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: 10-08 (100), 10-09 (100), 10-10 (100), 10-11 (100), 10-12 (100) — by astronomy; check the weather when the night is within four days.

2036-09-27astronomy score per night — click a bar for that night2036-10-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2036-09-27 Sat	84	—	unknown	20:45–01:30 (good, 4.75 h)	87.1° 19:30	9.01	56%	58.9°
2036-09-28 Sun	69	—	unknown	20:40–01:05 (good, 4.42 h)	87.1° 19:25	9.06	66%	60.3°
2036-09-29 Mon	60	—	unknown	20:40–00:45 (good, 4.08 h)	87.1° 19:25	9.11	74%	63.0°
2036-09-30 Tue	55	—	unknown	20:40–23:30 (good, 2.83 h)	87.1° 19:20	9.16	82%	66.8°
2036-10-01 Wed	54	—	unknown	20:35–22:55 (good, 2.33 h)	87.1° 19:15	9.21	89%	71.5°
2036-10-02 Thu	54	—	unknown	20:35–22:50 (good, 2.25 h)	87.1° 19:10	9.25	94%	77.0°
2036-10-03 Fri	57	—	unknown	20:35–23:05 (good, 2.5 h)	87.1° 19:05	9.3	98%	83.0°
2036-10-04 Sat	63	—	unknown	20:30–23:25 (good, 2.92 h)	87.1° 19:05	9.35	100%	89.3°
2036-10-05 Sun	70	—	unknown	20:30–23:55 (good, 3.42 h)	87.1° 19:00	9.4	100%	95.7°
2036-10-06 Mon	77	—	unknown	20:30–00:25 (good, 3.92 h)	87.1° 18:55	9.44	98%	102.0°
2036-10-07 Tue	87	—	unknown	20:25–00:30 (good, 4.08 h)	87.1° 18:50	9.49	93%	108.0°
2036-10-08 Wed	100	—	unknown	20:25–00:30 (good, 4.08 h)	87.1° 18:50	9.53	87%	113.2°
2036-10-09 Thu	100	—	unknown	20:25–00:30 (good, 4.08 h)	87.1° 18:45	9.58	79%	117.4°
2036-10-10 Fri	100	—	unknown	20:20–00:30 (good, 4.17 h)	87.1° 18:40	9.63	70%	120.1°
2036-10-11 Sat	100	—	unknown	20:20–00:30 (good, 4.17 h)	87.1° 18:35	9.67	59%	121.1°
2036-10-12 Sun	100	—	unknown	20:20–00:30 (good, 4.17 h)	87.1° 18:30	9.71	48%	120.0°
2036-10-13 Mon	100	—	unknown	20:15–00:25 (good, 4.17 h)	87.1° 18:30	9.76	37%	117.0°
2036-10-14 Tue	100	—	unknown	20:15–00:25 (good, 4.17 h)	87.1° 18:25	9.8	26%	112.2°
2036-10-15 Wed	100	—	unknown	20:15–00:20 (good, 4.08 h)	87.1° 18:20	9.85	17%	106.2°
2036-10-16 Thu	100	—	unknown	20:10–00:15 (good, 4.08 h)	87.1° 18:15	9.89	9%	99.3°
2036-10-17 Fri	100	—	unknown	20:10–00:10 (good, 4.0 h)	87.1° 18:10	9.93	3%	91.9°
2036-10-18 Sat	100	—	unknown	20:10–00:10 (good, 4.0 h)	87.1° 18:10	9.97	1%	84.5°
2036-10-19 Sun	100	—	unknown	20:10–00:05 (good, 3.92 h)	87.1° 18:05	10.02	0%	77.5°
2036-10-20 Mon	100	—	unknown	20:05–00:00 (good, 3.92 h)	87.1° 18:00	10.06	3%	71.2°
2036-10-21 Tue	100	—	unknown	20:05–23:55 (good, 3.83 h)	87.1° 17:55	10.1	7%	66.0°
2036-10-22 Wed	97	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:55	10.14	14%	62.1°
2036-10-23 Thu	88	—	unknown	20:05–23:50 (good, 3.75 h)	87.1° 17:50	10.18	21%	59.8°
2036-10-24 Fri	80	—	unknown	20:00–23:45 (good, 3.75 h)	87.1° 17:45	10.22	30%	59.1°
2036-10-25 Sat	71	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:40	10.26	39%	59.9°
2036-10-26 Sun	62	—	unknown	19:00–22:20 (good, 3.33 h)	87.1° 16:35	10.3	49%	62.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-09-27&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.