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: 11-15 (100), 11-16 (100), 11-17 (100), 11-18 (100), 11-19 (100) — by astronomy; check the weather when the night is within four days.

2047-11-15astronomy score per night — click a bar for that night2047-12-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2047-11-30 Sat	28	—	unknown	01:30–04:40 (marginal, 3.17 h)	72.6° 23:30	11.31	98%	8.2°
2047-12-01 Sun	24	—	unknown	18:35–20:05 (marginal, 1.5 h)	72.6° 23:30	11.33	100%	3.8°
2047-12-02 Mon	27	—	unknown	18:35–21:30 (marginal, 2.92 h)	72.6° 23:25	11.35	100%	15.7°
2047-12-03 Tue	34	—	unknown	18:35–22:35 (marginal, 4.0 h)	72.6° 23:20	11.36	98%	27.6°
2047-12-04 Wed	52	—	unknown	18:10–02:25 (marginal, 8.25 h)	72.6° 23:15	11.38	95%	39.7°
2047-12-05 Thu	87	—	unknown	18:35–21:50 (good, 3.25 h)	72.6° 23:10	11.39	90%	52.0°
2047-12-06 Fri	95	—	unknown	18:35–01:10 (good, 6.58 h)	72.6° 23:10	11.41	83%	64.3°
2047-12-07 Sat	100	—	unknown	18:35–02:50 (good, 8.25 h)	72.6° 23:05	11.42	74%	76.9°
2047-12-08 Sun	100	—	unknown	18:35–03:50 (good, 9.25 h)	72.6° 23:00	11.43	65%	89.8°
2047-12-09 Mon	100	—	unknown	18:35–03:55 (good, 9.33 h)	72.6° 22:55	11.44	55%	102.9°
2047-12-10 Tue	100	—	unknown	18:35–04:00 (good, 9.42 h)	72.6° 22:50	11.45	44%	116.5°
2047-12-11 Wed	100	—	unknown	18:35–03:55 (good, 9.33 h)	72.6° 22:50	11.46	33%	130.3°
2047-12-12 Thu	100	—	unknown	18:35–03:55 (good, 9.33 h)	72.6° 22:45	11.47	22%	144.6°
2047-12-13 Fri	100	—	unknown	18:35–03:50 (good, 9.25 h)	72.6° 22:40	11.48	14%	159.3°
2047-12-14 Sat	100	—	unknown	18:35–03:50 (good, 9.25 h)	72.6° 22:35	11.48	6%	174.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-11-15&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.