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: 06-22 (46), 06-21 (45), 06-20 (44), 06-19 (43), 06-23 (42) — by astronomy; check the weather when the night is within four days.

2029-05-31astronomy score per night — click a bar for that night2029-06-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-05-31 Thu	10	—	unknown	02:50–03:45 (marginal, 0.92 h)	89.7° 09:25	4.82	80%	83.0°
2029-06-01 Fri	11	—	unknown	02:45–03:45 (marginal, 1.0 h)	89.6° 09:20	4.79	70%	71.7°
2029-06-02 Sat	12	—	unknown	02:40–03:45 (marginal, 1.08 h)	89.5° 09:15	4.75	61%	61.1°
2029-06-03 Sun	14	—	unknown	03:40–03:45 (good, 0.08 h)	89.6° 09:15	4.72	51%	51.1°
2029-06-04 Mon	15	—	unknown	03:30–03:45 (good, 0.25 h)	89.7° 09:10	4.68	42%	42.1°
2029-06-05 Tue	17	—	unknown	03:20–03:40 (good, 0.33 h)	89.7° 09:05	4.65	32%	34.6°
2029-06-06 Wed	20	—	unknown	03:10–03:40 (good, 0.5 h)	89.6° 09:00	4.63	24%	29.7°
2029-06-07 Thu	23	—	unknown	02:55–03:40 (good, 0.75 h)	89.5° 09:00	4.6	16%	28.7°
2029-06-08 Fri	27	—	unknown	02:50–03:40 (good, 0.83 h)	89.7° 08:55	4.57	10%	32.0°
2029-06-09 Sat	28	—	unknown	02:45–03:40 (good, 0.92 h)	89.7° 08:50	4.55	5%	38.6°
2029-06-10 Sun	30	—	unknown	02:40–03:40 (good, 1.0 h)	89.7° 08:45	4.53	2%	47.3°
2029-06-11 Mon	31	—	unknown	02:40–03:40 (good, 1.0 h)	89.5° 08:40	4.51	0%	57.2°
2029-06-12 Tue	33	—	unknown	02:35–03:40 (good, 1.08 h)	89.6° 08:40	4.49	1%	67.8°
2029-06-13 Wed	34	—	unknown	02:30–03:40 (good, 1.17 h)	89.7° 08:35	4.48	3%	79.0°
2029-06-14 Thu	35	—	unknown	02:25–03:40 (good, 1.25 h)	89.7° 08:30	4.46	8%	90.5°
2029-06-15 Fri	37	—	unknown	02:25–03:40 (good, 1.25 h)	89.6° 08:25	4.45	15%	102.2°
2029-06-16 Sat	38	—	unknown	02:20–03:40 (good, 1.33 h)	89.5° 08:20	4.44	24%	113.9°
2029-06-17 Sun	40	—	unknown	02:15–03:40 (good, 1.42 h)	89.6° 08:20	4.43	34%	125.3°
2029-06-18 Mon	41	—	unknown	02:10–03:40 (good, 1.5 h)	89.7° 08:15	4.43	44%	136.1°
2029-06-19 Tue	43	—	unknown	02:05–03:40 (good, 1.58 h)	89.7° 08:10	4.42	56%	145.2°
2029-06-20 Wed	44	—	unknown	02:05–03:40 (good, 1.58 h)	89.6° 08:05	4.42	67%	150.8°
2029-06-21 Thu	45	—	unknown	02:05–03:40 (good, 1.58 h)	89.5° 08:05	4.42	78%	150.6°
2029-06-22 Fri	46	—	unknown	02:05–03:40 (good, 1.58 h)	89.7° 08:00	4.43	87%	144.4°
2029-06-23 Sat	42	—	unknown	02:00–03:40 (good, 1.67 h)	89.7° 07:55	4.43	94%	134.8°
2029-06-24 Sun	42	—	unknown	02:00–03:40 (good, 1.67 h)	89.7° 07:50	4.44	98%	123.5°
2029-06-25 Mon	39	—	unknown	02:00–03:40 (good, 1.67 h)	89.5° 07:45	4.45	100%	111.6°
2029-06-26 Tue	34	—	unknown	02:05–03:40 (good, 1.58 h)	89.6° 07:45	4.46	99%	99.5°
2029-06-27 Wed	29	—	unknown	02:35–03:40 (good, 1.08 h)	89.7° 07:40	4.47	96%	87.5°
2029-06-28 Thu	26	—	unknown	03:35–03:40 (good, 0.08 h)	89.7° 07:35	4.49	91%	76.0°
2029-06-29 Fri	24	—	unknown	01:00–03:40 (marginal, 2.67 h)	89.6° 07:30	4.5	84%	64.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-05-31&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.