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: 10-23 (100), 10-24 (100), 10-25 (100), 10-26 (100), 10-27 (100) — by astronomy; check the weather when the night is within four days.

2046-10-14astronomy score per night — click a bar for that night2046-11-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-10-14 Sun	35	—	unknown	01:10–06:05 (marginal, 4.92 h)	72.6° 03:35	9.78	100%	38.6°
2046-10-15 Mon	22	—	unknown	04:10–06:05 (marginal, 1.92 h)	72.6° 03:30	9.83	99%	26.7°
2046-10-16 Tue	20	—	unknown	04:45–06:05 (marginal, 1.33 h)	72.6° 03:25	9.87	96%	14.7°
2046-10-17 Wed	23	—	unknown	22:25–01:45 (marginal, 3.33 h)	72.6° 03:25	9.91	92%	2.6°
2046-10-18 Thu	32	—	unknown	22:05–06:10 (marginal, 8.08 h)	72.6° 03:20	9.96	86%	9.7°
2046-10-19 Fri	46	—	unknown	21:50–06:10 (marginal, 8.33 h)	72.6° 03:15	10.0	78%	22.1°
2046-10-20 Sat	59	—	unknown	21:40–06:10 (marginal, 8.5 h)	72.6° 03:10	10.04	70%	34.8°
2046-10-21 Sun	85	—	unknown	22:00–05:30 (good, 7.5 h)	72.6° 03:10	10.08	60%	47.7°
2046-10-22 Mon	93	—	unknown	22:00–06:10 (good, 8.17 h)	72.6° 03:05	10.12	49%	61.0°
2046-10-23 Tue	100	—	unknown	21:55–06:15 (good, 8.33 h)	72.6° 03:00	10.16	38%	74.7°
2046-10-24 Wed	100	—	unknown	21:50–06:15 (good, 8.42 h)	72.6° 02:55	10.2	28%	88.7°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-10-14&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.