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: 05-30 (100), 05-31 (100), 06-01 (100), 06-02 (100), 06-03 (100) — by astronomy; check the weather when the night is within four days.

2032-05-22astronomy score per night — click a bar for that night2032-06-20

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-05-22 Sat	77	—	unknown	23:45–03:55 (good, 4.17 h)	87.1° 03:55	5.2	94%	81.1°
2032-05-23 Sun	67	—	unknown	00:25–03:55 (good, 3.5 h)	87.1° 03:50	5.15	98%	74.3°
2032-05-24 Mon	59	—	unknown	01:00–03:55 (good, 2.92 h)	87.1° 03:45	5.1	100%	68.0°
2032-05-25 Tue	52	—	unknown	03:35–03:50 (good, 0.25 h)	87.1° 03:40	5.06	99%	62.6°
2032-05-26 Wed	54	—	unknown	00:35–01:25 (good, 0.83 h)	87.1° 03:40	5.01	96%	58.8°
2032-05-27 Thu	84	—	unknown	22:50–03:00 (good, 4.17 h)	87.1° 03:35	4.97	90%	57.0°
2032-05-28 Fri	92	—	unknown	22:55–03:50 (good, 4.92 h)	87.1° 03:30	4.93	82%	57.5°
2032-05-29 Sat	98	—	unknown	22:55–03:50 (good, 4.92 h)	87.1° 03:25	4.89	72%	60.2°
2032-05-30 Sun	100	—	unknown	22:55–03:45 (good, 4.83 h)	87.1° 03:25	4.85	61%	64.8°
2032-05-31 Mon	100	—	unknown	22:55–03:45 (good, 4.83 h)	87.1° 03:20	4.81	49%	70.8°
2032-06-01 Tue	100	—	unknown	23:00–03:45 (good, 4.75 h)	87.1° 03:15	4.78	38%	77.7°
2032-06-02 Wed	100	—	unknown	23:00–03:45 (good, 4.75 h)	87.1° 03:10	4.74	28%	85.1°
2032-06-03 Thu	100	—	unknown	23:00–03:45 (good, 4.75 h)	87.1° 03:05	4.71	18%	92.5°
2032-06-04 Fri	100	—	unknown	23:00–03:40 (good, 4.67 h)	87.1° 03:05	4.68	11%	99.8°
2032-06-05 Sat	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.1° 03:00	4.65	5%	106.6°
2032-06-06 Sun	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.1° 02:55	4.62	1%	112.6°
2032-06-07 Mon	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.1° 02:50	4.59	0%	117.4°
2032-06-08 Tue	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.1° 02:45	4.57	1%	120.9°
2032-06-09 Wed	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.1° 02:45	4.54	4%	122.8°
2032-06-10 Thu	100	—	unknown	23:05–03:40 (good, 4.58 h)	87.1° 02:40	4.52	8%	122.9°
2032-06-11 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:35	4.5	14%	121.4°
2032-06-12 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:30	4.49	22%	118.5°
2032-06-13 Sun	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:30	4.47	30%	114.4°
2032-06-14 Mon	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:25	4.46	39%	109.3°
2032-06-15 Tue	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:20	4.45	48%	103.5°
2032-06-16 Wed	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:15	4.44	58%	97.2°
2032-06-17 Thu	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:10	4.43	67%	90.6°
2032-06-18 Fri	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:10	4.43	76%	83.7°
2032-06-19 Sat	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.1° 02:05	4.42	85%	76.8°
2032-06-20 Sun	73	—	unknown	23:15–03:40 (good, 4.42 h)	87.1° 02:00	4.42	92%	70.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-05-22&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.