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: 08-24 (100), 08-25 (100), 08-26 (100), 08-27 (100), 08-28 (100) — by astronomy; check the weather when the night is within four days.

2032-08-23astronomy score per night — click a bar for that night2032-09-21

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-08-23 Mon	73	—	unknown	21:50–00:45 (good, 2.92 h)	87.3° 00:10	7.13	88%	61.2°
2032-08-24 Tue	100	—	unknown	21:50–03:20 (good, 5.5 h)	87.3° 00:05	7.19	80%	67.8°
2032-08-25 Wed	100	—	unknown	21:50–04:45 (good, 6.92 h)	87.3° 00:00	7.25	70%	75.3°
2032-08-26 Thu	100	—	unknown	21:45–05:05 (good, 7.33 h)	87.3° 00:00	7.3	59%	83.1°
2032-08-27 Fri	100	—	unknown	21:45–05:05 (good, 7.33 h)	87.3° 23:55	7.36	49%	90.9°
2032-08-28 Sat	100	—	unknown	21:40–05:05 (good, 7.42 h)	87.3° 23:50	7.42	39%	98.5°
2032-08-29 Sun	100	—	unknown	21:40–05:10 (good, 7.5 h)	87.3° 23:45	7.47	29%	105.6°
2032-08-30 Mon	100	—	unknown	21:40–05:10 (good, 7.5 h)	87.3° 23:45	7.53	21%	112.1°
2032-08-31 Tue	100	—	unknown	21:35–05:10 (good, 7.58 h)	87.3° 23:40	7.59	14%	117.7°
2032-09-01 Wed	100	—	unknown	21:35–05:15 (good, 7.67 h)	87.3° 23:35	7.64	8%	122.2°
2032-09-02 Thu	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.3° 23:30	7.7	4%	125.2°
2032-09-03 Fri	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.3° 23:25	7.75	1%	126.7°
2032-09-04 Sat	100	—	unknown	21:30–05:15 (good, 7.75 h)	87.3° 23:25	7.81	0%	126.3°
2032-09-05 Sun	100	—	unknown	21:25–05:20 (good, 7.92 h)	87.3° 23:20	7.86	1%	124.1°
2032-09-06 Mon	100	—	unknown	21:25–05:20 (good, 7.92 h)	87.3° 23:15	7.92	4%	120.4°
2032-09-07 Tue	100	—	unknown	21:20–05:20 (good, 8.0 h)	87.3° 23:10	7.97	8%	115.4°
2032-09-08 Wed	100	—	unknown	21:20–05:20 (good, 8.0 h)	87.3° 23:05	8.03	14%	109.3°
2032-09-09 Thu	100	—	unknown	21:20–05:25 (good, 8.08 h)	87.3° 23:05	8.08	22%	102.5°
2032-09-10 Fri	100	—	unknown	21:15–05:20 (good, 8.08 h)	87.3° 23:00	8.14	31%	95.1°
2032-09-11 Sat	100	—	unknown	21:15–05:15 (good, 8.0 h)	87.3° 22:55	8.19	41%	87.4°
2032-09-12 Sun	100	—	unknown	21:10–05:10 (good, 8.0 h)	87.3° 22:50	8.24	52%	79.6°
2032-09-13 Mon	100	—	unknown	21:10–05:05 (good, 7.92 h)	87.3° 22:50	8.3	62%	71.9°
2032-09-14 Tue	96	—	unknown	21:10–05:05 (good, 7.92 h)	87.3° 22:45	8.35	73%	64.8°
2032-09-15 Wed	87	—	unknown	21:05–05:00 (good, 7.92 h)	87.3° 22:40	8.4	83%	58.9°
2032-09-16 Thu	77	—	unknown	04:25–04:55 (good, 0.5 h)	87.3° 22:35	8.45	91%	54.8°
2032-09-17 Fri	54	—	unknown	21:05–05:20 (marginal, 8.25 h)	87.3° 22:30	8.51	97%	53.2°
2032-09-18 Sat	56	—	unknown	21:00–05:05 (marginal, 8.08 h)	87.3° 22:30	8.56	100%	54.6°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-23&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.