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: 10-11 (100), 10-12 (100), 10-13 (100), 10-14 (100), 10-15 (100) — by astronomy; check the weather when the night is within four days.

2044-10-03astronomy score per night — click a bar for that night2044-11-01

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-10-03 Mon	52	—	unknown	20:35–22:45 (good, 2.17 h)	87.1° 19:05	9.31	90%	72.4°
2044-10-04 Tue	51	—	unknown	20:30–22:25 (good, 1.92 h)	87.1° 19:05	9.35	95%	76.5°
2044-10-05 Wed	52	—	unknown	20:30–22:30 (good, 2.0 h)	87.1° 19:00	9.4	99%	81.2°
2044-10-06 Thu	57	—	unknown	20:30–22:50 (good, 2.33 h)	87.1° 18:55	9.45	100%	86.5°
2044-10-07 Fri	64	—	unknown	20:25–23:20 (good, 2.92 h)	87.1° 18:50	9.49	99%	92.1°
2044-10-08 Sat	71	—	unknown	20:25–00:00 (good, 3.58 h)	87.1° 18:50	9.54	96%	97.6°
2044-10-09 Sun	80	—	unknown	20:25–00:20 (good, 3.92 h)	87.1° 18:45	9.58	90%	102.8°
2044-10-10 Mon	99	—	unknown	20:20–00:20 (good, 4.0 h)	87.1° 18:40	9.63	82%	107.4°
2044-10-11 Tue	100	—	unknown	20:20–00:25 (good, 4.08 h)	87.1° 18:35	9.67	72%	111.0°
2044-10-12 Wed	100	—	unknown	20:20–00:25 (good, 4.08 h)	87.1° 18:30	9.72	61%	113.4°
2044-10-13 Thu	100	—	unknown	20:15–00:20 (good, 4.08 h)	87.1° 18:30	9.76	50%	114.2°
2044-10-14 Fri	100	—	unknown	20:15–00:25 (good, 4.17 h)	87.1° 18:25	9.81	39%	113.5°
2044-10-15 Sat	100	—	unknown	20:15–00:20 (good, 4.08 h)	87.1° 18:20	9.85	28%	111.3°
2044-10-16 Sun	100	—	unknown	20:10–00:15 (good, 4.08 h)	87.1° 18:15	9.89	18%	107.9°
2044-10-17 Mon	100	—	unknown	20:10–00:10 (good, 4.0 h)	87.1° 18:10	9.93	11%	103.5°
2044-10-18 Tue	100	—	unknown	20:10–00:10 (good, 4.0 h)	87.1° 18:10	9.98	5%	98.4°
2044-10-19 Wed	100	—	unknown	20:10–00:05 (good, 3.92 h)	87.1° 18:05	10.02	1%	93.1°
2044-10-20 Thu	100	—	unknown	20:05–00:00 (good, 3.92 h)	87.1° 18:00	10.06	0%	87.6°
2044-10-21 Fri	100	—	unknown	20:05–23:55 (good, 3.83 h)	87.1° 17:55	10.1	1%	82.4°
2044-10-22 Sat	100	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:55	10.14	4%	77.6°
2044-10-23 Sun	98	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:50	10.18	9%	73.4°
2044-10-24 Mon	97	—	unknown	20:00–23:45 (good, 3.75 h)	87.1° 17:45	10.22	15%	70.0°
2044-10-25 Tue	89	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:40	10.26	23%	67.6°
2044-10-26 Wed	81	—	unknown	20:00–23:35 (good, 3.58 h)	87.1° 17:35	10.3	31%	66.1°
2044-10-27 Thu	72	—	unknown	19:55–23:30 (good, 3.58 h)	87.1° 17:35	10.34	40%	65.7°
2044-10-28 Fri	63	—	unknown	19:55–23:10 (good, 3.25 h)	87.1° 17:30	10.38	49%	66.4°
2044-10-29 Sat	55	—	unknown	19:55–23:00 (good, 3.08 h)	87.1° 17:25	10.41	59%	68.2°
2044-10-30 Sun	49	—	unknown	18:55–21:45 (good, 2.83 h)	87.1° 16:20	10.45	68%	71.0°
2044-10-31 Mon	44	—	unknown	18:55–20:50 (good, 1.92 h)	87.1° 16:15	10.49	77%	74.7°
2044-11-01 Tue	42	—	unknown	18:50–20:25 (good, 1.58 h)	87.1° 16:15	10.52	85%	79.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-10-03&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.