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: 11-25 (52), 11-26 (51), 11-27 (50), 11-28 (48), 11-29 (46) — by astronomy; check the weather when the night is within four days.

2046-11-25astronomy score per night — click a bar for that night2046-12-24

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-11-25 Sun	52	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.22	6%	84.6°
2046-11-26 Mon	51	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:35	11.24	2%	78.1°
2046-11-27 Tue	50	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:35	11.26	0%	72.2°
2046-11-28 Wed	48	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:30	11.28	1%	67.5°
2046-11-29 Thu	46	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:25	11.3	5%	64.2°
2046-11-30 Fri	42	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.32	11%	62.5°
2046-12-01 Sat	38	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:15	11.33	19%	62.4°
2046-12-02 Sun	33	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:15	11.35	27%	63.9°
2046-12-03 Mon	29	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 14:10	11.37	36%	66.6°
2046-12-04 Tue	25	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 14:05	11.38	46%	70.3°
2046-12-05 Wed	22	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 14:00	11.4	56%	74.7°
2046-12-06 Thu	20	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 14:00	11.41	65%	79.7°
2046-12-07 Fri	18	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:55	11.42	74%	85.0°
2046-12-08 Sat	17	—	unknown	18:35–18:55 (good, 0.33 h)	87.1° 13:50	11.43	81%	90.5°
2046-12-09 Sun	17	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:45	11.44	88%	96.0°
2046-12-10 Mon	18	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 13:40	11.45	94%	101.4°
2046-12-11 Tue	18	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:40	11.46	98%	106.5°
2046-12-12 Wed	19	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:35	11.47	100%	111.0°
2046-12-13 Thu	20	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:30	11.48	100%	114.5°
2046-12-14 Fri	20	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:25	11.49	98%	116.9°
2046-12-15 Sat	23	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:20	11.49	93%	117.8°
2046-12-16 Sun	23	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 13:20	11.5	87%	117.0°
2046-12-17 Mon	22	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:15	11.5	78%	114.7°
2046-12-18 Tue	20	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 13:10	11.5	69%	110.8°
2046-12-19 Wed	20	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:05	11.51	58%	105.8°
2046-12-20 Thu	18	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:05	11.51	46%	99.9°
2046-12-21 Fri	16	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:00	11.51	35%	93.5°
2046-12-22 Sat	15	—	unknown	18:35–18:55 (good, 0.33 h)	87.1° 12:55	11.51	25%	86.9°
2046-12-23 Sun	13	—	unknown	18:40–18:50 (good, 0.17 h)	87.1° 12:50	11.51	15%	80.4°
2046-12-24 Mon	12	—	unknown	18:40–18:45 (good, 0.08 h)	87.1° 12:45	11.5	8%	74.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-11-25&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.