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: 07-17 (100), 07-18 (100), 07-19 (100), 07-16 (99), 07-15 (98) — by astronomy; check the weather when the night is within four days.

2032-06-26astronomy score per night — click a bar for that night2032-07-25

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-06-26 Sat	23	—	unknown	01:10–03:40 (marginal, 2.5 h)	89.5° 07:40	4.46	84%	65.9°
2032-06-27 Sun	24	—	unknown	01:05–03:40 (marginal, 2.58 h)	89.6° 07:40	4.48	74%	54.5°
2032-06-28 Mon	27	—	unknown	00:55–03:40 (marginal, 2.75 h)	89.7° 07:35	4.49	63%	44.3°
2032-06-29 Tue	32	—	unknown	01:55–03:45 (good, 1.83 h)	89.7° 07:30	4.51	52%	36.6°
2032-06-30 Wed	40	—	unknown	01:40–03:45 (good, 2.08 h)	89.6° 07:25	4.53	41%	32.6°
2032-07-01 Thu	51	—	unknown	01:20–03:45 (good, 2.42 h)	89.5° 07:20	4.55	30%	33.5°
2032-07-02 Fri	59	—	unknown	01:15–03:45 (good, 2.5 h)	89.6° 07:20	4.57	21%	38.6°
2032-07-03 Sat	66	—	unknown	01:10–03:45 (good, 2.58 h)	89.7° 07:15	4.6	13%	46.5°
2032-07-04 Sun	71	—	unknown	01:05–03:45 (good, 2.67 h)	89.7° 07:10	4.63	7%	55.7°
2032-07-05 Mon	74	—	unknown	01:05–03:50 (good, 2.75 h)	89.6° 07:05	4.65	3%	65.6°
2032-07-06 Tue	77	—	unknown	01:00–03:50 (good, 2.83 h)	89.5° 07:05	4.68	1%	75.8°
2032-07-07 Wed	79	—	unknown	00:55–03:50 (good, 2.92 h)	89.7° 07:00	4.72	0%	86.1°
2032-07-08 Thu	80	—	unknown	00:50–03:50 (good, 3.0 h)	89.8° 06:55	4.75	2%	96.3°
2032-07-09 Fri	85	—	unknown	00:45–03:55 (good, 3.17 h)	89.7° 06:50	4.78	5%	106.3°
2032-07-10 Sat	87	—	unknown	00:45–03:55 (good, 3.17 h)	89.5° 06:45	4.82	10%	116.0°
2032-07-11 Sun	89	—	unknown	00:40–03:55 (good, 3.25 h)	89.6° 06:45	4.86	16%	125.2°
2032-07-12 Mon	91	—	unknown	00:35–03:55 (good, 3.33 h)	89.7° 06:40	4.9	24%	133.7°
2032-07-13 Tue	94	—	unknown	00:30–04:00 (good, 3.5 h)	89.7° 06:35	4.94	32%	140.9°
2032-07-14 Wed	97	—	unknown	00:30–04:00 (good, 3.5 h)	89.6° 06:30	4.98	42%	145.9°
2032-07-15 Thu	98	—	unknown	00:30–04:00 (good, 3.5 h)	89.5° 06:25	5.02	52%	147.5°
2032-07-16 Fri	99	—	unknown	00:25–04:00 (good, 3.58 h)	89.6° 06:25	5.07	62%	145.0°
2032-07-17 Sat	100	—	unknown	00:25–04:05 (good, 3.67 h)	89.7° 06:20	5.11	72%	138.9°
2032-07-18 Sun	100	—	unknown	00:20–04:05 (good, 3.75 h)	89.7° 06:15	5.16	81%	130.1°
2032-07-19 Mon	100	—	unknown	00:20–04:05 (good, 3.75 h)	89.6° 06:10	5.2	89%	119.7°
2032-07-20 Tue	83	—	unknown	00:25–04:10 (good, 3.75 h)	89.5° 06:10	5.25	95%	108.1°
2032-07-21 Wed	69	—	unknown	00:30–04:10 (good, 3.67 h)	89.7° 06:05	5.3	99%	95.8°
2032-07-22 Thu	55	—	unknown	01:45–04:10 (good, 2.42 h)	89.8° 06:00	5.35	100%	83.2°
2032-07-23 Fri	44	—	unknown	03:15–04:10 (good, 0.92 h)	89.7° 05:55	5.4	98%	70.6°
2032-07-24 Sat	36	—	unknown	23:25–04:15 (marginal, 4.83 h)	89.5° 05:50	5.45	93%	58.5°
2032-07-25 Sun	34	—	unknown	23:20–04:15 (marginal, 4.92 h)	89.6° 05:50	5.5	86%	47.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-06-26&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.