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: 08-25 (100), 08-26 (100), 08-27 (100), 08-28 (100), 08-29 (100) — by astronomy; check the weather when the night is within four days.

2032-08-25astronomy score per night — click a bar for that night2032-09-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-09-12 Sun	94	—	unknown	21:10–02:30 (good, 5.33 h)	87.1° 20:30	8.24	52%	60.1°
2032-09-13 Mon	86	—	unknown	21:10–02:25 (good, 5.25 h)	87.1° 20:25	8.3	62%	57.4°
2032-09-14 Tue	68	—	unknown	21:10–01:55 (good, 4.75 h)	87.1° 20:20	8.35	73%	56.7°
2032-09-15 Wed	54	—	unknown	21:05–23:45 (good, 2.67 h)	87.1° 20:20	8.4	83%	58.4°
2032-09-16 Thu	49	—	unknown	21:05–21:25 (good, 0.33 h)	87.1° 20:15	8.45	91%	62.3°
2032-09-17 Fri	48	—	unknown	21:05–21:50 (good, 0.75 h)	87.1° 20:10	8.51	97%	68.0°
2032-09-18 Sat	54	—	unknown	21:00–22:55 (good, 1.92 h)	87.1° 20:05	8.56	100%	75.2°
2032-09-19 Sun	63	—	unknown	21:00–23:40 (good, 2.67 h)	87.1° 20:00	8.61	100%	83.1°
2032-09-20 Mon	75	—	unknown	20:55–00:30 (good, 3.58 h)	87.1° 20:00	8.66	97%	91.2°
2032-09-21 Tue	85	—	unknown	20:55–01:25 (good, 4.5 h)	87.1° 19:55	8.71	91%	99.2°
2032-09-22 Wed	100	—	unknown	20:55–01:30 (good, 4.58 h)	87.1° 19:50	8.76	83%	106.5°
2032-09-23 Thu	100	—	unknown	20:50–01:35 (good, 4.75 h)	87.1° 19:45	8.81	74%	112.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-08-25&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.