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: 10-07 (100), 10-08 (100), 10-09 (100), 10-10 (100), 10-11 (100) — by astronomy; check the weather when the night is within four days.

2045-10-07astronomy score per night — click a bar for that night2045-11-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2045-10-07 Sat	100	—	unknown	20:25–00:50 (good, 4.42 h)	87.1° 18:55	9.48	9%	107.2°
2045-10-08 Sun	100	—	unknown	20:25–00:50 (good, 4.42 h)	87.1° 18:50	9.53	3%	101.9°
2045-10-09 Mon	100	—	unknown	20:25–00:45 (good, 4.33 h)	87.1° 18:45	9.57	0%	95.9°
2045-10-10 Tue	100	—	unknown	20:20–00:40 (good, 4.33 h)	87.1° 18:40	9.62	0%	89.7°
2045-10-11 Wed	100	—	unknown	20:20–00:35 (good, 4.25 h)	87.1° 18:35	9.66	3%	83.6°
2045-10-12 Thu	100	—	unknown	20:20–00:30 (good, 4.17 h)	87.1° 18:35	9.71	8%	78.0°
2045-10-13 Fri	100	—	unknown	20:15–00:30 (good, 4.25 h)	87.1° 18:30	9.75	15%	73.1°
2045-10-14 Sat	100	—	unknown	20:15–00:25 (good, 4.17 h)	87.1° 18:25	9.79	23%	69.1°
2045-10-15 Sun	94	—	unknown	20:15–00:20 (good, 4.08 h)	87.1° 18:20	9.84	32%	66.3°
2045-10-16 Mon	83	—	unknown	20:15–00:15 (good, 4.0 h)	87.1° 18:15	9.88	42%	64.7°
2045-10-17 Tue	71	—	unknown	20:10–00:15 (good, 4.08 h)	87.1° 18:15	9.92	51%	64.4°
2045-10-18 Wed	61	—	unknown	20:10–23:45 (good, 3.58 h)	87.1° 18:10	9.97	61%	65.2°
2045-10-19 Thu	53	—	unknown	20:10–23:25 (good, 3.25 h)	87.1° 18:05	10.01	70%	67.1°
2045-10-20 Fri	49	—	unknown	20:05–22:20 (good, 2.25 h)	87.1° 18:00	10.05	78%	70.0°
2045-10-21 Sat	45	—	unknown	20:05–21:45 (good, 1.67 h)	87.1° 18:00	10.09	85%	73.8°
2045-10-22 Sun	44	—	unknown	20:05–21:30 (good, 1.42 h)	87.1° 17:55	10.13	91%	78.3°
2045-10-23 Mon	45	—	unknown	20:05–21:35 (good, 1.5 h)	87.1° 17:50	10.17	96%	83.2°
2045-10-24 Tue	48	—	unknown	20:00–21:55 (good, 1.92 h)	87.1° 17:45	10.21	99%	88.6°
2045-10-25 Wed	53	—	unknown	20:00–22:20 (good, 2.33 h)	87.1° 17:40	10.25	100%	94.1°
2045-10-26 Thu	59	—	unknown	20:00–22:55 (good, 2.92 h)	87.1° 17:40	10.29	99%	99.5°
2045-10-27 Fri	65	—	unknown	20:00–23:10 (good, 3.17 h)	87.1° 17:35	10.33	95%	104.6°
2045-10-28 Sat	72	—	unknown	19:55–23:10 (good, 3.25 h)	87.1° 17:30	10.37	90%	109.1°
2045-10-29 Sun	84	—	unknown	18:55–22:10 (good, 3.25 h)	87.1° 16:25	10.41	82%	112.6°
2045-10-30 Mon	88	—	unknown	18:55–22:15 (good, 3.33 h)	87.1° 16:20	10.44	73%	115.0°
2045-10-31 Tue	89	—	unknown	18:55–22:10 (good, 3.25 h)	87.1° 16:20	10.48	63%	115.8°
2045-11-01 Wed	89	—	unknown	18:50–22:15 (good, 3.42 h)	87.1° 16:15	10.52	52%	115.0°
2045-11-02 Thu	87	—	unknown	18:50–22:10 (good, 3.33 h)	87.1° 16:10	10.55	41%	112.6°
2045-11-03 Fri	86	—	unknown	18:50–22:05 (good, 3.25 h)	87.1° 16:05	10.59	30%	108.9°
2045-11-04 Sat	84	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:05	10.62	20%	103.9°
2045-11-05 Sun	82	—	unknown	18:50–22:00 (good, 3.17 h)	87.1° 16:00	10.66	11%	98.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-10-07&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.