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: 03-23 (100), 03-24 (100), 03-25 (100), 03-22 (99), 03-21 (98) — by astronomy; check the weather when the night is within four days.

2045-03-01astronomy score per night — click a bar for that night2045-03-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2045-03-01 Wed	58	—	unknown	02:45–05:25 (good, 2.67 h)	87.1° 08:20	9.63	97%	111.4°
2045-03-02 Thu	54	—	unknown	02:45–05:25 (good, 2.67 h)	87.1° 08:15	9.58	100%	107.4°
2045-03-03 Fri	51	—	unknown	02:45–05:20 (good, 2.58 h)	87.1° 08:10	9.54	99%	102.4°
2045-03-04 Sat	48	—	unknown	02:50–05:20 (good, 2.5 h)	87.1° 08:05	9.49	96%	96.8°
2045-03-05 Sun	48	—	unknown	02:50–05:20 (good, 2.5 h)	87.1° 08:00	9.44	91%	91.0°
2045-03-06 Mon	48	—	unknown	02:35–05:15 (good, 2.67 h)	87.1° 08:00	9.4	84%	85.3°
2045-03-07 Tue	50	—	unknown	02:25–05:15 (good, 2.83 h)	87.1° 07:55	9.35	75%	80.0°
2045-03-08 Wed	54	—	unknown	02:15–05:15 (good, 3.0 h)	87.1° 07:50	9.3	66%	75.3°
2045-03-09 Thu	60	—	unknown	02:10–05:10 (good, 3.0 h)	87.1° 07:45	9.25	56%	71.4°
2045-03-10 Fri	67	—	unknown	01:50–05:10 (good, 3.33 h)	87.1° 07:40	9.2	46%	68.3°
2045-03-11 Sat	76	—	unknown	01:45–05:10 (good, 3.42 h)	87.1° 07:40	9.16	37%	66.3°
2045-03-12 Sun	82	—	unknown	01:40–05:05 (good, 3.42 h)	87.1° 07:35	9.11	28%	65.4°
2045-03-13 Mon	89	—	unknown	01:35–05:05 (good, 3.5 h)	87.1° 07:30	9.06	20%	65.5°
2045-03-14 Tue	91	—	unknown	01:30–05:00 (good, 3.5 h)	87.1° 07:25	9.01	13%	66.8°
2045-03-15 Wed	93	—	unknown	01:30–05:00 (good, 3.5 h)	87.1° 07:25	8.96	7%	69.1°
2045-03-16 Thu	93	—	unknown	01:25–05:00 (good, 3.58 h)	87.1° 07:20	8.91	3%	72.4°
2045-03-17 Fri	94	—	unknown	01:20–04:55 (good, 3.58 h)	87.1° 07:15	8.86	1%	76.4°
2045-03-18 Sat	96	—	unknown	01:15–04:55 (good, 3.67 h)	87.1° 07:10	8.8	0%	81.1°
2045-03-19 Sun	97	—	unknown	01:15–04:55 (good, 3.67 h)	87.1° 07:05	8.75	2%	86.2°
2045-03-20 Mon	97	—	unknown	01:10–04:50 (good, 3.67 h)	87.1° 07:05	8.7	5%	91.6°
2045-03-21 Tue	98	—	unknown	01:05–04:50 (good, 3.75 h)	87.1° 07:00	8.65	11%	97.0°
2045-03-22 Wed	99	—	unknown	01:00–04:50 (good, 3.83 h)	87.1° 06:55	8.6	18%	102.1°
2045-03-23 Thu	100	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 06:50	8.54	27%	106.8°
2045-03-24 Fri	100	—	unknown	00:55–04:45 (good, 3.83 h)	87.1° 06:45	8.49	38%	110.6°
2045-03-25 Sat	100	—	unknown	00:55–05:40 (good, 3.75 h)	87.1° 07:45	8.44	49%	113.4°
2045-03-26 Sun	98	—	unknown	01:55–05:40 (good, 3.75 h)	87.1° 07:40	8.39	60%	114.7°
2045-03-27 Mon	97	—	unknown	01:50–05:40 (good, 3.83 h)	87.1° 07:35	8.33	71%	114.4°
2045-03-28 Tue	94	—	unknown	01:50–05:35 (good, 3.75 h)	87.1° 07:30	8.28	81%	112.5°
2045-03-29 Wed	81	—	unknown	01:55–05:35 (good, 3.67 h)	87.1° 07:30	8.22	89%	109.2°
2045-03-30 Thu	74	—	unknown	01:55–05:35 (good, 3.67 h)	87.1° 07:25	8.17	95%	104.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-03-01&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.