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: 02-23 (69), 02-20 (68), 02-21 (68), 02-22 (68), 02-24 (68) — by astronomy; check the weather when the night is within four days.

2029-02-04astronomy score per night — click a bar for that night2029-03-05

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2029-02-04 Sun	32	—	unknown	04:20–05:55 (good, 1.58 h)	87.1° 09:55	10.65	61%	85.8°
2029-02-05 Mon	35	—	unknown	04:15–05:55 (good, 1.67 h)	87.1° 09:50	10.61	50%	79.2°
2029-02-06 Tue	39	—	unknown	04:05–05:55 (good, 1.83 h)	87.1° 09:50	10.58	39%	73.3°
2029-02-07 Wed	43	—	unknown	03:50–05:55 (good, 2.08 h)	87.1° 09:45	10.54	28%	68.3°
2029-02-08 Thu	48	—	unknown	03:45–05:55 (good, 2.17 h)	87.1° 09:40	10.5	19%	64.5°
2029-02-09 Fri	52	—	unknown	03:40–05:50 (good, 2.17 h)	87.1° 09:35	10.47	12%	62.0°
2029-02-10 Sat	55	—	unknown	03:40–05:50 (good, 2.17 h)	87.1° 09:30	10.43	6%	61.1°
2029-02-11 Sun	57	—	unknown	03:35–05:50 (good, 2.25 h)	87.1° 09:30	10.39	2%	61.8°
2029-02-12 Mon	58	—	unknown	03:30–05:50 (good, 2.33 h)	87.1° 09:25	10.35	0%	63.9°
2029-02-13 Tue	58	—	unknown	03:25–05:45 (good, 2.33 h)	87.1° 09:20	10.31	0%	67.2°
2029-02-14 Wed	60	—	unknown	03:20–05:45 (good, 2.42 h)	87.1° 09:15	10.27	2%	71.4°
2029-02-15 Thu	61	—	unknown	03:20–05:45 (good, 2.42 h)	87.1° 09:15	10.23	6%	76.3°
2029-02-16 Fri	63	—	unknown	03:15–05:45 (good, 2.5 h)	87.1° 09:10	10.19	11%	81.6°
2029-02-17 Sat	63	—	unknown	03:10–05:40 (good, 2.5 h)	87.1° 09:05	10.15	18%	87.3°
2029-02-18 Sun	65	—	unknown	03:05–05:40 (good, 2.58 h)	87.1° 09:00	10.11	25%	93.0°
2029-02-19 Mon	66	—	unknown	03:05–05:40 (good, 2.58 h)	87.1° 08:55	10.07	34%	98.6°
2029-02-20 Tue	68	—	unknown	03:00–05:40 (good, 2.67 h)	87.1° 08:55	10.03	43%	104.0°
2029-02-21 Wed	68	—	unknown	02:55–05:35 (good, 2.67 h)	87.1° 08:50	9.99	53%	109.0°
2029-02-22 Thu	68	—	unknown	02:55–05:35 (good, 2.67 h)	87.1° 08:45	9.94	63%	113.3°
2029-02-23 Fri	69	—	unknown	02:55–05:35 (good, 2.67 h)	87.1° 08:40	9.9	73%	116.6°
2029-02-24 Sat	68	—	unknown	02:50–05:30 (good, 2.67 h)	87.1° 08:35	9.86	82%	118.6°
2029-02-25 Sun	68	—	unknown	02:50–05:30 (good, 2.67 h)	87.1° 08:35	9.81	89%	118.8°
2029-02-26 Mon	60	—	unknown	02:50–05:30 (good, 2.67 h)	87.1° 08:30	9.77	95%	117.1°
2029-02-27 Tue	57	—	unknown	02:50–05:30 (good, 2.67 h)	87.1° 08:25	9.72	99%	113.6°
2029-02-28 Wed	53	—	unknown	02:50–05:25 (good, 2.58 h)	87.1° 08:20	9.68	100%	108.4°
2029-03-01 Thu	50	—	unknown	02:50–05:25 (good, 2.58 h)	87.1° 08:20	9.63	98%	102.0°
2029-03-02 Fri	47	—	unknown	02:50–05:25 (good, 2.58 h)	87.1° 08:15	9.59	92%	95.0°
2029-03-03 Sat	46	—	unknown	02:45–05:20 (good, 2.58 h)	87.1° 08:10	9.54	85%	87.8°
2029-03-04 Sun	47	—	unknown	02:40–05:20 (good, 2.67 h)	87.1° 08:05	9.5	76%	80.9°
2029-03-05 Mon	51	—	unknown	02:30–05:20 (good, 2.83 h)	87.1° 08:00	9.45	65%	74.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-02-04&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.