown	20:10–23:25 (marginal, 3.25 h)	72.6° 01:15	10.61	96%	6.8°
2047-11-05 Tue	36	—	unknown	19:55–01:25 (marginal, 5.5 h)	72.6° 01:10	10.64	91%	18.6°
2047-11-06 Wed	50	—	unknown	19:35–05:30 (marginal, 9.92 h)	72.6° 01:05	10.67	85%	30.5°
2047-11-07 Thu	82	—	unknown	21:00–23:20 (good, 2.33 h)	72.6° 01:00	10.71	77%	42.6°
2047-11-08 Fri	90	—	unknown	19:50–03:05 (good, 7.25 h)	72.6° 01:00	10.74	69%	54.8°
2047-11-09 Sat	98	—	unknown	19:50–04:55 (good, 9.08 h)	72.6° 00:55	10.77	59%	67.3°
2047-11-10 Sun	100	—	unknown	19:45–05:30 (good, 9.75 h)	72.6° 00:50	10.81	49%	80.2°
2047-11-11 Mon	100	—	unknown	19:40–05:35 (good, 9.92 h)	72.6° 00:45	10.84	38%	93.4°
2047-11-12 Tue	100	—	unknown	19:35–05:35 (good, 10.0 h)	72.6° 00:40	10.87	28%	107.0°
2047-11-13 Wed	100	—	unknown	19:30–05:35 (good, 10.08 h)	72.6° 00:40	10.9	18%	121.2°
2047-11-14 Thu	100	—	unknown	19:30–05:35 (good, 10.08 h)	72.6° 00:35	10.93	10%	135.7°
2047-11-15 Fri	100	—	unknown	19:25–05:35 (good, 10.17 h)	72.6° 00:30	10.96	4%	150.7°
2047-11-16 Sat	100	—	unknown	19:20–05:40 (good, 10.33 h)	72.6° 00:25	10.98	1%	165.8°
2047-11-17 Sun	100	—	unknown	19:15–05:35 (good, 10.33 h)	72.6° 00:25	11.01	0%	178.5°
2047-11-18 Mon	100	—	unknown	19:15–05:30 (good, 10.25 h)	72.6° 00:20	11.04	3%	163.6°
2047-11-19 Tue	100	—	unknown	19:10–05:25 (good, 10.25 h)	72.6° 00:15	11.07	8%	148.6°
2047-11-20 Wed	100	—	unknown	19:05–05:20 (good, 10.25 h)	72.6° 00:10	11.09	16%	134.1°
2047-11-21 Thu	100	—	unknown	19:05–05:20 (good, 10.25 h)	72.6° 00:05	11.12	25%	119.9°
2047-11-22 Fri	100	—	unknown	19:05–05:15 (good, 10.17 h)	72.6° 00:05	11.14	35%	106.3°
2047-11-23 Sat	100	—	unknown	19:05–05:10 (good, 10.08 h)	72.6° 00:00	11.17	46%	93.1°
2047-11-24 Sun	100	—	unknown	19:10–05:05 (good, 9.92 h)	72.6° 23:55	11.19	56%	80.4°
2047-11-25 Mon	100	—	unknown	20:00–05:00 (good, 9.0 h)	72.6° 23:50	11.21	65%	67.9°
2047-11-26 Tue	95	—	unknown	21:45–05:00 (good, 7.25 h)	72.6° 23:45	11.23	74%	55.7°
2047-11-27 Wed	87	—	unknown	01:25–04:55 (good, 3.5 h)	72.6° 23:45	11.25	82%	43.7°
2047-11-28 Thu	73	—	unknown	04:30–04:50 (good, 0.33 h)	72.6° 23:40	11.27	89%	31.8°
2047-11-29 Fri	39	—	unknown	23:45–05:00 (marginal, 5.25 h)	72.6° 23:35	11.29	94%	20.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-10-31&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.