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: 11-17 (100), 11-18 (100), 11-27 (100), 11-28 (100), 11-29 (100) — by astronomy; check the weather when the night is within four days.

2034-11-17astronomy score per night — click a bar for that night2034-12-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-11-17 Fri	100	—	unknown	18:40–03:25 (good, 8.75 h)	89.6° 21:20	11.02	38%	77.1°
2034-11-18 Sat	100	—	unknown	18:40–03:25 (good, 8.75 h)	89.7° 21:15	11.04	47%	67.2°
2034-11-19 Sun	96	—	unknown	18:35–03:20 (good, 8.75 h)	89.8° 21:10	11.07	58%	57.6°
2034-11-20 Mon	88	—	unknown	18:35–03:15 (good, 8.67 h)	89.7° 21:05	11.1	68%	48.6°
2034-11-21 Tue	78	—	unknown	02:40–03:10 (good, 0.5 h)	89.5° 21:00	11.12	78%	41.2°
2034-11-22 Wed	48	—	unknown	18:35–03:30 (marginal, 8.92 h)	89.6° 21:00	11.15	87%	36.8°
2034-11-23 Thu	40	—	unknown	18:35–03:10 (marginal, 8.58 h)	89.7° 20:55	11.17	94%	37.0°
2034-11-24 Fri	43	—	unknown	18:35–02:45 (marginal, 8.17 h)	89.7° 20:50	11.19	98%	42.2°
2034-11-25 Sat	56	—	unknown	18:35–02:40 (marginal, 8.08 h)	89.6° 20:45	11.21	100%	50.9°
2034-11-26 Sun	68	—	unknown	18:35–20:15 (good, 1.67 h)	89.5° 20:45	11.24	98%	61.6°
2034-11-27 Mon	100	—	unknown	18:35–23:20 (good, 4.75 h)	89.7° 20:40	11.26	94%	73.1°
2034-11-28 Tue	100	—	unknown	18:35–01:00 (good, 6.42 h)	89.8° 20:35	11.28	87%	84.9°
2034-11-29 Wed	100	—	unknown	18:35–02:10 (good, 7.58 h)	89.7° 20:30	11.3	78%	96.5°
2034-11-30 Thu	100	—	unknown	18:35–02:20 (good, 7.75 h)	89.6° 20:25	11.31	68%	107.6°
2034-12-01 Fri	100	—	unknown	18:35–02:25 (good, 7.83 h)	89.6° 20:25	11.33	58%	117.9°
2034-12-02 Sat	100	—	unknown	18:35–02:20 (good, 7.75 h)	89.7° 20:20	11.35	48%	127.1°
2034-12-03 Sun	100	—	unknown	18:35–02:20 (good, 7.75 h)	89.8° 20:15	11.36	38%	134.8°
2034-12-04 Mon	100	—	unknown	18:35–02:20 (good, 7.75 h)	89.7° 20:10	11.38	28%	140.5°
2034-12-05 Tue	100	—	unknown	18:35–02:15 (good, 7.67 h)	89.5° 20:05	11.39	20%	143.4°
2034-12-06 Wed	100	—	unknown	18:35–02:10 (good, 7.58 h)	89.6° 20:05	11.41	13%	143.0°
2034-12-07 Thu	100	—	unknown	18:35–02:10 (good, 7.58 h)	89.7° 20:00	11.42	8%	139.5°
2034-12-08 Fri	100	—	unknown	18:35–02:05 (good, 7.5 h)	89.8° 19:55	11.43	3%	133.6°
2034-12-09 Sat	100	—	unknown	18:35–02:00 (good, 7.42 h)	89.6° 19:50	11.44	1%	126.2°
2034-12-10 Sun	100	—	unknown	18:35–01:55 (good, 7.33 h)	89.5° 19:50	11.45	0%	117.7°
2034-12-11 Mon	100	—	unknown	18:35–01:50 (good, 7.25 h)	89.7° 19:45	11.46	1%	108.6°
2034-12-12 Tue	100	—	unknown	18:35–01:50 (good, 7.25 h)	89.8° 19:40	11.47	4%	99.1°
2034-12-13 Wed	100	—	unknown	18:35–01:45 (good, 7.17 h)	89.7° 19:35	11.48	9%	89.4°
2034-12-14 Thu	100	—	unknown	18:35–01:40 (good, 7.08 h)	89.6° 19:30	11.49	15%	79.6°
2034-12-15 Fri	100	—	unknown	18:35–01:35 (good, 7.0 h)	89.5° 19:30	11.49	22%	69.8°
2034-12-16 Sat	99	—	unknown	18:35–01:35 (good, 7.0 h)	89.7° 19:25	11.5	31%	60.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-11-17&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.