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: 01-12 (21), 12-18 (20), 01-11 (20), 12-19 (19), 01-13 (19) — by astronomy; check the weather when the night is within four days.

2032-12-15astronomy score per night — click a bar for that night2033-01-13

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-12-15 Wed	18	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:20	11.49	99%	117.0°
2032-12-16 Thu	18	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:15	11.5	100%	120.8°
2032-12-17 Fri	18	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:15	11.5	99%	122.9°
2032-12-18 Sat	20	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:10	11.5	95%	123.1°
2032-12-19 Sun	19	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:05	11.51	90%	121.5°
2032-12-20 Mon	17	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:00	11.51	84%	118.4°
2032-12-21 Tue	16	—	unknown	18:35–18:55 (good, 0.33 h)	87.1° 12:55	11.51	76%	114.2°
2032-12-22 Wed	14	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 12:55	11.51	68%	109.0°
2032-12-23 Thu	12	—	unknown	18:40–18:50 (good, 0.17 h)	87.1° 12:50	11.5	59%	103.2°
2032-12-24 Fri	11	—	unknown	18:40–18:45 (good, 0.08 h)	87.1° 12:45	11.5	49%	96.9°
2032-12-25 Sat	11	—	unknown	18:05–19:10 (marginal, 1.08 h)	87.1° 12:40	11.5	40%	90.4°
2032-12-26 Sun	10	—	unknown	18:40–19:10 (marginal, 0.5 h)	87.1° 12:35	11.49	31%	83.8°
2032-12-27 Mon	9	—	unknown	18:40–19:05 (marginal, 0.42 h)	87.1° 12:35	11.49	22%	77.2°
2032-12-28 Tue	9	—	unknown	18:40–19:00 (marginal, 0.33 h)	87.1° 12:30	11.48	14%	70.9°
2032-12-29 Wed	8	—	unknown	18:40–18:55 (marginal, 0.25 h)	87.1° 12:25	11.47	8%	65.3°
2032-12-30 Thu	9	—	unknown	05:50–06:10 (marginal, 0.33 h)	87.1° 12:20	11.47	3%	60.7°
2032-12-31 Fri	9	—	unknown	05:50–06:10 (marginal, 0.33 h)	87.1° 12:15	11.46	0%	57.7°
2033-01-01 Sat	9	—	unknown	05:45–06:10 (marginal, 0.42 h)	87.1° 12:15	11.45	0%	56.8°
2033-01-02 Sun	10	—	unknown	05:40–06:45 (marginal, 1.08 h)	87.1° 12:10	11.44	3%	58.3°
2033-01-03 Mon	11	—	unknown	05:35–06:45 (marginal, 1.17 h)	87.1° 12:05	11.42	9%	61.9°
2033-01-04 Tue	12	—	unknown	06:05–06:10 (good, 0.08 h)	87.1° 12:00	11.41	16%	67.3°
2033-01-05 Wed	12	—	unknown	06:00–06:10 (good, 0.17 h)	87.1° 11:55	11.4	26%	74.0°
2033-01-06 Thu	13	—	unknown	05:55–06:10 (good, 0.25 h)	87.1° 11:50	11.38	36%	81.4°
2033-01-07 Fri	14	—	unknown	05:50–06:10 (good, 0.33 h)	87.1° 11:45	11.37	48%	89.0°
2033-01-08 Sat	16	—	unknown	05:50–06:10 (good, 0.33 h)	87.1° 11:40	11.35	59%	96.6°
2033-01-09 Sun	17	—	unknown	05:45–06:10 (good, 0.42 h)	87.1° 11:40	11.34	69%	103.8°
2033-01-10 Mon	18	—	unknown	05:40–06:10 (good, 0.5 h)	87.1° 11:35	11.32	79%	110.3°
2033-01-11 Tue	20	—	unknown	05:35–06:10 (good, 0.58 h)	87.1° 11:30	11.3	87%	115.8°
2033-01-12 Wed	21	—	unknown	05:40–06:10 (good, 0.5 h)	87.1° 11:25	11.28	93%	119.9°
2033-01-13 Thu	19	—	unknown	05:35–06:10 (good, 0.58 h)	87.1° 11:20	11.26	97%	122.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-12-15&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.