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: 07-18 (99), 07-16 (97), 07-17 (97), 07-15 (96), 07-19 (96) — by astronomy; check the weather when the night is within four days.

2043-07-01astronomy score per night — click a bar for that night2043-07-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2043-07-01 Wed	49	—	unknown	01:20–03:45 (good, 2.42 h)	89.8° 07:25	4.53	30%	31.3°
2043-07-02 Thu	56	—	unknown	01:20–03:45 (good, 2.42 h)	89.6° 07:20	4.56	20%	35.4°
2043-07-03 Fri	63	—	unknown	01:15–03:45 (good, 2.5 h)	89.6° 07:20	4.58	11%	43.7°
2043-07-04 Sat	70	—	unknown	01:10–03:45 (good, 2.58 h)	89.7° 07:15	4.61	5%	54.4°
2043-07-05 Sun	71	—	unknown	01:05–03:45 (good, 2.67 h)	89.8° 07:10	4.63	1%	66.3°
2043-07-06 Mon	75	—	unknown	01:00–03:50 (good, 2.83 h)	89.7° 07:05	4.66	0%	78.6°
2043-07-07 Tue	77	—	unknown	01:00–03:50 (good, 2.83 h)	89.6° 07:00	4.69	2%	90.9°
2043-07-08 Wed	79	—	unknown	00:55–03:50 (good, 2.92 h)	89.6° 07:00	4.73	6%	102.8°
2043-07-09 Thu	81	—	unknown	00:50–03:50 (good, 3.0 h)	89.8° 06:55	4.76	13%	114.2°
2043-07-10 Fri	85	—	unknown	00:45–03:55 (good, 3.17 h)	89.8° 06:50	4.8	21%	124.8°
2043-07-11 Sat	87	—	unknown	00:40–03:55 (good, 3.25 h)	89.7° 06:45	4.83	30%	134.3°
2043-07-12 Sun	89	—	unknown	00:40–03:55 (good, 3.25 h)	89.5° 06:40	4.87	39%	142.1°
2043-07-13 Mon	92	—	unknown	00:35–03:55 (good, 3.33 h)	89.7° 06:40	4.91	49%	147.3°
2043-07-14 Tue	94	—	unknown	00:35–04:00 (good, 3.42 h)	89.8° 06:35	4.95	58%	148.9°
2043-07-15 Wed	96	—	unknown	00:35–04:00 (good, 3.42 h)	89.8° 06:30	4.99	67%	146.5°
2043-07-16 Thu	97	—	unknown	00:30–04:00 (good, 3.5 h)	89.6° 06:25	5.04	76%	141.0°
2043-07-17 Fri	97	—	unknown	00:25–04:00 (good, 3.58 h)	89.5° 06:25	5.08	84%	133.3°
2043-07-18 Sat	99	—	unknown	00:25–04:05 (good, 3.67 h)	89.7° 06:20	5.13	90%	124.3°
2043-07-19 Sun	96	—	unknown	00:25–04:05 (good, 3.67 h)	89.8° 06:15	5.17	95%	114.6°
2043-07-20 Mon	77	—	unknown	00:30–04:05 (good, 3.58 h)	89.7° 06:10	5.22	98%	104.2°
2043-07-21 Tue	67	—	unknown	00:35–04:10 (good, 3.58 h)	89.6° 06:05	5.27	100%	93.5°
2043-07-22 Wed	56	—	unknown	01:20–04:10 (good, 2.83 h)	89.6° 06:05	5.32	99%	82.6°
2043-07-23 Thu	47	—	unknown	02:35–04:10 (good, 1.58 h)	89.8° 06:00	5.37	96%	71.5°
2043-07-24 Fri	41	—	unknown	23:25–04:15 (marginal, 4.83 h)	89.8° 05:55	5.42	92%	60.6°
2043-07-25 Sat	38	—	unknown	23:20–04:15 (marginal, 4.92 h)	89.7° 05:50	5.47	85%	50.1°
2043-07-26 Sun	39	—	unknown	23:10–04:15 (marginal, 5.08 h)	89.5° 05:45	5.52	76%	40.8°
2043-07-27 Mon	47	—	unknown	23:05–04:15 (marginal, 5.17 h)	89.7° 05:45	5.57	66%	33.8°
2043-07-28 Tue	67	—	unknown	23:35–04:20 (good, 4.75 h)	89.8° 05:40	5.62	55%	30.9°
2043-07-29 Wed	83	—	unknown	23:30–04:20 (good, 4.83 h)	89.8° 05:35	5.68	43%	33.6°
2043-07-30 Thu	87	—	unknown	23:30–04:20 (good, 4.83 h)	89.6° 05:30	5.73	32%	40.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2043-07-01&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.