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 (35), 12-08 (33), 12-09 (32), 12-10 (31), 12-11 (29) — by astronomy; check the weather when the night is within four days.

2031-12-07astronomy score per night — click a bar for that night2032-01-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2031-12-07 Sun	35	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.42	42%	103.5°
2031-12-08 Mon	33	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:50	11.43	33%	97.0°
2031-12-09 Tue	32	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:45	11.44	23%	90.1°
2031-12-10 Wed	31	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:45	11.45	15%	83.0°
2031-12-11 Thu	29	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 13:40	11.46	8%	75.9°
2031-12-12 Fri	28	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:35	11.47	3%	69.2°
2031-12-13 Sat	26	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	0%	63.5°
2031-12-14 Sun	26	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:25	11.48	0%	59.4°
2031-12-15 Mon	24	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:25	11.49	4%	57.4°
2031-12-16 Tue	22	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:20	11.5	10%	57.9°
2031-12-17 Wed	19	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 13:15	11.5	18%	60.8°
2031-12-18 Thu	17	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:10	11.5	27%	65.5°
2031-12-19 Fri	14	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:10	11.51	38%	71.5°
2031-12-20 Sat	12	—	unknown	18:35–18:40 (good, 0.08 h)	87.1° 13:05	11.51	49%	78.3°
2031-12-21 Sun	10	—	unknown	18:05–19:30 (marginal, 1.42 h)	87.1° 13:00	11.51	60%	85.4°
2031-12-22 Mon	9	—	unknown	18:35–19:25 (marginal, 0.83 h)	87.1° 12:55	11.51	70%	92.6°
2031-12-23 Tue	9	—	unknown	18:40–19:25 (marginal, 0.75 h)	87.1° 12:50	11.51	79%	99.5°
2031-12-24 Wed	8	—	unknown	18:40–19:20 (marginal, 0.67 h)	87.1° 12:50	11.5	87%	105.9°
2031-12-25 Thu	8	—	unknown	18:40–19:15 (marginal, 0.58 h)	87.1° 12:45	11.5	93%	111.6°
2031-12-26 Fri	8	—	unknown	18:40–19:10 (marginal, 0.5 h)	87.1° 12:40	11.5	97%	116.3°
2031-12-27 Sat	8	—	unknown	18:40–19:05 (marginal, 0.42 h)	87.1° 12:35	11.49	99%	119.9°
2031-12-28 Sun	8	—	unknown	18:40–19:05 (marginal, 0.42 h)	87.1° 12:30	11.49	100%	122.1°
2031-12-29 Mon	8	—	unknown	18:40–19:00 (marginal, 0.33 h)	87.1° 12:30	11.48	98%	122.7°
2031-12-30 Tue	8	—	unknown	18:40–18:55 (marginal, 0.25 h)	87.1° 12:25	11.47	96%	121.7°
2031-12-31 Wed	7	—	unknown	05:50–06:10 (marginal, 0.33 h)	87.1° 12:20	11.46	91%	119.2°
2032-01-01 Thu	7	—	unknown	05:45–06:10 (marginal, 0.42 h)	87.1° 12:15	11.45	85%	115.5°
2032-01-02 Fri	7	—	unknown	05:45–06:10 (marginal, 0.42 h)	87.1° 12:15	11.44	77%	110.7°
2032-01-03 Sat	8	—	unknown	05:40–06:10 (marginal, 0.5 h)	87.1° 12:10	11.43	69%	105.2°
2032-01-04 Sun	8	—	unknown	05:35–06:10 (marginal, 0.58 h)	87.1° 12:05	11.42	60%	99.0°
2032-01-05 Mon	9	—	unknown	05:30–06:10 (marginal, 0.67 h)	87.1° 12:00	11.41	50%	92.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2031-12-07&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.