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: 02-08 (53), 02-09 (53), 02-07 (51), 02-05 (49), 02-06 (49) — by astronomy; check the weather when the night is within four days.

2046-01-11astronomy score per night — click a bar for that night2046-02-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-01-11 Thu	20	—	unknown	05:35–06:10 (good, 0.58 h)	87.1° 11:30	11.3	19%	73.3°
2046-01-12 Fri	21	—	unknown	05:35–06:10 (good, 0.58 h)	87.1° 11:25	11.28	27%	77.7°
2046-01-13 Sat	22	—	unknown	05:30–06:10 (good, 0.67 h)	87.1° 11:25	11.26	36%	82.6°
2046-01-14 Sun	23	—	unknown	05:25–06:10 (good, 0.75 h)	87.1° 11:20	11.24	45%	87.8°
2046-01-15 Mon	24	—	unknown	05:20–06:10 (good, 0.83 h)	87.1° 11:15	11.22	55%	93.2°
2046-01-16 Tue	25	—	unknown	05:15–06:10 (good, 0.92 h)	87.1° 11:10	11.2	65%	98.6°
2046-01-17 Wed	26	—	unknown	05:15–06:10 (good, 0.92 h)	87.1° 11:10	11.18	75%	103.8°
2046-01-18 Thu	27	—	unknown	05:10–06:10 (good, 1.0 h)	87.1° 11:05	11.15	83%	108.5°
2046-01-19 Fri	26	—	unknown	05:15–06:10 (good, 0.92 h)	87.1° 11:00	11.13	91%	112.4°
2046-01-20 Sat	24	—	unknown	05:15–06:10 (good, 0.92 h)	87.1° 10:55	11.1	96%	115.1°
2046-01-21 Sun	24	—	unknown	05:10–06:05 (good, 0.92 h)	87.1° 10:50	11.08	100%	116.1°
2046-01-22 Mon	24	—	unknown	05:10–06:05 (good, 0.92 h)	87.1° 10:50	11.05	100%	115.3°
2046-01-23 Tue	23	—	unknown	05:10–06:05 (good, 0.92 h)	87.1° 10:45	11.02	97%	112.7°
2046-01-24 Wed	23	—	unknown	05:05–06:05 (good, 1.0 h)	87.1° 10:40	11.0	92%	108.5°
2046-01-25 Thu	24	—	unknown	05:05–06:05 (good, 1.0 h)	87.1° 10:35	10.97	84%	103.2°
2046-01-26 Fri	24	—	unknown	05:00–06:05 (good, 1.08 h)	87.1° 10:30	10.94	74%	97.2°
2046-01-27 Sat	26	—	unknown	04:55–06:05 (good, 1.17 h)	87.1° 10:30	10.91	64%	91.0°
2046-01-28 Sun	28	—	unknown	04:45–06:05 (good, 1.33 h)	87.1° 10:25	10.88	53%	85.0°
2046-01-29 Mon	30	—	unknown	04:40–06:00 (good, 1.33 h)	87.1° 10:20	10.85	42%	79.3°
2046-01-30 Tue	34	—	unknown	04:30–06:00 (good, 1.5 h)	87.1° 10:15	10.82	32%	74.2°
2046-01-31 Wed	38	—	unknown	04:20–06:00 (good, 1.67 h)	87.1° 10:15	10.79	22%	70.0°
2046-02-01 Thu	41	—	unknown	04:15–06:00 (good, 1.75 h)	87.1° 10:10	10.75	15%	66.8°
2046-02-02 Fri	45	—	unknown	04:10–06:00 (good, 1.83 h)	87.1° 10:05	10.72	8%	64.7°
2046-02-03 Sat	47	—	unknown	04:05–06:00 (good, 1.92 h)	87.1° 10:00	10.69	4%	63.9°
2046-02-04 Sun	47	—	unknown	04:05–05:55 (good, 1.83 h)	87.1° 09:55	10.65	1%	64.3°
2046-02-05 Mon	49	—	unknown	04:00–05:55 (good, 1.92 h)	87.1° 09:55	10.62	0%	65.9°
2046-02-06 Tue	49	—	unknown	03:55–05:55 (good, 2.0 h)	87.1° 09:50	10.58	1%	68.6°
2046-02-07 Wed	51	—	unknown	03:50–05:55 (good, 2.08 h)	87.1° 09:45	10.54	4%	72.2°
2046-02-08 Thu	53	—	unknown	03:45–05:55 (good, 2.17 h)	87.1° 09:40	10.51	8%	76.4°
2046-02-09 Fri	53	—	unknown	03:45–05:50 (good, 2.08 h)	87.1° 09:35	10.47	14%	81.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-01-11&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.