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: 10-25 (100), 10-26 (100), 10-27 (100), 10-28 (100), 10-29 (100) — by astronomy; check the weather when the night is within four days.

2046-10-25astronomy score per night — click a bar for that night2046-11-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-10-25 Thu	100	—	unknown	21:45–06:15 (good, 8.5 h)	72.6° 02:50	10.24	18%	103.2°
2046-10-26 Fri	100	—	unknown	21:40–06:15 (good, 8.58 h)	72.6° 02:50	10.28	10%	118.0°
2046-10-27 Sat	100	—	unknown	21:40–05:15 (good, 8.58 h)	72.6° 02:45	10.32	4%	133.0°
2046-10-28 Sun	100	—	unknown	20:35–05:20 (good, 8.75 h)	72.6° 01:40	10.36	1%	148.2°
2046-10-29 Mon	100	—	unknown	20:30–05:20 (good, 8.83 h)	72.6° 01:35	10.4	0%	163.2°
2046-10-30 Tue	100	—	unknown	20:25–05:20 (good, 8.92 h)	72.6° 01:30	10.43	3%	178.1°
2046-10-31 Wed	100	—	unknown	20:25–05:20 (good, 8.92 h)	72.6° 01:30	10.47	8%	167.4°
2046-11-01 Thu	100	—	unknown	20:20–05:25 (good, 9.08 h)	72.6° 01:25	10.51	16%	153.3°
2046-11-02 Fri	100	—	unknown	20:15–05:25 (good, 9.17 h)	72.6° 01:20	10.54	25%	139.7°
2046-11-03 Sat	100	—	unknown	20:15–05:25 (good, 9.17 h)	72.6° 01:15	10.58	34%	126.5°
2046-11-04 Sun	100	—	unknown	20:10–05:25 (good, 9.25 h)	72.6° 01:15	10.61	44%	113.8°
2046-11-05 Mon	100	—	unknown	20:15–05:25 (good, 9.17 h)	72.6° 01:10	10.65	54%	101.4°
2046-11-06 Tue	100	—	unknown	20:20–05:30 (good, 9.17 h)	72.6° 01:05	10.68	63%	89.3°
2046-11-07 Wed	100	—	unknown	20:50–05:30 (good, 8.67 h)	72.6° 01:00	10.72	72%	77.4°
2046-11-08 Thu	100	—	unknown	22:20–05:30 (good, 7.17 h)	72.6° 00:55	10.75	80%	65.5°
2046-11-09 Fri	93	—	unknown	01:15–05:30 (good, 4.25 h)	72.6° 00:55	10.78	87%	53.7°
2046-11-10 Sat	85	—	unknown	04:50–05:30 (good, 0.67 h)	72.6° 00:50	10.81	93%	41.9°
2046-11-11 Sun	42	—	unknown	00:40–05:35 (marginal, 4.92 h)	72.6° 00:45	10.84	97%	29.9°
2046-11-12 Mon	31	—	unknown	02:10–05:35 (marginal, 3.42 h)	72.6° 00:40	10.87	99%	17.9°
2046-11-13 Tue	24	—	unknown	03:45–05:35 (marginal, 1.83 h)	72.6° 00:35	10.91	100%	5.7°
2046-11-14 Wed	25	—	unknown	19:35–21:45 (marginal, 2.17 h)	72.6° 00:35	10.93	98%	6.6°
2046-11-15 Thu	33	—	unknown	19:15–23:35 (marginal, 4.33 h)	72.6° 00:30	10.96	95%	19.2°
2046-11-16 Fri	48	—	unknown	18:50–02:45 (marginal, 7.92 h)	72.6° 00:25	10.99	90%	31.9°
2046-11-17 Sat	82	—	unknown	19:15–20:00 (good, 0.75 h)	72.6° 00:20	11.02	83%	44.8°
2046-11-18 Sun	91	—	unknown	19:10–02:10 (good, 7.0 h)	72.6° 00:20	11.05	74%	57.9°
2046-11-19 Mon	100	—	unknown	19:10–04:10 (good, 9.0 h)	72.6° 00:15	11.07	64%	71.3°
2046-11-20 Tue	100	—	unknown	19:05–05:00 (good, 9.92 h)	72.6° 00:10	11.1	54%	84.9°
2046-11-21 Wed	100	—	unknown	19:00–05:05 (good, 10.08 h)	72.6° 00:05	11.12	43%	98.8°
2046-11-22 Thu	100	—	unknown	18:55–05:10 (good, 10.25 h)	72.6° 00:00	11.15	32%	113.0°
2046-11-23 Fri	100	—	unknown	18:50–05:05 (good, 10.25 h)	72.6° 00:00	11.17	21%	127.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-10-25&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.