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: 10-30 (91), 10-28 (90), 10-29 (90), 10-31 (89), 11-01 (89) — by astronomy; check the weather when the night is within four days.

2037-10-28astronomy score per night — click a bar for that night2037-11-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2037-10-28 Wed	90	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:30	10.37	79%	119.1°
2037-10-29 Thu	90	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:25	10.4	70%	119.1°
2037-10-30 Fri	91	—	unknown	18:55–22:15 (good, 3.33 h)	87.1° 16:20	10.44	60%	117.5°
2037-10-31 Sat	89	—	unknown	18:55–22:20 (good, 3.42 h)	87.1° 16:20	10.48	50%	114.2°
2037-11-01 Sun	89	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.51	38%	109.5°
2037-11-02 Mon	87	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.55	28%	103.6°
2037-11-03 Tue	86	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:05	10.58	18%	96.9°
2037-11-04 Wed	84	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:05	10.62	10%	89.8°
2037-11-05 Thu	82	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:00	10.65	4%	82.5°
2037-11-06 Fri	81	—	unknown	18:45–21:55 (good, 3.17 h)	87.1° 15:55	10.69	1%	75.7°
2037-11-07 Sat	79	—	unknown	18:45–21:50 (good, 3.08 h)	87.1° 15:50	10.72	0%	69.7°
2037-11-08 Sun	79	—	unknown	18:45–21:45 (good, 3.0 h)	87.1° 15:45	10.75	3%	65.0°
2037-11-09 Mon	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:45	10.79	8%	62.0°
2037-11-10 Tue	70	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.82	15%	60.8°
2037-11-11 Wed	64	—	unknown	18:40–21:35 (good, 2.92 h)	87.1° 15:35	10.85	23%	61.4°
2037-11-12 Thu	56	—	unknown	18:40–21:20 (good, 2.67 h)	87.1° 15:30	10.88	32%	63.5°
2037-11-13 Fri	50	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:25	10.91	42%	66.9°
2037-11-14 Sat	45	—	unknown	18:40–21:05 (good, 2.42 h)	87.1° 15:25	10.94	52%	71.2°
2037-11-15 Sun	41	—	unknown	18:40–20:55 (good, 2.25 h)	87.1° 15:20	10.97	61%	76.2°
2037-11-16 Mon	38	—	unknown	18:40–20:45 (good, 2.08 h)	87.1° 15:15	11.0	70%	81.6°
2037-11-17 Tue	36	—	unknown	18:40–20:35 (good, 1.92 h)	87.1° 15:10	11.02	78%	87.3°
2037-11-18 Wed	37	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 15:10	11.05	86%	93.0°
2037-11-19 Thu	37	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 15:05	11.08	92%	98.7°
2037-11-20 Fri	38	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 15:00	11.1	96%	104.2°
2037-11-21 Sat	40	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:55	11.13	99%	109.2°
2037-11-22 Sun	42	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:50	11.15	100%	113.5°
2037-11-23 Mon	44	—	unknown	18:35–20:35 (good, 2.0 h)	87.1° 14:50	11.18	99%	116.8°
2037-11-24 Tue	45	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:45	11.2	96%	118.7°
2037-11-25 Wed	50	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:40	11.22	91%	119.1°
2037-11-26 Thu	49	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:35	11.24	84%	117.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2037-10-28&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.