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: 09-28 (100), 09-29 (100), 09-30 (100), 10-01 (100), 10-02 (100) — by astronomy; check the weather when the night is within four days.

2032-09-28astronomy score per night — click a bar for that night2032-10-27

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2032-10-11 Mon	75	—	unknown	20:20–00:35 (good, 4.25 h)	87.1° 18:35	9.67	47%	56.6°
2032-10-12 Tue	62	—	unknown	20:20–00:10 (good, 3.83 h)	87.1° 18:30	9.71	59%	57.5°
2032-10-13 Wed	52	—	unknown	20:15–23:15 (good, 3.0 h)	87.1° 18:30	9.76	70%	60.6°
2032-10-14 Thu	46	—	unknown	20:15–22:00 (good, 1.75 h)	87.1° 18:25	9.8	80%	65.5°
2032-10-15 Fri	44	—	unknown	20:15–21:35 (good, 1.33 h)	87.1° 18:20	9.84	88%	72.0°
2032-10-16 Sat	46	—	unknown	20:15–21:50 (good, 1.58 h)	87.1° 18:15	9.89	95%	79.5°
2032-10-17 Sun	52	—	unknown	20:10–22:20 (good, 2.17 h)	87.1° 18:10	9.93	99%	87.6°
2032-10-18 Mon	60	—	unknown	20:10–23:00 (good, 2.83 h)	87.1° 18:10	9.97	100%	95.6°
2032-10-19 Tue	68	—	unknown	20:10–23:35 (good, 3.42 h)	87.1° 18:05	10.01	98%	103.3°
2032-10-20 Wed	78	—	unknown	20:05–23:40 (good, 3.58 h)	87.1° 18:00	10.06	94%	110.2°
2032-10-21 Thu	92	—	unknown	20:05–23:45 (good, 3.67 h)	87.1° 17:55	10.1	88%	116.0°
2032-10-22 Fri	95	—	unknown	20:05–23:45 (good, 3.67 h)	87.1° 17:55	10.14	80%	120.2°
2032-10-23 Sat	96	—	unknown	20:05–23:40 (good, 3.58 h)	87.1° 17:50	10.18	71%	122.7°
2032-10-24 Sun	97	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:45	10.22	62%	123.4°
2032-10-25 Mon	95	—	unknown	20:00–23:40 (good, 3.67 h)	87.1° 17:40	10.26	52%	122.4°
2032-10-26 Tue	95	—	unknown	20:00–23:35 (good, 3.58 h)	87.1° 17:35	10.3	42%	119.8°
2032-10-27 Wed	93	—	unknown	20:00–23:30 (good, 3.5 h)	87.1° 17:35	10.34	33%	115.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-09-28&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.