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: 10-11 (100), 10-12 (100), 10-13 (100), 10-14 (100), 10-15 (100) — by astronomy; check the weather when the night is within four days.

2036-10-11astronomy score per night — click a bar for that night2036-11-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2036-10-27 Mon	56	—	unknown	18:55–22:10 (good, 3.25 h)	87.1° 16:35	10.34	58%	65.7°
2036-10-28 Tue	51	—	unknown	18:55–22:00 (good, 3.08 h)	87.1° 16:30	10.37	67%	70.1°
2036-10-29 Wed	47	—	unknown	18:55–21:20 (good, 2.42 h)	87.1° 16:25	10.41	76%	75.3°
2036-10-30 Thu	46	—	unknown	18:55–21:00 (good, 2.08 h)	87.1° 16:20	10.45	83%	81.1°
2036-10-31 Fri	47	—	unknown	18:55–21:00 (good, 2.08 h)	87.1° 16:15	10.49	90%	87.3°
2036-11-01 Sat	50	—	unknown	18:50–21:10 (good, 2.33 h)	87.1° 16:15	10.52	95%	93.7°
2036-11-02 Sun	53	—	unknown	18:50–21:30 (good, 2.67 h)	87.1° 16:10	10.56	98%	100.1°
2036-11-03 Mon	57	—	unknown	18:50–21:40 (good, 2.83 h)	87.1° 16:05	10.59	100%	106.2°
2036-11-04 Tue	62	—	unknown	18:50–21:40 (good, 2.83 h)	87.1° 16:00	10.63	99%	111.7°
2036-11-05 Wed	68	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 16:00	10.66	96%	116.3°
2036-11-06 Thu	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:55	10.7	90%	119.4°
2036-11-07 Fri	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:50	10.73	83%	120.8°
2036-11-08 Sat	77	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:45	10.76	73%	120.1°
2036-11-09 Sun	76	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.79	63%	117.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2036-10-11&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.