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: 03-13 (91), 03-11 (90), 03-12 (90), 03-10 (85), 03-09 (79) — by astronomy; check the weather when the night is within four days.

2029-02-12astronomy score per night — click a bar for that night2029-03-13

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2029-03-06 Tue	56	—	unknown	02:20–05:15 (good, 2.92 h)	87.1° 08:00	9.4	54%	69.2°
2029-03-07 Wed	63	—	unknown	02:00–05:15 (good, 3.25 h)	87.1° 07:55	9.35	44%	65.0°
2029-03-08 Thu	72	—	unknown	01:55–05:15 (good, 3.33 h)	87.1° 07:50	9.31	33%	62.3°
2029-03-09 Fri	79	—	unknown	01:50–05:10 (good, 3.33 h)	87.1° 07:45	9.26	24%	61.1°
2029-03-10 Sat	85	—	unknown	01:50–05:10 (good, 3.33 h)	87.1° 07:40	9.21	16%	61.4°
2029-03-11 Sun	90	—	unknown	01:45–05:10 (good, 3.42 h)	87.1° 07:40	9.16	10%	63.2°
2029-03-12 Mon	90	—	unknown	01:40–05:05 (good, 3.42 h)	87.1° 07:35	9.11	5%	66.2°
2029-03-13 Tue	91	—	unknown	01:35–05:05 (good, 3.5 h)	87.1° 07:30	9.06	2%	70.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2029-02-12&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.