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: 06-18 (41), 06-19 (41), 06-17 (40), 06-16 (39), 06-20 (38) — by astronomy; check the weather when the night is within four days.

2032-05-28astronomy score per night — click a bar for that night2032-06-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-28 Fri	9	—	unknown	03:00–03:50 (marginal, 0.83 h)	89.7° 09:35	4.93	82%	86.4°
2032-05-29 Sat	9	—	unknown	02:55–03:50 (marginal, 0.92 h)	89.5° 09:30	4.89	72%	74.3°
2032-05-30 Sun	10	—	unknown	02:50–03:45 (marginal, 0.92 h)	89.6° 09:30	4.85	61%	62.6°
2032-05-31 Mon	11	—	unknown	02:50–04:35 (marginal, 1.75 h)	89.7° 09:25	4.81	49%	51.7°
2032-06-01 Tue	14	—	unknown	03:35–03:45 (good, 0.17 h)	89.7° 09:20	4.78	38%	42.2°
2032-06-02 Wed	17	—	unknown	03:25–03:45 (good, 0.33 h)	89.6° 09:15	4.74	28%	35.1°
2032-06-03 Thu	20	—	unknown	03:10–03:45 (good, 0.58 h)	89.5° 09:15	4.71	18%	32.2°
2032-06-04 Fri	23	—	unknown	03:05–03:40 (good, 0.58 h)	89.6° 09:10	4.68	11%	34.2°
2032-06-05 Sat	24	—	unknown	03:00–03:40 (good, 0.67 h)	89.7° 09:05	4.65	5%	40.2°
2032-06-06 Sun	25	—	unknown	02:55–03:40 (good, 0.75 h)	89.7° 09:00	4.62	1%	48.7°
2032-06-07 Mon	26	—	unknown	02:55–03:40 (good, 0.75 h)	89.6° 08:55	4.59	0%	58.3°
2032-06-08 Tue	28	—	unknown	02:50–03:40 (good, 0.83 h)	89.5° 08:55	4.57	1%	68.5°
2032-06-09 Wed	29	—	unknown	02:45–03:40 (good, 0.92 h)	89.7° 08:50	4.54	4%	78.8°
2032-06-10 Thu	30	—	unknown	02:40–03:40 (good, 1.0 h)	89.8° 08:45	4.52	8%	89.1°
2032-06-11 Fri	32	—	unknown	02:35–03:40 (good, 1.08 h)	89.7° 08:40	4.5	14%	99.3°
2032-06-12 Sat	33	—	unknown	02:35–03:40 (good, 1.08 h)	89.5° 08:35	4.49	22%	109.2°
2032-06-13 Sun	35	—	unknown	02:30–03:40 (good, 1.17 h)	89.6° 08:35	4.47	30%	118.8°
2032-06-14 Mon	36	—	unknown	02:25–03:40 (good, 1.25 h)	89.7° 08:30	4.46	39%	127.9°
2032-06-15 Tue	37	—	unknown	02:20–03:40 (good, 1.33 h)	89.7° 08:25	4.45	48%	136.2°
2032-06-16 Wed	39	—	unknown	02:20–03:40 (good, 1.33 h)	89.6° 08:20	4.44	58%	142.9°
2032-06-17 Thu	40	—	unknown	02:15–03:40 (good, 1.42 h)	89.5° 08:20	4.43	67%	147.1°
2032-06-18 Fri	41	—	unknown	02:15–03:40 (good, 1.42 h)	89.6° 08:15	4.43	76%	147.3°
2032-06-19 Sat	41	—	unknown	02:15–03:40 (good, 1.42 h)	89.7° 08:10	4.42	85%	143.3°
2032-06-20 Sun	38	—	unknown	02:10–03:40 (good, 1.5 h)	89.7° 08:05	4.42	92%	135.8°
2032-06-21 Mon	38	—	unknown	02:10–03:40 (good, 1.5 h)	89.6° 08:00	4.42	97%	126.1°
2032-06-22 Tue	36	—	unknown	02:10–03:40 (good, 1.5 h)	89.5° 08:00	4.43	100%	114.9°
2032-06-23 Wed	32	—	unknown	02:15–03:40 (good, 1.42 h)	89.7° 07:55	4.43	100%	103.0°
2032-06-24 Thu	27	—	unknown	02:40–03:40 (good, 1.0 h)	89.8° 07:50	4.44	97%	90.6°
2032-06-25 Fri	24	—	unknown	03:35–03:40 (good, 0.08 h)	89.7° 07:45	4.45	91%	78.1°
2032-06-26 Sat	23	—	unknown	01:10–03:40 (marginal, 2.5 h)	89.5° 07:40	4.46	84%	65.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-28&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.