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: 10-16 (100), 10-17 (100), 10-18 (100), 10-19 (100), 10-20 (100) — by astronomy; check the weather when the night is within four days.

2033-10-13astronomy score per night — click a bar for that night2033-11-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-10-13 Thu	81	—	unknown	22:30–03:10 (good, 4.67 h)	72.5° 03:40	9.75	63%	36.7°
2033-10-14 Fri	88	—	unknown	22:30–06:05 (good, 7.58 h)	72.5° 03:35	9.79	53%	49.6°
2033-10-15 Sat	96	—	unknown	22:25–06:05 (good, 7.67 h)	72.5° 03:30	9.83	43%	62.3°
2033-10-16 Sun	100	—	unknown	22:20–06:05 (good, 7.75 h)	72.5° 03:25	9.88	33%	74.6°
2033-10-17 Mon	100	—	unknown	22:15–06:05 (good, 7.83 h)	72.5° 03:20	9.92	24%	86.8°
2033-10-18 Tue	100	—	unknown	22:10–06:10 (good, 8.0 h)	72.5° 03:20	9.96	16%	98.7°
2033-10-19 Wed	100	—	unknown	22:10–06:10 (good, 8.0 h)	72.5° 03:15	10.0	10%	110.5°
2033-10-20 Thu	100	—	unknown	22:05–06:10 (good, 8.08 h)	72.5° 03:10	10.05	5%	122.3°
2033-10-21 Fri	100	—	unknown	22:00–06:10 (good, 8.17 h)	72.5° 03:05	10.09	2%	133.9°
2033-10-22 Sat	100	—	unknown	21:55–06:10 (good, 8.25 h)	72.5° 03:05	10.13	0%	145.4°
2033-10-23 Sun	100	—	unknown	21:55–06:15 (good, 8.33 h)	72.5° 03:00	10.17	0%	156.8°
2033-10-24 Mon	100	—	unknown	21:50–06:15 (good, 8.42 h)	72.5° 02:55	10.21	2%	167.3°
2033-10-25 Tue	100	—	unknown	21:45–06:15 (good, 8.5 h)	72.5° 02:50	10.25	6%	171.8°
2033-10-26 Wed	100	—	unknown	21:40–06:15 (good, 8.58 h)	72.5° 02:45	10.29	12%	163.7°
2033-10-27 Thu	100	—	unknown	21:35–06:15 (good, 8.67 h)	72.5° 02:45	10.33	19%	152.4°
2033-10-28 Fri	100	—	unknown	21:35–06:20 (good, 8.75 h)	72.5° 02:40	10.36	27%	140.3°
2033-10-29 Sat	100	—	unknown	21:30–05:20 (good, 8.83 h)	72.5° 02:35	10.4	37%	127.8°
2033-10-30 Sun	100	—	unknown	20:30–05:20 (good, 8.83 h)	72.5° 01:30	10.44	47%	114.9°
2033-10-31 Mon	100	—	unknown	20:35–05:20 (good, 8.75 h)	72.5° 01:25	10.48	58%	101.6°
2033-11-01 Tue	100	—	unknown	20:40–05:25 (good, 8.75 h)	72.5° 01:25	10.51	69%	87.8°
2033-11-02 Wed	100	—	unknown	21:45–05:25 (good, 7.67 h)	72.5° 01:20	10.55	79%	73.7°
2033-11-03 Thu	97	—	unknown	00:25–05:25 (good, 5.0 h)	72.5° 01:15	10.58	88%	59.2°
2033-11-04 Fri	87	—	unknown	04:55–05:25 (good, 0.5 h)	72.5° 01:10	10.62	94%	44.5°
2033-11-05 Sat	39	—	unknown	01:00–05:25 (marginal, 4.42 h)	72.5° 01:10	10.65	99%	29.8°
2033-11-06 Sun	29	—	unknown	02:40–05:30 (marginal, 2.83 h)	72.5° 01:05	10.69	100%	15.7°
2033-11-07 Mon	27	—	unknown	20:00–22:50 (marginal, 2.83 h)	72.5° 01:00	10.72	98%	8.1°
2033-11-08 Tue	37	—	unknown	19:40–00:50 (marginal, 5.17 h)	72.5° 00:55	10.75	94%	18.0°
2033-11-09 Wed	61	—	unknown	19:45–19:50 (good, 0.08 h)	72.5° 00:50	10.79	87%	31.4°
2033-11-10 Thu	85	—	unknown	19:40–23:30 (good, 3.83 h)	72.5° 00:50	10.82	79%	44.9°
2033-11-11 Fri	93	—	unknown	19:40–03:15 (good, 7.58 h)	72.5° 00:45	10.85	69%	58.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-10-13&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.