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 Vega: 07-26 (100), 07-27 (100), 07-28 (100), 07-29 (100), 07-30 (100) — by astronomy; check the weather when the night is within four days.

2032-07-21astronomy score per night — click a bar for that night2032-08-19

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-07-21 Wed	51	—	unknown	22:50–04:10 (marginal, 5.33 h)	87.1° 00:00	5.3	99%	57.0°
2032-07-22 Thu	51	—	unknown	22:50–04:10 (marginal, 5.33 h)	87.1° 23:55	5.35	100%	58.2°
2032-07-23 Fri	57	—	unknown	22:50–23:50 (good, 1.0 h)	87.1° 23:50	5.4	98%	61.8°
2032-07-24 Sat	70	—	unknown	22:45–02:00 (good, 3.25 h)	87.1° 23:45	5.45	93%	67.3°
2032-07-25 Sun	78	—	unknown	22:45–03:20 (good, 4.58 h)	87.1° 23:45	5.5	86%	74.1°
2032-07-26 Mon	100	—	unknown	22:45–04:15 (good, 5.5 h)	87.1° 23:40	5.55	76%	81.6°
2032-07-27 Tue	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:35	5.61	66%	89.3°
2032-07-28 Wed	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:30	5.66	55%	96.9°
2032-07-29 Thu	100	—	unknown	22:40–04:20 (good, 5.67 h)	87.1° 23:25	5.71	44%	103.9°
2032-07-30 Fri	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:25	5.77	34%	110.2°
2032-07-31 Sat	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:20	5.82	25%	115.4°
2032-08-01 Sun	100	—	unknown	22:35–04:25 (good, 5.83 h)	87.1° 23:15	5.88	16%	119.5°
2032-08-02 Mon	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:10	5.93	10%	122.1°
2032-08-03 Tue	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:05	5.99	5%	123.0°
2032-08-04 Wed	100	—	unknown	22:30–04:30 (good, 6.0 h)	87.1° 23:05	6.05	2%	122.3°
2032-08-05 Thu	100	—	unknown	22:25–04:35 (good, 6.17 h)	87.1° 23:00	6.1	0%	120.1°
2032-08-06 Fri	100	—	unknown	22:25–04:35 (good, 6.17 h)	87.1° 22:55	6.16	1%	116.6°
2032-08-07 Sat	100	—	unknown	22:25–04:35 (good, 6.17 h)	87.1° 22:50	6.22	3%	111.9°
2032-08-08 Sun	100	—	unknown	22:20–04:35 (good, 6.25 h)	87.1° 22:50	6.27	7%	106.5°
2032-08-09 Mon	100	—	unknown	22:20–04:40 (good, 6.33 h)	87.1° 22:45	6.33	12%	100.5°
2032-08-10 Tue	100	—	unknown	22:15–04:40 (good, 6.42 h)	87.1° 22:40	6.39	19%	94.1°
2032-08-11 Wed	100	—	unknown	22:15–04:35 (good, 6.33 h)	87.1° 22:35	6.44	27%	87.5°
2032-08-12 Thu	100	—	unknown	22:15–04:30 (good, 6.25 h)	87.1° 22:30	6.5	36%	80.9°
2032-08-13 Fri	100	—	unknown	22:10–04:25 (good, 6.25 h)	87.1° 22:30	6.56	46%	74.5°
2032-08-14 Sat	100	—	unknown	22:10–04:25 (good, 6.25 h)	87.1° 22:25	6.62	56%	68.4°
2032-08-15 Sun	98	—	unknown	22:10–04:20 (good, 6.17 h)	87.1° 22:20	6.67	67%	63.2°
2032-08-16 Mon	91	—	unknown	22:05–04:15 (good, 6.17 h)	87.1° 22:15	6.73	77%	59.2°
2032-08-17 Tue	83	—	unknown	22:05–04:10 (good, 6.08 h)	87.1° 22:10	6.79	86%	57.1°
2032-08-18 Wed	57	—	unknown	22:00–04:40 (marginal, 6.67 h)	87.1° 22:10	6.85	93%	57.3°
2032-08-19 Thu	53	—	unknown	22:00–04:25 (marginal, 6.42 h)	87.1° 22:05	6.9	98%	59.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-07-21&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.