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: 03-04 (81), 03-05 (81), 03-07 (80), 03-02 (79), 03-03 (79) — by astronomy; check the weather when the night is within four days.

2047-02-07astronomy score per night — click a bar for that night2047-03-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-02-07 Thu	47	—	unknown	04:05–05:55 (good, 1.83 h)	87.1° 09:45	10.55	91%	117.3°
2047-02-08 Fri	43	—	unknown	04:00–05:55 (good, 1.92 h)	87.1° 09:40	10.52	96%	117.8°
2047-02-09 Sat	41	—	unknown	04:00–05:50 (good, 1.83 h)	87.1° 09:40	10.48	99%	116.5°
2047-02-10 Sun	40	—	unknown	04:00–05:50 (good, 1.83 h)	87.1° 09:35	10.44	100%	113.4°
2047-02-11 Mon	38	—	unknown	04:00–05:50 (good, 1.83 h)	87.1° 09:30	10.41	98%	108.9°
2047-02-12 Tue	37	—	unknown	03:55–05:50 (good, 1.92 h)	87.1° 09:25	10.37	92%	103.2°
2047-02-13 Wed	36	—	unknown	03:55–05:45 (good, 1.83 h)	87.1° 09:25	10.33	85%	96.7°
2047-02-14 Thu	37	—	unknown	03:50–05:45 (good, 1.92 h)	87.1° 09:20	10.29	76%	90.0°
2047-02-15 Fri	39	—	unknown	03:40–05:45 (good, 2.08 h)	87.1° 09:15	10.25	65%	83.3°
2047-02-16 Sat	43	—	unknown	03:35–05:45 (good, 2.17 h)	87.1° 09:10	10.21	54%	77.1°
2047-02-17 Sun	46	—	unknown	03:25–05:40 (good, 2.25 h)	87.1° 09:05	10.17	43%	71.6°
2047-02-18 Mon	53	—	unknown	03:10–05:40 (good, 2.5 h)	87.1° 09:05	10.13	32%	67.2°
2047-02-19 Tue	58	—	unknown	03:05–05:40 (good, 2.58 h)	87.1° 09:00	10.09	22%	64.1°
2047-02-20 Wed	64	—	unknown	03:00–05:40 (good, 2.67 h)	87.1° 08:55	10.04	14%	62.4°
2047-02-21 Thu	67	—	unknown	02:55–05:35 (good, 2.67 h)	87.1° 08:50	10.0	8%	62.3°
2047-02-22 Fri	69	—	unknown	02:55–05:35 (good, 2.67 h)	87.1° 08:45	9.96	3%	63.7°
2047-02-23 Sat	71	—	unknown	02:50–05:35 (good, 2.75 h)	87.1° 08:45	9.92	1%	66.4°
2047-02-24 Sun	71	—	unknown	02:45–05:35 (good, 2.83 h)	87.1° 08:40	9.87	0%	70.1°
2047-02-25 Mon	72	—	unknown	02:40–05:30 (good, 2.83 h)	87.1° 08:35	9.83	1%	74.6°
2047-02-26 Tue	74	—	unknown	02:35–05:30 (good, 2.92 h)	87.1° 08:30	9.79	4%	79.7°
2047-02-27 Wed	75	—	unknown	02:35–05:30 (good, 2.92 h)	87.1° 08:30	9.74	9%	85.1°
2047-02-28 Thu	75	—	unknown	02:30–05:25 (good, 2.92 h)	87.1° 08:25	9.7	15%	90.6°
2047-03-01 Fri	77	—	unknown	02:25–05:25 (good, 3.0 h)	87.1° 08:20	9.65	23%	96.1°
2047-03-02 Sat	79	—	unknown	02:20–05:25 (good, 3.08 h)	87.1° 08:15	9.61	31%	101.4°
2047-03-03 Sun	79	—	unknown	02:15–05:20 (good, 3.08 h)	87.1° 08:10	9.56	40%	106.3°
2047-03-04 Mon	81	—	unknown	02:15–05:20 (good, 3.08 h)	87.1° 08:10	9.51	50%	110.7°
2047-03-05 Tue	81	—	unknown	02:15–05:20 (good, 3.08 h)	87.1° 08:05	9.47	60%	114.3°
2047-03-06 Wed	79	—	unknown	02:15–05:15 (good, 3.0 h)	87.1° 08:00	9.42	70%	116.8°
2047-03-07 Thu	80	—	unknown	02:10–05:15 (good, 3.08 h)	87.1° 07:55	9.37	79%	117.9°
2047-03-08 Fri	79	—	unknown	02:10–05:15 (good, 3.08 h)	87.1° 07:50	9.32	87%	117.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-02-07&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.