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 Andromeda Galaxy: 11-09 (100), 11-10 (100), 11-11 (100), 11-12 (100), 11-13 (100) — by astronomy; check the weather when the night is within four days.

2033-11-09astronomy score per night — click a bar for that night2033-12-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-11-09 Wed	100	—	unknown	18:45–00:40 (good, 5.92 h)	89.6° 21:50	10.79	87%	70.0°
2033-11-10 Thu	100	—	unknown	18:45–02:15 (good, 7.5 h)	89.7° 21:45	10.82	79%	81.2°
2033-11-11 Fri	100	—	unknown	18:40–03:20 (good, 8.67 h)	89.7° 21:40	10.85	69%	92.2°
2033-11-12 Sat	100	—	unknown	18:40–03:30 (good, 8.83 h)	89.6° 21:35	10.88	59%	102.8°
2033-11-13 Sun	100	—	unknown	18:40–03:35 (good, 8.92 h)	89.5° 21:35	10.91	49%	112.9°
2033-11-14 Mon	100	—	unknown	18:40–03:35 (good, 8.92 h)	89.7° 21:30	10.94	40%	122.2°
2033-11-15 Tue	100	—	unknown	18:40–03:30 (good, 8.83 h)	89.8° 21:25	10.97	30%	130.7°
2033-11-16 Wed	100	—	unknown	18:40–03:30 (good, 8.83 h)	89.7° 21:20	11.0	22%	137.9°
2033-11-17 Thu	100	—	unknown	18:40–03:25 (good, 8.75 h)	89.6° 21:15	11.02	15%	143.0°
2033-11-18 Fri	100	—	unknown	18:40–03:20 (good, 8.67 h)	89.6° 21:15	11.05	9%	145.3°
2033-11-19 Sat	100	—	unknown	18:35–03:20 (good, 8.75 h)	89.7° 21:10	11.08	4%	144.1°
2033-11-20 Sun	100	—	unknown	18:35–03:15 (good, 8.67 h)	89.8° 21:05	11.1	1%	139.8°
2033-11-21 Mon	100	—	unknown	18:35–03:10 (good, 8.58 h)	89.7° 21:00	11.13	0%	133.1°
2033-11-22 Tue	100	—	unknown	18:35–03:05 (good, 8.5 h)	89.5° 20:55	11.15	1%	124.8°
2033-11-23 Wed	100	—	unknown	18:35–03:00 (good, 8.42 h)	89.6° 20:55	11.17	4%	115.5°
2033-11-24 Thu	100	—	unknown	18:35–03:00 (good, 8.42 h)	89.7° 20:50	11.2	8%	105.5°
2033-11-25 Fri	100	—	unknown	18:35–02:55 (good, 8.33 h)	89.7° 20:45	11.22	14%	95.1°
2033-11-26 Sat	100	—	unknown	18:35–02:50 (good, 8.25 h)	89.6° 20:40	11.24	22%	84.5°
2033-11-27 Sun	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.5° 20:40	11.26	32%	73.8°
2033-11-28 Mon	100	—	unknown	18:35–02:45 (good, 8.17 h)	89.7° 20:35	11.28	42%	63.2°
2033-11-29 Tue	92	—	unknown	18:35–02:40 (good, 8.08 h)	89.8° 20:30	11.3	53%	53.0°
2033-11-30 Wed	84	—	unknown	18:35–02:35 (good, 8.0 h)	89.7° 20:25	11.32	64%	44.0°
2033-12-01 Thu	59	—	unknown	18:35–03:05 (marginal, 8.5 h)	89.6° 20:20	11.34	75%	37.3°
2033-12-02 Fri	43	—	unknown	18:35–02:45 (marginal, 8.17 h)	89.6° 20:20	11.35	84%	34.7°
2033-12-03 Sat	36	—	unknown	18:35–02:25 (marginal, 7.83 h)	89.7° 20:15	11.37	92%	37.4°
2033-12-04 Sun	39	—	unknown	18:35–02:05 (marginal, 7.5 h)	89.8° 20:10	11.38	97%	44.4°
2033-12-05 Mon	52	—	unknown	18:35–02:00 (marginal, 7.42 h)	89.7° 20:05	11.4	100%	54.0°
2033-12-06 Tue	67	—	unknown	18:35–20:10 (good, 1.58 h)	89.5° 20:00	11.41	99%	64.9°
2033-12-07 Wed	77	—	unknown	18:35–22:55 (good, 4.33 h)	89.6° 20:00	11.42	96%	76.3°
2033-12-08 Thu	100	—	unknown	18:35–00:25 (good, 5.83 h)	89.7° 19:55	11.44	91%	87.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-11-09&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.