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.

2044-11-15astronomy score per night — click a bar for that night2044-12-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-11-15 Tue	100	—	unknown	19:20–05:35 (good, 10.25 h)	72.5° 00:30	10.98	14%	130.8°
2044-11-16 Wed	100	—	unknown	19:20–05:35 (good, 10.25 h)	72.6° 00:25	11.01	8%	143.9°
2044-11-17 Thu	100	—	unknown	19:15–05:30 (good, 10.25 h)	72.6° 00:20	11.03	3%	156.7°
2044-11-18 Fri	100	—	unknown	19:10–05:25 (good, 10.25 h)	72.6° 00:15	11.06	1%	169.4°
2044-11-19 Sat	100	—	unknown	19:05–05:25 (good, 10.33 h)	72.6° 00:10	11.09	0%	178.0°
2044-11-20 Sun	100	—	unknown	19:00–05:20 (good, 10.33 h)	72.6° 00:10	11.11	2%	165.8°
2044-11-21 Mon	100	—	unknown	19:00–05:15 (good, 10.25 h)	72.6° 00:05	11.14	5%	153.8°
2044-11-22 Tue	100	—	unknown	18:55–05:10 (good, 10.25 h)	72.6° 00:00	11.16	10%	141.8°
2044-11-23 Wed	100	—	unknown	18:50–05:05 (good, 10.25 h)	72.6° 23:55	11.18	16%	130.0°
2044-11-24 Thu	100	—	unknown	18:50–05:05 (good, 10.25 h)	72.6° 23:50	11.2	24%	118.1°
2044-11-25 Fri	100	—	unknown	18:45–05:00 (good, 10.25 h)	72.6° 23:50	11.23	32%	106.3°
2044-11-26 Sat	100	—	unknown	18:50–04:55 (good, 10.08 h)	72.6° 23:45	11.25	41%	94.4°
2044-11-27 Sun	100	—	unknown	18:50–04:50 (good, 10.0 h)	72.6° 23:40	11.27	51%	82.3°
2044-11-28 Mon	100	—	unknown	19:10–04:45 (good, 9.58 h)	72.6° 23:35	11.29	61%	69.9°
2044-11-29 Tue	97	—	unknown	20:55–04:45 (good, 7.83 h)	72.5° 23:30	11.31	70%	57.2°
2044-11-30 Wed	87	—	unknown	00:45–04:40 (good, 3.92 h)	72.6° 23:30	11.32	80%	44.1°
2044-12-01 Thu	70	—	unknown	04:20–04:35 (good, 0.25 h)	72.6° 23:25	11.34	88%	30.5°
2044-12-02 Fri	36	—	unknown	23:45–04:40 (marginal, 4.92 h)	72.6° 23:20	11.36	94%	16.5°
2044-12-03 Sat	24	—	unknown	02:35–04:15 (marginal, 1.67 h)	72.6° 23:15	11.37	98%	2.2°
2044-12-04 Sun	24	—	unknown	18:35–20:35 (marginal, 2.0 h)	72.6° 23:15	11.39	100%	12.8°
2044-12-05 Mon	30	—	unknown	18:35–22:10 (marginal, 3.58 h)	72.6° 23:10	11.4	98%	27.8°
2044-12-06 Tue	53	—	unknown	18:35–02:55 (marginal, 8.33 h)	72.6° 23:05	11.42	94%	42.8°
2044-12-07 Wed	89	—	unknown	18:35–22:40 (good, 4.08 h)	72.6° 23:00	11.43	88%	57.8°
2044-12-08 Thu	99	—	unknown	18:35–02:00 (good, 7.42 h)	72.6° 22:55	11.44	79%	72.5°
2044-12-09 Fri	100	—	unknown	18:35–03:40 (good, 9.08 h)	72.6° 22:55	11.45	68%	86.9°
2044-12-10 Sat	100	—	unknown	18:35–03:45 (good, 9.17 h)	72.6° 22:50	11.46	58%	101.0°
2044-12-11 Sun	100	—	unknown	18:35–03:50 (good, 9.25 h)	72.6° 22:45	11.47	47%	114.7°
2044-12-12 Mon	100	—	unknown	18:35–03:50 (good, 9.25 h)	72.6° 22:40	11.48	36%	128.0°
2044-12-13 Tue	100	—	unknown	18:35–03:45 (good, 9.17 h)	72.6° 22:35	11.48	26%	141.0°
2044-12-14 Wed	100	—	unknown	18:35–03:45 (good, 9.17 h)	72.6° 22:35	11.49	18%	153.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-11-15&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.