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), 08-01 (100), 08-02 (100) — by astronomy; check the weather when the night is within four days.

2032-07-16astronomy score per night — click a bar for that night2032-08-14

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-07-26 Mon	37	—	unknown	23:10–04:15 (marginal, 5.08 h)	89.7° 05:45	5.55	76%	38.7°
2032-07-27 Tue	47	—	unknown	23:05–04:20 (marginal, 5.25 h)	89.7° 05:40	5.61	66%	33.4°
2032-07-28 Wed	75	—	unknown	23:35–04:20 (good, 4.75 h)	89.6° 05:35	5.66	55%	33.1°
2032-07-29 Thu	85	—	unknown	23:30–04:20 (good, 4.83 h)	89.5° 05:30	5.71	44%	37.4°
2032-07-30 Fri	90	—	unknown	23:25–04:25 (good, 5.0 h)	89.6° 05:30	5.77	34%	44.7°
2032-07-31 Sat	96	—	unknown	23:20–04:25 (good, 5.08 h)	89.7° 05:25	5.82	25%	53.7°
2032-08-01 Sun	100	—	unknown	23:15–04:25 (good, 5.17 h)	89.7° 05:20	5.88	16%	63.4°
2032-08-02 Mon	100	—	unknown	23:15–04:30 (good, 5.25 h)	89.6° 05:15	5.93	10%	73.4°
2032-08-03 Tue	100	—	unknown	23:10–04:30 (good, 5.33 h)	89.5° 05:15	5.99	5%	83.6°
2032-08-04 Wed	100	—	unknown	23:05–04:30 (good, 5.42 h)	89.7° 05:10	6.05	2%	93.7°
2032-08-05 Thu	100	—	unknown	23:00–04:35 (good, 5.58 h)	89.8° 05:05	6.1	0%	103.7°
2032-08-06 Fri	100	—	unknown	22:55–04:35 (good, 5.67 h)	89.7° 05:00	6.16	1%	113.4°
2032-08-07 Sat	100	—	unknown	22:55–04:35 (good, 5.67 h)	89.5° 04:55	6.22	3%	122.7°
2032-08-08 Sun	100	—	unknown	22:50–04:35 (good, 5.75 h)	89.6° 04:55	6.27	7%	131.4°
2032-08-09 Mon	100	—	unknown	22:45–04:40 (good, 5.92 h)	89.7° 04:50	6.33	12%	138.9°
2032-08-10 Tue	100	—	unknown	22:40–04:40 (good, 6.0 h)	89.8° 04:45	6.39	19%	144.6°
2032-08-11 Wed	100	—	unknown	22:40–04:40 (good, 6.0 h)	89.7° 04:40	6.44	27%	147.2°
2032-08-12 Thu	100	—	unknown	22:35–04:45 (good, 6.17 h)	89.5° 04:35	6.5	36%	145.9°
2032-08-13 Fri	100	—	unknown	22:35–04:45 (good, 6.17 h)	89.6° 04:35	6.56	46%	141.0°
2032-08-14 Sat	100	—	unknown	22:30–04:45 (good, 6.25 h)	89.7° 04:30	6.62	56%	133.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-16&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.