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: 11-09 (77), 11-10 (75), 11-11 (74), 11-12 (67), 11-13 (61) — by astronomy; check the weather when the night is within four days.

2045-11-09astronomy score per night — click a bar for that night2045-12-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2045-11-09 Thu	77	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:45	10.79	1%	74.9°
2045-11-10 Fri	75	—	unknown	18:45–21:40 (good, 2.92 h)	87.1° 15:40	10.82	5%	70.4°
2045-11-11 Sat	74	—	unknown	18:40–21:35 (good, 2.92 h)	87.1° 15:35	10.85	10%	67.1°
2045-11-12 Sun	67	—	unknown	18:40–21:30 (good, 2.83 h)	87.1° 15:30	10.88	17%	65.0°
2045-11-13 Mon	61	—	unknown	18:40–21:25 (good, 2.75 h)	87.1° 15:25	10.91	25%	64.1°
2045-11-14 Tue	53	—	unknown	18:40–21:10 (good, 2.5 h)	87.1° 15:25	10.94	34%	64.5°
2045-11-15 Wed	47	—	unknown	18:40–21:00 (good, 2.33 h)	87.1° 15:20	10.97	43%	66.1°
2045-11-16 Thu	41	—	unknown	18:40–20:50 (good, 2.17 h)	87.1° 15:15	11.0	53%	68.7°
2045-11-17 Fri	36	—	unknown	18:40–20:40 (good, 2.0 h)	87.1° 15:10	11.03	62%	72.2°
2045-11-18 Sat	33	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 15:10	11.05	71%	76.5°
2045-11-19 Sun	31	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 15:05	11.08	79%	81.3°
2045-11-20 Mon	30	—	unknown	18:35–19:35 (good, 1.0 h)	87.1° 15:00	11.1	86%	86.6°
2045-11-21 Tue	30	—	unknown	18:35–19:40 (good, 1.08 h)	87.1° 14:55	11.13	93%	92.1°
2045-11-22 Wed	32	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:50	11.15	97%	97.6°
2045-11-23 Thu	34	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:50	11.18	99%	103.0°
2045-11-24 Fri	37	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:45	11.2	100%	107.8°
2045-11-25 Sat	39	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:40	11.22	97%	111.9°
2045-11-26 Sun	41	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:35	11.24	93%	114.7°
2045-11-27 Mon	48	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:30	11.26	86%	115.9°
2045-11-28 Tue	48	—	unknown	18:35–20:30 (good, 1.92 h)	87.1° 14:30	11.28	77%	115.6°
2045-11-29 Wed	46	—	unknown	18:35–20:25 (good, 1.83 h)	87.1° 14:25	11.3	67%	113.5°
2045-11-30 Thu	44	—	unknown	18:35–20:20 (good, 1.75 h)	87.1° 14:20	11.32	56%	110.0°
2045-12-01 Fri	43	—	unknown	18:35–20:15 (good, 1.67 h)	87.1° 14:15	11.34	44%	105.4°
2045-12-02 Sat	41	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:15	11.35	33%	100.0°
2045-12-03 Sun	40	—	unknown	18:35–20:10 (good, 1.58 h)	87.1° 14:10	11.37	23%	94.0°
2045-12-04 Mon	38	—	unknown	18:35–20:05 (good, 1.5 h)	87.1° 14:05	11.39	14%	88.0°
2045-12-05 Tue	37	—	unknown	18:35–20:00 (good, 1.42 h)	87.1° 14:00	11.4	8%	82.1°
2045-12-06 Wed	36	—	unknown	18:35–19:55 (good, 1.33 h)	87.1° 13:55	11.41	3%	76.6°
2045-12-07 Thu	34	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:55	11.43	0%	71.9°
2045-12-08 Fri	33	—	unknown	18:35–19:50 (good, 1.25 h)	87.1° 13:50	11.44	0%	68.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-11-09&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.