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: 09-22 (100), 09-23 (100), 09-24 (100), 09-25 (100), 09-26 (100) — by astronomy; check the weather when the night is within four days.

2032-09-19astronomy score per night — click a bar for that night2032-10-18

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-09-19 Sun	61	—	unknown	21:00–21:15 (good, 0.25 h)	87.3° 22:25	8.61	100%	58.7°
2032-09-20 Mon	68	—	unknown	20:55–22:45 (good, 1.83 h)	87.3° 22:20	8.66	97%	64.9°
2032-09-21 Tue	76	—	unknown	20:55–01:10 (good, 4.25 h)	87.3° 22:15	8.71	91%	72.3°
2032-09-22 Wed	100	—	unknown	20:55–02:25 (good, 5.5 h)	87.3° 22:10	8.76	83%	80.3°
2032-09-23 Thu	100	—	unknown	20:50–03:40 (good, 6.83 h)	87.3° 22:10	8.81	74%	88.4°
2032-09-24 Fri	100	—	unknown	20:50–04:00 (good, 7.17 h)	87.3° 22:05	8.86	65%	96.3°
2032-09-25 Sat	100	—	unknown	20:50–04:05 (good, 7.25 h)	87.3° 22:00	8.91	55%	103.7°
2032-09-26 Sun	100	—	unknown	20:45–04:05 (good, 7.33 h)	87.3° 21:55	8.96	45%	110.5°
2032-09-27 Mon	100	—	unknown	20:45–04:05 (good, 7.33 h)	87.3° 21:55	9.01	35%	116.4°
2032-09-28 Tue	100	—	unknown	20:40–04:05 (good, 7.42 h)	87.3° 21:50	9.06	26%	121.2°
2032-09-29 Wed	100	—	unknown	20:40–04:05 (good, 7.42 h)	87.3° 21:45	9.11	18%	124.7°
2032-09-30 Thu	100	—	unknown	20:40–04:00 (good, 7.33 h)	87.3° 21:40	9.16	12%	126.5°
2032-10-01 Fri	100	—	unknown	20:35–03:55 (good, 7.33 h)	87.3° 21:35	9.21	6%	126.6°
2032-10-02 Sat	100	—	unknown	20:35–03:55 (good, 7.33 h)	87.3° 21:35	9.25	2%	124.9°
2032-10-03 Sun	100	—	unknown	20:35–03:50 (good, 7.25 h)	87.3° 21:30	9.3	0%	121.5°
2032-10-04 Mon	100	—	unknown	20:30–03:45 (good, 7.25 h)	87.3° 21:25	9.35	0%	116.7°
2032-10-05 Tue	100	—	unknown	20:30–03:40 (good, 7.17 h)	87.3° 21:20	9.39	2%	110.8°
2032-10-06 Wed	100	—	unknown	20:30–03:35 (good, 7.08 h)	87.3° 21:15	9.44	5%	104.1°
2032-10-07 Thu	100	—	unknown	20:25–03:35 (good, 7.17 h)	87.3° 21:15	9.49	11%	96.8°
2032-10-08 Fri	100	—	unknown	20:25–03:30 (good, 7.08 h)	87.3° 21:10	9.53	18%	89.1°
2032-10-09 Sat	100	—	unknown	20:25–03:25 (good, 7.0 h)	87.3° 21:05	9.58	27%	81.4°
2032-10-10 Sun	100	—	unknown	20:20–03:20 (good, 7.0 h)	87.3° 21:00	9.62	37%	73.8°
2032-10-11 Mon	99	—	unknown	20:20–03:15 (good, 6.92 h)	87.3° 21:00	9.67	47%	66.7°
2032-10-12 Tue	91	—	unknown	20:20–03:15 (good, 6.92 h)	87.3° 20:55	9.71	59%	60.5°
2032-10-13 Wed	82	—	unknown	20:15–03:10 (good, 6.92 h)	87.3° 20:50	9.76	70%	55.9°
2032-10-14 Thu	61	—	unknown	23:10–23:55 (good, 0.75 h)	87.3° 20:45	9.8	80%	53.4°
2032-10-15 Fri	55	—	unknown	20:15–03:30 (marginal, 7.25 h)	87.3° 20:40	9.84	88%	53.7°
2032-10-16 Sat	50	—	unknown	20:15–03:10 (marginal, 6.92 h)	87.3° 20:40	9.89	95%	56.6°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-09-19&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.