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: 11-12 (100), 11-13 (100), 11-14 (100), 11-15 (100), 11-16 (100) — by astronomy; check the weather when the night is within four days.

2033-11-10astronomy score per night — click a bar for that night2033-12-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2033-11-12 Sat	100	—	unknown	19:35–05:00 (good, 9.42 h)	72.5° 00:40	10.88	59%	70.9°
2033-11-13 Sun	100	—	unknown	19:30–05:30 (good, 10.0 h)	72.5° 00:35	10.91	49%	83.3°
2033-11-14 Mon	100	—	unknown	19:25–05:30 (good, 10.08 h)	72.5° 00:30	10.94	40%	95.5°
2033-11-15 Tue	100	—	unknown	19:20–05:35 (good, 10.25 h)	72.5° 00:30	10.97	30%	107.4°
2033-11-16 Wed	100	—	unknown	19:20–05:35 (good, 10.25 h)	72.5° 00:25	11.0	22%	119.1°
2033-11-17 Thu	100	—	unknown	19:15–05:30 (good, 10.25 h)	72.5° 00:20	11.02	15%	130.8°
2033-11-18 Fri	100	—	unknown	19:10–05:25 (good, 10.25 h)	72.5° 00:15	11.05	9%	142.4°
2033-11-19 Sat	100	—	unknown	19:05–05:25 (good, 10.33 h)	72.5° 00:10	11.08	4%	153.8°
2033-11-20 Sun	100	—	unknown	19:05–05:20 (good, 10.25 h)	72.5° 00:10	11.1	1%	164.7°
2033-11-21 Mon	100	—	unknown	19:00–05:15 (good, 10.25 h)	72.5° 00:05	11.13	0%	172.0°
2033-11-22 Tue	100	—	unknown	18:55–05:10 (good, 10.25 h)	72.5° 00:00	11.15	1%	166.3°
2033-11-23 Wed	100	—	unknown	18:50–05:10 (good, 10.33 h)	72.5° 23:55	11.17	4%	155.2°
2033-11-24 Thu	100	—	unknown	18:50–05:05 (good, 10.25 h)	72.5° 23:55	11.2	8%	143.1°
2033-11-25 Fri	100	—	unknown	18:45–05:00 (good, 10.25 h)	72.5° 23:50	11.22	14%	130.6°
2033-11-26 Sat	100	—	unknown	18:40–04:55 (good, 10.25 h)	72.5° 23:45	11.24	22%	117.9°
2033-11-27 Sun	100	—	unknown	18:40–04:50 (good, 10.17 h)	72.5° 23:40	11.26	32%	104.8°
2033-11-28 Mon	100	—	unknown	18:40–04:50 (good, 10.17 h)	72.5° 23:35	11.28	42%	91.5°
2033-11-29 Tue	100	—	unknown	18:50–04:45 (good, 9.92 h)	72.5° 23:35	11.3	53%	77.9°
2033-11-30 Wed	100	—	unknown	19:45–04:40 (good, 8.92 h)	72.5° 23:30	11.32	64%	64.1°
2033-12-01 Thu	92	—	unknown	22:45–04:35 (good, 5.83 h)	72.5° 23:25	11.34	75%	49.9°
2033-12-02 Fri	82	—	unknown	03:45–04:30 (good, 0.75 h)	72.5° 23:20	11.35	84%	35.6°
2033-12-03 Sat	44	—	unknown	18:35–04:45 (marginal, 10.17 h)	72.5° 23:15	11.37	92%	21.6°
2033-12-04 Sun	30	—	unknown	00:55–04:25 (marginal, 3.5 h)	72.5° 23:15	11.38	97%	9.5°
2033-12-05 Mon	28	—	unknown	18:35–21:20 (marginal, 2.75 h)	72.5° 23:10	11.4	100%	12.4°
2033-12-06 Tue	33	—	unknown	18:35–22:15 (marginal, 3.67 h)	72.5° 23:05	11.41	99%	25.3°
2033-12-07 Wed	52	—	unknown	18:35–02:00 (marginal, 7.42 h)	72.5° 23:00	11.42	96%	39.1°
2033-12-08 Thu	89	—	unknown	18:35–21:40 (good, 3.08 h)	72.5° 23:00	11.44	91%	52.7°
2033-12-09 Fri	97	—	unknown	18:35–01:00 (good, 6.42 h)	72.5° 22:55	11.45	84%	66.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-11-10&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.