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: 11-24 (52), 11-25 (52), 11-23 (51), 11-26 (50), 11-27 (49) — by astronomy; check the weather when the night is within four days.

2029-11-17astronomy score per night — click a bar for that night2029-12-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-11-17 Sat	31	—	unknown	18:40–19:40 (good, 1.0 h)	87.1° 15:10	11.02	91%	88.3°
2029-11-18 Sun	33	—	unknown	18:40–20:00 (good, 1.33 h)	87.1° 15:10	11.05	95%	94.3°
2029-11-19 Mon	36	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 15:05	11.08	98%	100.1°
2029-11-20 Tue	39	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 15:00	11.1	100%	105.7°
2029-11-21 Wed	42	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:55	11.13	100%	110.7°
2029-11-22 Thu	45	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:50	11.15	97%	114.9°
2029-11-23 Fri	51	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:50	11.17	93%	118.1°
2029-11-24 Sat	52	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:45	11.2	87%	120.0°
2029-11-25 Sun	52	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.22	80%	120.4°
2029-11-26 Mon	50	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:35	11.24	71%	119.1°
2029-11-27 Tue	49	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:30	11.26	61%	116.3°
2029-11-28 Wed	48	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:30	11.28	51%	112.0°
2029-11-29 Thu	46	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:25	11.3	40%	106.5°
2029-11-30 Fri	44	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.32	29%	100.0°
2029-12-01 Sat	42	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.34	19%	92.8°
2029-12-02 Sun	41	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.35	11%	85.3°
2029-12-03 Mon	40	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.37	4%	78.0°
2029-12-04 Tue	38	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:05	11.38	1%	71.3°
2029-12-05 Wed	37	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:00	11.4	0%	65.7°
2029-12-06 Thu	36	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.41	2%	61.8°
2029-12-07 Fri	33	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:55	11.42	7%	59.8°
2029-12-08 Sat	29	—	unknown	18:35–19:45 (good, 1.17 h)	87.1° 13:50	11.44	14%	59.9°
2029-12-09 Sun	26	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 13:45	11.45	23%	61.8°
2029-12-10 Mon	22	—	unknown	18:35–19:25 (good, 0.83 h)	87.1° 13:40	11.46	32%	65.3°
2029-12-11 Tue	19	—	unknown	18:35–19:15 (good, 0.67 h)	87.1° 13:35	11.47	42%	69.8°
2029-12-12 Wed	17	—	unknown	18:35–19:05 (good, 0.5 h)	87.1° 13:35	11.47	52%	75.0°
2029-12-13 Thu	15	—	unknown	18:35–19:00 (good, 0.42 h)	87.1° 13:30	11.48	61%	80.7°
2029-12-14 Fri	14	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:25	11.49	70%	86.6°
2029-12-15 Sat	13	—	unknown	18:35–18:45 (good, 0.17 h)	87.1° 13:20	11.49	79%	92.6°
2029-12-16 Sun	13	—	unknown	18:35–18:50 (good, 0.25 h)	87.1° 13:15	11.5	86%	98.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-11-17&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.