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: 11-09 (74), 11-10 (74), 11-11 (74), 11-08 (72), 11-12 (72) — by astronomy; check the weather when the night is within four days.

2044-10-28astronomy score per night — click a bar for that night2044-11-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2044-11-02 Wed	41	—	unknown	18:50–20:20 (good, 1.5 h)	87.1° 16:10	10.56	92%	84.3°
2044-11-03 Thu	43	—	unknown	18:50–20:30 (good, 1.67 h)	87.1° 16:05	10.6	97%	89.8°
2044-11-04 Fri	46	—	unknown	18:50–20:50 (good, 2.0 h)	87.1° 16:00	10.63	99%	95.5°
2044-11-05 Sat	52	—	unknown	18:45–21:20 (good, 2.58 h)	87.1° 16:00	10.66	100%	101.1°
2044-11-06 Sun	56	—	unknown	18:45–21:30 (good, 2.75 h)	87.1° 15:55	10.7	97%	106.1°
2044-11-07 Mon	61	—	unknown	18:45–21:30 (good, 2.75 h)	87.1° 15:50	10.73	92%	110.2°
2044-11-08 Tue	72	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:45	10.76	84%	113.1°
2044-11-09 Wed	74	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:40	10.8	75%	114.3°
2044-11-10 Thu	74	—	unknown	18:45–21:35 (good, 2.83 h)	87.1° 15:40	10.83	65%	114.0°
2044-11-11 Fri	74	—	unknown	18:40–21:35 (good, 2.92 h)	87.1° 15:35	10.86	53%	112.1°
2044-11-12 Sat	72	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.89	42%	108.9°
2044-11-13 Sun	70	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.92	32%	104.8°
2044-11-14 Mon	69	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.95	22%	99.9°
2044-11-15 Tue	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.98	14%	94.7°
2044-11-16 Wed	65	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	11.01	8%	89.3°
2044-11-17 Thu	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.03	3%	84.0°
2044-11-18 Fri	63	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.06	1%	79.1°
2044-11-19 Sat	61	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:05	11.09	0%	74.6°
2044-11-20 Sun	60	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.11	2%	70.9°
2044-11-21 Mon	58	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.14	5%	68.1°
2044-11-22 Tue	56	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:50	11.16	10%	66.2°
2044-11-23 Wed	51	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:45	11.18	16%	65.5°
2044-11-24 Thu	46	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:45	11.2	24%	65.8°
2044-11-25 Fri	40	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:40	11.23	32%	67.2°
2044-11-26 Sat	35	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:35	11.25	41%	69.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-10-28&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.