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: 08-01 (100), 08-02 (100), 08-03 (100), 08-04 (100), 08-05 (100) — by astronomy; check the weather when the night is within four days.

2032-07-27astronomy score per night — click a bar for that night2032-08-25

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-08-15 Sun	100	—	unknown	22:30–04:50 (good, 6.33 h)	89.7° 04:25	6.67	67%	123.7°
2032-08-16 Mon	100	—	unknown	22:30–04:50 (good, 6.33 h)	89.6° 04:20	6.73	77%	112.8°
2032-08-17 Tue	100	—	unknown	22:35–04:50 (good, 6.25 h)	89.5° 04:20	6.79	86%	101.1°
2032-08-18 Wed	100	—	unknown	23:00–04:55 (good, 5.92 h)	89.7° 04:15	6.85	93%	88.7°
2032-08-19 Thu	74	—	unknown	00:40–04:55 (good, 4.25 h)	89.8° 04:10	6.9	98%	76.2°
2032-08-20 Fri	63	—	unknown	04:15–04:55 (good, 0.67 h)	89.7° 04:05	6.96	100%	63.8°
2032-08-21 Sat	45	—	unknown	21:55–04:55 (marginal, 7.0 h)	89.6° 04:00	7.02	99%	52.1°
2032-08-22 Sun	37	—	unknown	21:55–05:00 (marginal, 7.08 h)	89.6° 04:00	7.08	95%	42.0°
2032-08-23 Mon	41	—	unknown	21:50–05:00 (marginal, 7.17 h)	89.7° 03:55	7.13	88%	35.0°
2032-08-24 Tue	68	—	unknown	21:50–22:05 (good, 0.25 h)	89.8° 03:50	7.19	80%	32.8°
2032-08-25 Wed	83	—	unknown	21:50–01:35 (good, 3.75 h)	89.7° 03:45	7.25	70%	35.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-27&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.