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 Triangulum Pinwheel: 09-26 (100), 09-27 (100), 09-28 (100), 09-29 (100), 09-30 (100) — by astronomy; check the weather when the night is within four days.

2032-09-17astronomy score per night — click a bar for that night2032-10-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2032-09-17 Fri	70	—	unknown	03:20–05:35 (good, 2.25 h)	79.1° 03:05	8.51	97%	59.0°
2032-09-18 Sat	53	—	unknown	21:40–05:35 (marginal, 7.92 h)	79.1° 03:05	8.56	100%	45.2°
2032-09-19 Sun	31	—	unknown	21:40–05:35 (marginal, 7.92 h)	79.1° 03:00	8.61	100%	32.5°
2032-09-20 Mon	28	—	unknown	21:25–01:40 (marginal, 4.25 h)	79.1° 02:55	8.66	97%	22.6°
2032-09-21 Tue	36	—	unknown	21:10–05:40 (marginal, 8.5 h)	79.1° 02:50	8.71	91%	19.7°
2032-09-22 Wed	58	—	unknown	20:55–05:40 (marginal, 8.75 h)	79.1° 02:45	8.76	83%	25.7°
2032-09-23 Thu	82	—	unknown	23:00–00:20 (good, 1.33 h)	79.1° 02:45	8.81	74%	36.0°
2032-09-24 Fri	89	—	unknown	21:10–04:15 (good, 7.08 h)	79.1° 02:40	8.86	65%	47.3°
2032-09-25 Sat	96	—	unknown	21:10–05:45 (good, 8.58 h)	79.1° 02:35	8.91	55%	58.9°
2032-09-26 Sun	100	—	unknown	21:05–05:45 (good, 8.67 h)	79.1° 02:30	8.96	45%	70.5°
2032-09-27 Mon	100	—	unknown	21:00–05:45 (good, 8.75 h)	79.1° 02:30	9.01	35%	81.9°
2032-09-28 Tue	100	—	unknown	20:55–05:45 (good, 8.83 h)	79.1° 02:25	9.06	26%	93.2°
2032-09-29 Wed	100	—	unknown	20:50–05:45 (good, 8.92 h)	79.1° 02:20	9.11	18%	104.3°
2032-09-30 Thu	100	—	unknown	20:50–05:50 (good, 9.0 h)	79.1° 02:15	9.16	12%	115.4°
2032-10-01 Fri	100	—	unknown	20:45–05:50 (good, 9.08 h)	79.1° 02:10	9.21	6%	126.3°
2032-10-02 Sat	100	—	unknown	20:40–05:50 (good, 9.17 h)	79.1° 02:10	9.25	2%	136.9°
2032-10-03 Sun	100	—	unknown	20:35–05:50 (good, 9.25 h)	79.1° 02:05	9.3	0%	146.9°
2032-10-04 Mon	100	—	unknown	20:35–05:55 (good, 9.33 h)	79.1° 02:00	9.35	0%	155.4°
2032-10-05 Tue	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.1° 01:55	9.39	2%	160.3°
2032-10-06 Wed	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.1° 01:50	9.44	5%	158.4°
2032-10-07 Thu	100	—	unknown	20:25–05:55 (good, 9.5 h)	79.1° 01:50	9.49	11%	150.8°
2032-10-08 Fri	100	—	unknown	20:25–05:55 (good, 9.5 h)	79.1° 01:45	9.53	18%	140.6°
2032-10-09 Sat	100	—	unknown	20:25–06:00 (good, 9.58 h)	79.1° 01:40	9.58	27%	129.1°
2032-10-10 Sun	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.1° 01:35	9.62	37%	117.0°
2032-10-11 Mon	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.1° 01:30	9.67	47%	104.3°
2032-10-12 Tue	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.1° 01:30	9.71	59%	91.2°
2032-10-13 Wed	100	—	unknown	20:25–06:05 (good, 9.67 h)	79.1° 01:25	9.76	70%	77.9°
2032-10-14 Thu	100	—	unknown	22:15–06:05 (good, 7.83 h)	79.1° 01:20	9.8	80%	64.4°
2032-10-15 Fri	93	—	unknown	02:15–06:05 (good, 3.83 h)	79.1° 01:15	9.84	88%	50.9°
2032-10-16 Sat	84	—	unknown	05:45–06:05 (good, 0.33 h)	79.1° 01:15	9.89	95%	37.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2032-09-17&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.