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: 10-06 (100), 10-07 (100), 10-08 (100), 10-09 (100), 10-10 (100) — by astronomy; check the weather when the night is within four days.

2034-10-03astronomy score per night — click a bar for that night2034-11-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-10-03 Tue	67	—	unknown	23:40–03:40 (good, 4.0 h)	72.5° 04:20	9.28	59%	31.6°
2034-10-04 Wed	86	—	unknown	23:10–05:50 (good, 6.67 h)	72.5° 04:15	9.33	48%	45.1°
2034-10-05 Thu	94	—	unknown	23:05–05:55 (good, 6.83 h)	72.5° 04:10	9.37	37%	58.4°
2034-10-06 Fri	100	—	unknown	23:00–05:55 (good, 6.92 h)	72.5° 04:05	9.42	27%	71.6°
2034-10-07 Sat	100	—	unknown	22:55–05:55 (good, 7.0 h)	72.5° 04:05	9.47	18%	84.6°
2034-10-08 Sun	100	—	unknown	22:55–05:55 (good, 7.0 h)	72.5° 04:00	9.51	11%	97.3°
2034-10-09 Mon	100	—	unknown	22:50–06:00 (good, 7.17 h)	72.5° 03:55	9.56	6%	109.8°
2034-10-10 Tue	100	—	unknown	22:45–06:00 (good, 7.25 h)	72.5° 03:50	9.6	2%	122.1°
2034-10-11 Wed	100	—	unknown	22:40–06:00 (good, 7.33 h)	72.5° 03:45	9.65	0%	134.2°
2034-10-12 Thu	100	—	unknown	22:35–06:00 (good, 7.42 h)	72.5° 03:45	9.69	0%	146.0°
2034-10-13 Fri	100	—	unknown	22:35–06:00 (good, 7.42 h)	72.5° 03:40	9.74	2%	157.3°
2034-10-14 Sat	100	—	unknown	22:30–06:05 (good, 7.58 h)	72.5° 03:35	9.78	6%	167.3°
2034-10-15 Sun	100	—	unknown	22:25–06:05 (good, 7.67 h)	72.5° 03:30	9.82	12%	170.7°
2034-10-16 Mon	100	—	unknown	22:20–06:05 (good, 7.75 h)	72.5° 03:25	9.87	18%	163.0°
2034-10-17 Tue	100	—	unknown	22:15–06:05 (good, 7.83 h)	72.5° 03:25	9.91	26%	152.3°
2034-10-18 Wed	100	—	unknown	22:15–06:05 (good, 7.83 h)	72.5° 03:20	9.95	35%	140.9°
2034-10-19 Thu	100	—	unknown	22:15–06:10 (good, 7.92 h)	72.5° 03:15	9.99	44%	129.0°
2034-10-20 Fri	100	—	unknown	22:10–06:10 (good, 8.0 h)	72.5° 03:10	10.04	54%	116.9°
2034-10-21 Sat	100	—	unknown	22:15–06:10 (good, 7.92 h)	72.5° 03:05	10.08	64%	104.4°
2034-10-22 Sun	100	—	unknown	22:20–06:10 (good, 7.83 h)	72.5° 03:05	10.12	74%	91.4°
2034-10-23 Mon	100	—	unknown	23:15–06:15 (good, 7.0 h)	72.5° 03:00	10.16	83%	78.0°
2034-10-24 Tue	100	—	unknown	01:10–06:15 (good, 5.08 h)	72.5° 02:55	10.2	90%	64.2°
2034-10-25 Wed	91	—	unknown	04:40–06:15 (good, 1.58 h)	72.5° 02:50	10.24	96%	49.9°
2034-10-26 Thu	41	—	unknown	00:15–06:15 (marginal, 6.0 h)	72.5° 02:50	10.28	99%	35.4°
2034-10-27 Fri	27	—	unknown	03:45–06:15 (marginal, 2.5 h)	72.5° 02:45	10.32	100%	21.2°
2034-10-28 Sat	25	—	unknown	21:40–00:35 (marginal, 2.92 h)	72.5° 02:40	10.35	97%	9.7°
2034-10-29 Sun	35	—	unknown	20:20–05:20 (marginal, 9.0 h)	72.5° 01:35	10.39	91%	14.0°
2034-10-30 Mon	50	—	unknown	20:00–05:20 (marginal, 9.33 h)	72.5° 01:30	10.43	84%	27.1°
2034-10-31 Tue	83	—	unknown	20:20–00:05 (good, 3.75 h)	72.5° 01:30	10.47	74%	41.1°
2034-11-01 Wed	91	—	unknown	20:20–04:10 (good, 7.83 h)	72.5° 01:25	10.5	63%	54.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-10-03&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.