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: 12-07 (33), 12-08 (32), 12-09 (31), 12-10 (29), 12-11 (28) — by astronomy; check the weather when the night is within four days.

2044-12-07astronomy score per night — click a bar for that night2045-01-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2044-12-17 Sat	22	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 13:15	11.5	2%	71.9°
2044-12-18 Sun	20	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 13:10	11.51	0%	68.7°
2044-12-19 Mon	19	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:05	11.51	0%	66.6°
2044-12-20 Tue	17	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:00	11.51	2%	65.5°
2044-12-21 Wed	16	—	unknown	18:35–18:55 (good, 0.33 h)	87.1° 12:55	11.51	6%	65.4°
2044-12-22 Thu	14	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 12:55	11.51	11%	66.5°
2044-12-23 Fri	11	—	unknown	18:05–19:20 (marginal, 1.25 h)	87.1° 12:50	11.5	17%	68.7°
2044-12-24 Sat	10	—	unknown	18:40–19:15 (marginal, 0.58 h)	87.1° 12:45	11.5	25%	71.7°
2044-12-25 Sun	9	—	unknown	18:40–19:10 (marginal, 0.5 h)	87.1° 12:40	11.5	34%	75.6°
2044-12-26 Mon	8	—	unknown	18:40–19:10 (marginal, 0.5 h)	87.1° 12:35	11.49	44%	80.1°
2044-12-27 Tue	7	—	unknown	18:40–19:05 (marginal, 0.42 h)	87.1° 12:35	11.49	54%	85.1°
2044-12-28 Wed	7	—	unknown	18:40–19:00 (marginal, 0.33 h)	87.1° 12:30	11.48	64%	90.5°
2044-12-29 Thu	7	—	unknown	05:55–06:10 (marginal, 0.25 h)	87.1° 12:25	11.47	74%	96.1°
2044-12-30 Fri	8	—	unknown	05:50–06:10 (marginal, 0.33 h)	87.1° 12:20	11.47	83%	101.6°
2044-12-31 Sat	8	—	unknown	05:50–06:10 (marginal, 0.33 h)	87.1° 12:20	11.46	91%	106.6°
2045-01-01 Sun	7	—	unknown	05:45–06:10 (marginal, 0.42 h)	87.1° 12:15	11.45	96%	110.7°
2045-01-02 Mon	8	—	unknown	05:40–06:10 (marginal, 0.5 h)	87.1° 12:10	11.43	100%	113.6°
2045-01-03 Tue	8	—	unknown	05:35–06:10 (marginal, 0.58 h)	87.1° 12:05	11.42	100%	114.7°
2045-01-04 Wed	9	—	unknown	05:30–06:10 (marginal, 0.67 h)	87.1° 12:00	11.41	96%	114.0°
2045-01-05 Thu	9	—	unknown	05:30–06:10 (marginal, 0.67 h)	87.1° 11:55	11.4	91%	111.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-12-07&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.