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: 03-12 (36), 03-10 (35), 03-11 (35), 03-09 (34), 03-08 (33) — by astronomy; check the weather when the night is within four days.

2032-02-12astronomy score per night — click a bar for that night2032-03-12

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-02-12 Thu	13	—	unknown	05:35–05:50 (good, 0.25 h)	87.3° 11:50	10.38	4%	53.7°
2032-02-13 Fri	14	—	unknown	05:30–05:50 (good, 0.33 h)	87.3° 11:45	10.34	10%	57.1°
2032-02-14 Sat	14	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:40	10.3	18%	62.5°
2032-02-15 Sun	14	—	unknown	05:25–05:45 (good, 0.33 h)	87.3° 11:35	10.26	28%	69.2°
2032-02-16 Mon	16	—	unknown	05:20–05:45 (good, 0.42 h)	87.3° 11:35	10.22	38%	76.5°
2032-02-17 Tue	17	—	unknown	05:15–05:45 (good, 0.5 h)	87.3° 11:30	10.18	48%	84.1°
2032-02-18 Wed	18	—	unknown	05:10–05:40 (good, 0.5 h)	87.3° 11:25	10.14	58%	91.6°
2032-02-19 Thu	19	—	unknown	05:05–05:40 (good, 0.58 h)	87.3° 11:20	10.1	67%	98.9°
2032-02-20 Fri	20	—	unknown	05:05–05:40 (good, 0.58 h)	87.3° 11:20	10.06	76%	105.9°
2032-02-21 Sat	20	—	unknown	05:00–05:35 (good, 0.58 h)	87.3° 11:15	10.02	84%	112.3°
2032-02-22 Sun	21	—	unknown	05:05–05:35 (good, 0.5 h)	87.3° 11:10	9.98	90%	117.9°
2032-02-23 Mon	19	—	unknown	05:00–05:35 (good, 0.58 h)	87.3° 11:05	9.93	95%	122.4°
2032-02-24 Tue	20	—	unknown	05:00–05:35 (good, 0.58 h)	87.3° 11:00	9.89	98%	125.5°
2032-02-25 Wed	19	—	unknown	04:55–05:30 (good, 0.58 h)	87.3° 11:00	9.85	100%	127.0°
2032-02-26 Thu	19	—	unknown	04:50–05:30 (good, 0.67 h)	87.3° 10:55	9.8	100%	126.6°
2032-02-27 Fri	20	—	unknown	04:50–05:30 (good, 0.67 h)	87.3° 10:50	9.76	98%	124.4°
2032-02-28 Sat	21	—	unknown	04:45–05:25 (good, 0.67 h)	87.3° 10:45	9.71	94%	120.5°
2032-02-29 Sun	21	—	unknown	04:45–05:25 (good, 0.67 h)	87.3° 10:40	9.67	88%	115.2°
2032-03-01 Mon	20	—	unknown	04:40–05:25 (good, 0.75 h)	87.3° 10:40	9.62	81%	108.8°
2032-03-02 Tue	20	—	unknown	04:40–05:20 (good, 0.67 h)	87.3° 10:35	9.58	72%	101.6°
2032-03-03 Wed	21	—	unknown	04:35–05:20 (good, 0.75 h)	87.3° 10:30	9.53	62%	93.8°
2032-03-04 Thu	22	—	unknown	04:30–05:20 (good, 0.83 h)	87.3° 10:25	9.48	52%	85.7°
2032-03-05 Fri	24	—	unknown	04:20–05:20 (good, 1.0 h)	87.3° 10:25	9.44	40%	77.6°
2032-03-06 Sat	26	—	unknown	04:15–05:15 (good, 1.0 h)	87.3° 10:20	9.39	30%	69.7°
2032-03-07 Sun	29	—	unknown	04:00–05:15 (good, 1.25 h)	87.3° 10:15	9.34	20%	62.7°
2032-03-08 Mon	33	—	unknown	03:55–05:15 (good, 1.33 h)	87.3° 10:10	9.29	11%	57.1°
2032-03-09 Tue	34	—	unknown	03:50–05:10 (good, 1.33 h)	87.3° 10:05	9.25	5%	53.6°
2032-03-10 Wed	35	—	unknown	03:50–05:10 (good, 1.33 h)	87.3° 10:05	9.2	1%	53.0°
2032-03-11 Thu	35	—	unknown	03:45–05:05 (good, 1.33 h)	87.3° 10:00	9.15	0%	55.3°
2032-03-12 Fri	36	—	unknown	03:40–05:05 (good, 1.42 h)	87.3° 09:55	9.1	2%	60.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-02-12&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.