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: 09-11 (100), 09-22 (100), 09-23 (100), 09-24 (100), 09-25 (100) — by astronomy; check the weather when the night is within four days.

2032-09-11astronomy score per night — click a bar for that night2032-10-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-09-24 Fri	100	—	unknown	20:50–01:35 (good, 4.75 h)	87.1° 19:45	8.86	65%	117.8°
2032-09-25 Sat	100	—	unknown	20:50–01:30 (good, 4.67 h)	87.1° 19:40	8.91	55%	121.3°
2032-09-26 Sun	100	—	unknown	20:45–01:30 (good, 4.75 h)	87.1° 19:35	8.96	45%	123.1°
2032-09-27 Mon	100	—	unknown	20:45–01:30 (good, 4.75 h)	87.1° 19:30	9.01	35%	123.2°
2032-09-28 Tue	100	—	unknown	20:40–01:25 (good, 4.75 h)	87.1° 19:25	9.06	26%	121.7°
2032-09-29 Wed	100	—	unknown	20:40–01:20 (good, 4.67 h)	87.1° 19:25	9.11	18%	118.7°
2032-09-30 Thu	100	—	unknown	20:40–01:20 (good, 4.67 h)	87.1° 19:20	9.16	12%	114.5°
2032-10-01 Fri	100	—	unknown	20:35–01:15 (good, 4.67 h)	87.1° 19:15	9.21	6%	109.4°
2032-10-02 Sat	100	—	unknown	20:35–01:10 (good, 4.58 h)	87.1° 19:10	9.25	2%	103.6°
2032-10-03 Sun	100	—	unknown	20:35–01:05 (good, 4.5 h)	87.1° 19:05	9.3	0%	97.3°
2032-10-04 Mon	100	—	unknown	20:30–01:05 (good, 4.58 h)	87.1° 19:05	9.35	0%	90.7°
2032-10-05 Tue	100	—	unknown	20:30–01:00 (good, 4.5 h)	87.1° 19:00	9.39	2%	84.0°
2032-10-06 Wed	100	—	unknown	20:30–00:55 (good, 4.42 h)	87.1° 18:55	9.44	5%	77.4°
2032-10-07 Thu	100	—	unknown	20:25–00:50 (good, 4.42 h)	87.1° 18:50	9.49	11%	71.1°
2032-10-08 Fri	100	—	unknown	20:25–00:45 (good, 4.33 h)	87.1° 18:50	9.53	18%	65.5°
2032-10-09 Sat	95	—	unknown	20:25–00:45 (good, 4.33 h)	87.1° 18:45	9.58	27%	61.0°
2032-10-10 Sun	89	—	unknown	20:20–00:40 (good, 4.33 h)	87.1° 18:40	9.62	37%	57.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-09-11&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.