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.

2037-10-14astronomy score per night — click a bar for that night2037-11-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2037-10-14 Wed	85	—	unknown	20:15–00:25 (good, 4.17 h)	87.1° 18:25	9.79	39%	60.6°
2037-10-15 Thu	73	—	unknown	20:15–00:20 (good, 4.08 h)	87.1° 18:20	9.84	49%	61.7°
2037-10-16 Fri	63	—	unknown	20:15–23:55 (good, 3.67 h)	87.1° 18:15	9.88	59%	64.2°
2037-10-17 Sat	57	—	unknown	20:10–23:45 (good, 3.58 h)	87.1° 18:15	9.92	68%	67.9°
2037-10-18 Sun	53	—	unknown	20:10–23:05 (good, 2.92 h)	87.1° 18:10	9.96	77%	72.4°
2037-10-19 Mon	51	—	unknown	20:10–22:35 (good, 2.42 h)	87.1° 18:05	10.01	84%	77.5°
2037-10-20 Tue	52	—	unknown	20:05–22:25 (good, 2.33 h)	87.1° 18:00	10.05	90%	83.0°
2037-10-21 Wed	54	—	unknown	20:05–22:35 (good, 2.5 h)	87.1° 18:00	10.09	95%	88.8°
2037-10-22 Thu	57	—	unknown	20:05–22:50 (good, 2.75 h)	87.1° 17:55	10.13	98%	94.6°
2037-10-23 Fri	61	—	unknown	20:05–23:10 (good, 3.08 h)	87.1° 17:50	10.17	100%	100.3°
2037-10-24 Sat	67	—	unknown	20:00–23:20 (good, 3.33 h)	87.1° 17:45	10.21	99%	105.7°
2037-10-25 Sun	72	—	unknown	19:00–22:20 (good, 3.33 h)	87.1° 16:40	10.25	97%	110.5°
2037-10-26 Mon	85	—	unknown	19:00–22:20 (good, 3.33 h)	87.1° 16:40	10.29	93%	114.5°
2037-10-27 Tue	87	—	unknown	19:00–22:20 (good, 3.33 h)	87.1° 16:35	10.33	87%	117.5°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2037-10-14&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.