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 V1057 Cyg: 03-23 (45), 03-24 (45), 03-22 (44), 03-21 (43), 03-18 (42) — by astronomy; check the weather when the night is within four days.

2048-02-24astronomy score per night — click a bar for that night2048-03-24

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2048-02-24 Mon	24	—	unknown	04:45–05:35 (good, 0.83 h)	87.2° 11:00	9.88	78%	106.4°
2048-02-25 Tue	23	—	unknown	04:55–05:30 (good, 0.58 h)	87.2° 11:00	9.84	86%	113.0°
2048-02-26 Wed	23	—	unknown	04:50–05:30 (good, 0.67 h)	87.2° 10:55	9.8	92%	118.9°
2048-02-27 Thu	22	—	unknown	04:45–05:30 (good, 0.75 h)	87.2° 10:50	9.75	97%	123.5°
2048-02-28 Fri	21	—	unknown	04:45–05:25 (good, 0.67 h)	87.2° 10:45	9.71	99%	126.5°
2048-02-29 Sat	22	—	unknown	04:40–05:25 (good, 0.75 h)	87.2° 10:40	9.66	100%	127.1°
2048-03-01 Sun	22	—	unknown	04:35–05:25 (good, 0.83 h)	87.2° 10:40	9.62	98%	125.3°
2048-03-02 Mon	22	—	unknown	04:30–05:20 (good, 0.83 h)	87.2° 10:35	9.57	93%	121.2°
2048-03-03 Tue	23	—	unknown	04:30–05:20 (good, 0.83 h)	87.2° 10:30	9.52	86%	115.2°
2048-03-04 Wed	23	—	unknown	04:30–05:20 (good, 0.83 h)	87.2° 10:25	9.48	77%	107.9°
2048-03-05 Thu	22	—	unknown	04:25–05:15 (good, 0.83 h)	87.2° 10:25	9.43	67%	99.7°
2048-03-06 Fri	23	—	unknown	04:20–05:15 (good, 0.92 h)	87.2° 10:20	9.38	56%	91.2°
2048-03-07 Sat	25	—	unknown	04:15–05:15 (good, 1.0 h)	87.2° 10:15	9.34	44%	82.7°
2048-03-08 Sun	27	—	unknown	04:05–05:10 (good, 1.08 h)	87.2° 10:10	9.29	34%	74.6°
2048-03-09 Mon	30	—	unknown	03:50–05:10 (good, 1.33 h)	87.2° 10:05	9.24	23%	67.1°
2048-03-10 Tue	33	—	unknown	03:50–05:10 (good, 1.33 h)	87.2° 10:05	9.19	15%	60.8°
2048-03-11 Wed	35	—	unknown	03:45–05:05 (good, 1.33 h)	87.2° 10:00	9.14	8%	56.1°
2048-03-12 Thu	37	—	unknown	03:40–05:05 (good, 1.42 h)	87.2° 09:55	9.09	3%	53.4°
2048-03-13 Fri	38	—	unknown	03:35–05:05 (good, 1.5 h)	87.2° 09:50	9.04	1%	52.9°
2048-03-14 Sat	38	—	unknown	03:30–05:00 (good, 1.5 h)	87.2° 09:45	8.99	0%	54.6°
2048-03-15 Sun	39	—	unknown	03:30–05:00 (good, 1.5 h)	87.2° 09:45	8.94	2%	58.3°
2048-03-16 Mon	40	—	unknown	03:25–05:00 (good, 1.58 h)	87.2° 09:40	8.89	6%	63.3°
2048-03-17 Tue	40	—	unknown	03:20–04:55 (good, 1.58 h)	87.2° 09:35	8.84	11%	69.3°
2048-03-18 Wed	42	—	unknown	03:15–04:55 (good, 1.67 h)	87.2° 09:30	8.79	18%	75.9°
2048-03-19 Thu	42	—	unknown	03:15–04:55 (good, 1.67 h)	87.2° 09:30	8.74	25%	82.9°
2048-03-20 Fri	42	—	unknown	03:10–04:50 (good, 1.67 h)	87.2° 09:25	8.69	34%	90.0°
2048-03-21 Sat	43	—	unknown	03:05–04:50 (good, 1.75 h)	87.2° 09:20	8.64	43%	97.2°
2048-03-22 Sun	44	—	unknown	03:00–04:45 (good, 1.75 h)	87.2° 09:15	8.58	52%	104.2°
2048-03-23 Mon	45	—	unknown	02:55–04:45 (good, 1.83 h)	87.2° 09:10	8.53	62%	110.8°
2048-03-24 Tue	45	—	unknown	03:00–04:45 (good, 1.75 h)	87.2° 09:10	8.48	71%	116.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2048-02-24&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.