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: 10-31 (71), 11-13 (67), 11-14 (67), 11-15 (67), 11-12 (66) — by astronomy; check the weather when the night is within four days.

2030-10-31astronomy score per night — click a bar for that night2030-11-29

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2030-10-31 Thu	71	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:20	10.47	32%	58.4°
2030-11-01 Fri	60	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:15	10.5	44%	58.8°
2030-11-02 Sat	50	—	unknown	18:50–21:45 (good, 2.92 h)	87.1° 16:10	10.54	55%	61.2°
2030-11-03 Sun	43	—	unknown	18:50–21:05 (good, 2.25 h)	87.1° 16:05	10.57	65%	65.2°
2030-11-04 Mon	39	—	unknown	18:50–20:10 (good, 1.33 h)	87.1° 16:05	10.61	75%	70.4°
2030-11-05 Tue	37	—	unknown	18:50–19:55 (good, 1.08 h)	87.1° 16:00	10.64	83%	76.3°
2030-11-06 Wed	38	—	unknown	18:45–19:55 (good, 1.17 h)	87.1° 15:55	10.68	90%	82.6°
2030-11-07 Thu	40	—	unknown	18:45–20:15 (good, 1.5 h)	87.1° 15:50	10.71	95%	89.1°
2030-11-08 Fri	43	—	unknown	18:45–20:40 (good, 1.92 h)	87.1° 15:50	10.74	98%	95.6°
2030-11-09 Sat	47	—	unknown	18:45–21:10 (good, 2.42 h)	87.1° 15:45	10.78	100%	101.8°
2030-11-10 Sun	52	—	unknown	18:45–21:15 (good, 2.5 h)	87.1° 15:40	10.81	99%	107.5°
2030-11-11 Mon	55	—	unknown	18:45–21:15 (good, 2.5 h)	87.1° 15:35	10.84	97%	112.5°
2030-11-12 Tue	66	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:30	10.87	93%	116.7°
2030-11-13 Wed	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:30	10.9	88%	119.7°
2030-11-14 Thu	67	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:25	10.93	81%	121.5°
2030-11-15 Fri	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:20	10.96	73%	121.7°
2030-11-16 Sat	66	—	unknown	18:40–21:15 (good, 2.58 h)	87.1° 15:15	10.99	64%	120.4°
2030-11-17 Sun	65	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.02	54%	117.6°
2030-11-18 Mon	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:10	11.04	44%	113.4°
2030-11-19 Tue	62	—	unknown	18:35–21:05 (good, 2.5 h)	87.1° 15:05	11.07	34%	108.1°
2030-11-20 Wed	60	—	unknown	18:35–21:00 (good, 2.42 h)	87.1° 15:00	11.1	24%	101.7°
2030-11-21 Thu	59	—	unknown	18:35–20:55 (good, 2.33 h)	87.1° 14:55	11.12	16%	94.6°
2030-11-22 Fri	57	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:55	11.14	8%	87.1°
2030-11-23 Sat	56	—	unknown	18:35–20:50 (good, 2.25 h)	87.1° 14:50	11.17	3%	79.5°
2030-11-24 Sun	54	—	unknown	18:35–20:45 (good, 2.17 h)	87.1° 14:45	11.19	0%	72.3°
2030-11-25 Mon	52	—	unknown	18:35–20:40 (good, 2.08 h)	87.1° 14:40	11.21	1%	66.0°
2030-11-26 Tue	51	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:35	11.24	4%	61.3°
2030-11-27 Wed	47	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:35	11.26	10%	58.7°
2030-11-28 Thu	42	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:30	11.28	18%	58.4°
2030-11-29 Fri	36	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:25	11.3	28%	60.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2030-10-31&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.