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: 11-17 (63), 11-18 (63), 11-19 (61), 11-20 (60), 11-21 (58) — by astronomy; check the weather when the night is within four days.

2044-11-17astronomy score per night — click a bar for that night2044-12-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2044-11-27 Sun	31	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:30	11.27	51%	73.0°
2044-11-28 Mon	28	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:25	11.29	61%	77.2°
2044-11-29 Tue	25	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 14:25	11.31	70%	82.0°
2044-11-30 Wed	23	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 14:20	11.32	80%	87.3°
2044-12-01 Thu	22	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 14:15	11.34	88%	92.9°
2044-12-02 Fri	23	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 14:10	11.36	94%	98.6°
2044-12-03 Sat	24	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:10	11.37	98%	104.0°
2044-12-04 Sun	26	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:05	11.39	100%	108.7°
2044-12-05 Mon	27	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 14:00	11.4	98%	112.2°
2044-12-06 Tue	28	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:55	11.42	94%	114.2°
2044-12-07 Wed	33	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:50	11.43	88%	114.5°
2044-12-08 Thu	32	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:50	11.44	79%	113.0°
2044-12-09 Fri	31	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:45	11.45	68%	110.1°
2044-12-10 Sat	29	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:40	11.46	58%	106.0°
2044-12-11 Sun	28	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:35	11.47	47%	101.2°
2044-12-12 Mon	27	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	36%	96.0°
2044-12-13 Tue	26	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	26%	90.7°
2044-12-14 Wed	25	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:25	11.49	18%	85.4°
2044-12-15 Thu	23	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 13:20	11.49	11%	80.3°
2044-12-16 Fri	23	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:15	11.5	6%	75.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-11-17&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.