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: 11-29 (36), 11-30 (31), 12-01 (27), 12-12 (27), 12-13 (26) — by astronomy; check the weather when the night is within four days.

2030-11-29astronomy score per night — click a bar for that night2030-12-28

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-11-29 Fri	36	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:25	11.3	28%	60.3°
2030-11-30 Sat	31	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:20	11.31	39%	64.0°
2030-12-01 Sun	27	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 14:15	11.33	50%	69.0°
2030-12-02 Mon	23	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:15	11.35	60%	74.8°
2030-12-03 Tue	21	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 14:10	11.36	70%	81.1°
2030-12-04 Wed	20	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 14:05	11.38	78%	87.6°
2030-12-05 Thu	20	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 14:00	11.39	86%	94.0°
2030-12-06 Fri	21	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 14:00	11.41	92%	100.2°
2030-12-07 Sat	22	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:55	11.42	96%	106.1°
2030-12-08 Sun	23	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:50	11.43	99%	111.3°
2030-12-09 Mon	24	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:45	11.44	100%	115.7°
2030-12-10 Tue	25	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:40	11.45	99%	119.1°
2030-12-11 Wed	25	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:40	11.46	96%	121.2°
2030-12-12 Thu	27	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:35	11.47	92%	121.8°
2030-12-13 Fri	26	—	unknown	18:35–19:30 (good, 0.92 h)	87.1° 13:30	11.48	86%	120.8°
2030-12-14 Sat	25	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:25	11.49	79%	118.4°
2030-12-15 Sun	24	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 13:20	11.49	70%	114.7°
2030-12-16 Mon	23	—	unknown	18:35–19:20 (good, 0.75 h)	87.1° 13:20	11.5	61%	109.8°
2030-12-17 Tue	22	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:15	11.5	51%	103.9°
2030-12-18 Wed	21	—	unknown	18:35–19:10 (good, 0.58 h)	87.1° 13:10	11.5	40%	97.3°
2030-12-19 Thu	20	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:05	11.51	30%	90.1°
2030-12-20 Fri	18	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:05	11.51	20%	82.7°
2030-12-21 Sat	16	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:00	11.51	11%	75.4°
2030-12-22 Sun	15	—	unknown	18:35–18:55 (good, 0.33 h)	87.1° 12:55	11.51	5%	68.8°
2030-12-23 Mon	13	—	unknown	18:40–18:50 (good, 0.17 h)	87.1° 12:50	11.51	1%	63.3°
2030-12-24 Tue	12	—	unknown	18:40–18:45 (good, 0.08 h)	87.1° 12:45	11.5	0%	59.6°
2030-12-25 Wed	11	—	unknown	18:05–19:15 (marginal, 1.17 h)	87.1° 12:45	11.5	2%	58.3°
2030-12-26 Thu	10	—	unknown	18:40–19:10 (marginal, 0.5 h)	87.1° 12:40	11.5	7%	59.3°
2030-12-27 Fri	9	—	unknown	18:40–19:05 (marginal, 0.42 h)	87.1° 12:35	11.49	14%	62.5°
2030-12-28 Sat	8	—	unknown	18:40–19:00 (marginal, 0.33 h)	87.1° 12:30	11.48	23%	67.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-11-29&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.