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: 10-21 (100), 10-22 (100), 10-23 (100), 10-24 (100), 10-25 (100) — by astronomy; check the weather when the night is within four days.

2032-10-17astronomy score per night — click a bar for that night2032-11-15

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-10-17 Sun	54	—	unknown	20:10–03:00 (marginal, 6.83 h)	87.3° 20:35	9.93	99%	61.9°
2032-10-18 Mon	63	—	unknown	20:10–21:25 (good, 1.25 h)	87.3° 20:30	9.97	100%	68.8°
2032-10-19 Tue	73	—	unknown	20:10–23:25 (good, 3.25 h)	87.3° 20:25	10.01	98%	76.7°
2032-10-20 Wed	80	—	unknown	20:05–00:30 (good, 4.42 h)	87.3° 20:20	10.06	94%	85.0°
2032-10-21 Thu	100	—	unknown	20:05–01:40 (good, 5.58 h)	87.3° 20:20	10.1	88%	93.2°
2032-10-22 Fri	100	—	unknown	20:05–02:10 (good, 6.08 h)	87.3° 20:15	10.14	80%	101.0°
2032-10-23 Sat	100	—	unknown	20:05–02:15 (good, 6.17 h)	87.3° 20:10	10.18	71%	108.2°
2032-10-24 Sun	100	—	unknown	20:00–02:15 (good, 6.25 h)	87.3° 20:05	10.22	62%	114.6°
2032-10-25 Mon	100	—	unknown	20:00–02:15 (good, 6.25 h)	87.3° 20:05	10.26	52%	119.8°
2032-10-26 Tue	100	—	unknown	20:00–02:15 (good, 6.25 h)	87.3° 20:00	10.3	42%	123.8°
2032-10-27 Wed	100	—	unknown	20:00–02:15 (good, 6.25 h)	87.3° 19:55	10.34	33%	126.2°
2032-10-28 Thu	100	—	unknown	19:55–02:10 (good, 6.25 h)	87.3° 19:50	10.37	24%	126.8°
2032-10-29 Fri	100	—	unknown	19:55–02:05 (good, 6.17 h)	87.3° 19:45	10.41	17%	125.6°
2032-10-30 Sat	100	—	unknown	19:55–02:05 (good, 6.17 h)	87.3° 19:45	10.45	10%	122.7°
2032-10-31 Sun	100	—	unknown	18:55–01:00 (good, 6.08 h)	87.3° 18:40	10.49	5%	118.3°
2032-11-01 Mon	100	—	unknown	18:50–00:55 (good, 6.08 h)	87.3° 18:35	10.52	2%	112.7°
2032-11-02 Tue	100	—	unknown	18:50–00:50 (good, 6.0 h)	87.3° 18:30	10.56	0%	106.1°
2032-11-03 Wed	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:25	10.59	0%	98.8°
2032-11-04 Thu	100	—	unknown	18:50–00:45 (good, 5.92 h)	87.3° 18:25	10.63	3%	91.1°
2032-11-05 Fri	100	—	unknown	18:50–00:40 (good, 5.83 h)	87.3° 18:20	10.66	8%	83.3°
2032-11-06 Sat	100	—	unknown	18:45–00:35 (good, 5.83 h)	87.3° 18:15	10.7	14%	75.5°
2032-11-07 Sun	100	—	unknown	18:45–00:30 (good, 5.75 h)	87.3° 18:10	10.73	23%	68.3°
2032-11-08 Mon	93	—	unknown	18:45–00:25 (good, 5.67 h)	87.3° 18:10	10.76	33%	61.9°
2032-11-09 Tue	85	—	unknown	18:45–00:25 (good, 5.67 h)	87.3° 18:05	10.79	44%	56.9°
2032-11-10 Wed	74	—	unknown	18:45–00:00 (good, 5.25 h)	87.3° 18:00	10.83	55%	53.9°
2032-11-11 Thu	64	—	unknown	18:40–22:55 (good, 4.25 h)	87.3° 17:55	10.86	66%	53.3°
2032-11-12 Fri	52	—	unknown	18:40–18:55 (good, 0.25 h)	87.3° 17:50	10.89	77%	55.4°
2032-11-13 Sat	47	—	unknown	18:40–00:25 (marginal, 5.75 h)	87.3° 17:50	10.92	86%	59.8°
2032-11-14 Sun	47	—	unknown	18:40–18:45 (good, 0.08 h)	87.3° 17:45	10.95	93%	66.0°
2032-11-15 Mon	52	—	unknown	18:40–19:55 (good, 1.25 h)	87.3° 17:40	10.97	98%	73.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-10-17&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.