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 Vega: 08-13 (100), 08-14 (100), 08-24 (100), 08-25 (100), 08-26 (100) — by astronomy; check the weather when the night is within four days.

2032-08-13astronomy score per night — click a bar for that night2032-09-11

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-08-13 Fri	100	—	unknown	22:10–04:25 (good, 6.25 h)	87.1° 22:30	6.56	46%	74.5°
2032-08-14 Sat	100	—	unknown	22:10–04:25 (good, 6.25 h)	87.1° 22:25	6.62	56%	68.4°
2032-08-15 Sun	98	—	unknown	22:10–04:20 (good, 6.17 h)	87.1° 22:20	6.67	67%	63.2°
2032-08-16 Mon	91	—	unknown	22:05–04:15 (good, 6.17 h)	87.1° 22:15	6.73	77%	59.2°
2032-08-17 Tue	83	—	unknown	22:05–04:10 (good, 6.08 h)	87.1° 22:10	6.79	86%	57.1°
2032-08-18 Wed	57	—	unknown	22:00–04:40 (marginal, 6.67 h)	87.1° 22:10	6.85	93%	57.3°
2032-08-19 Thu	53	—	unknown	22:00–04:25 (marginal, 6.42 h)	87.1° 22:05	6.9	98%	59.9°
2032-08-20 Fri	55	—	unknown	22:00–22:25 (good, 0.42 h)	87.1° 22:00	6.96	100%	64.7°
2032-08-21 Sat	64	—	unknown	21:55–00:10 (good, 2.25 h)	87.1° 21:55	7.02	99%	71.2°
2032-08-22 Sun	74	—	unknown	21:55–01:20 (good, 3.42 h)	87.1° 21:55	7.08	95%	78.7°
2032-08-23 Mon	81	—	unknown	21:50–02:20 (good, 4.5 h)	87.1° 21:50	7.13	88%	86.7°
2032-08-24 Tue	100	—	unknown	21:50–03:15 (good, 5.42 h)	87.1° 21:45	7.19	80%	94.6°
2032-08-25 Wed	100	—	unknown	21:50–03:20 (good, 5.5 h)	87.1° 21:40	7.25	70%	102.0°
2032-08-26 Thu	100	—	unknown	21:45–03:25 (good, 5.67 h)	87.1° 21:35	7.3	59%	108.7°
2032-08-27 Fri	100	—	unknown	21:45–03:25 (good, 5.67 h)	87.1° 21:35	7.36	49%	114.4°
2032-08-28 Sat	100	—	unknown	21:40–03:25 (good, 5.75 h)	87.1° 21:30	7.42	39%	118.8°
2032-08-29 Sun	100	—	unknown	21:40–03:20 (good, 5.67 h)	87.1° 21:25	7.47	29%	121.8°
2032-08-30 Mon	100	—	unknown	21:40–03:20 (good, 5.67 h)	87.1° 21:20	7.53	21%	123.1°
2032-08-31 Tue	100	—	unknown	21:35–03:15 (good, 5.67 h)	87.1° 21:15	7.59	14%	122.8°
2032-09-01 Wed	100	—	unknown	21:35–03:15 (good, 5.67 h)	87.1° 21:15	7.64	8%	120.9°
2032-09-02 Thu	100	—	unknown	21:30–03:10 (good, 5.67 h)	87.1° 21:10	7.7	4%	117.6°
2032-09-03 Fri	100	—	unknown	21:30–03:05 (good, 5.58 h)	87.1° 21:05	7.75	1%	113.2°
2032-09-04 Sat	100	—	unknown	21:30–03:00 (good, 5.5 h)	87.1° 21:00	7.81	0%	107.9°
2032-09-05 Sun	100	—	unknown	21:25–02:55 (good, 5.5 h)	87.1° 21:00	7.86	1%	102.0°
2032-09-06 Mon	100	—	unknown	21:25–02:55 (good, 5.5 h)	87.1° 20:55	7.92	4%	95.6°
2032-09-07 Tue	100	—	unknown	21:20–02:50 (good, 5.5 h)	87.1° 20:50	7.97	8%	89.0°
2032-09-08 Wed	100	—	unknown	21:20–02:45 (good, 5.42 h)	87.1° 20:45	8.03	14%	82.4°
2032-09-09 Thu	100	—	unknown	21:20–02:40 (good, 5.33 h)	87.1° 20:40	8.08	22%	75.9°
2032-09-10 Fri	100	—	unknown	21:15–02:35 (good, 5.33 h)	87.1° 20:40	8.14	31%	69.8°
2032-09-11 Sat	100	—	unknown	21:15–02:35 (good, 5.33 h)	87.1° 20:35	8.19	41%	64.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-13&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.