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: 09-24 (100), 09-25 (100), 09-26 (100), 09-27 (100), 09-28 (100) — by astronomy; check the weather when the night is within four days.

2044-09-24astronomy score per night — click a bar for that night2044-10-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-09-24 Sat	100	—	unknown	21:10–05:40 (good, 8.5 h)	79.2° 02:40	8.87	13%	161.3°
2044-09-25 Sun	100	—	unknown	21:10–05:45 (good, 8.58 h)	79.2° 02:35	8.92	21%	152.2°
2044-09-26 Mon	100	—	unknown	21:05–05:45 (good, 8.67 h)	79.2° 02:30	8.97	29%	141.5°
2044-09-27 Tue	100	—	unknown	21:05–05:45 (good, 8.67 h)	79.2° 02:30	9.02	38%	130.4°
2044-09-28 Wed	100	—	unknown	21:00–05:45 (good, 8.75 h)	79.2° 02:25	9.07	48%	119.1°
2044-09-29 Thu	100	—	unknown	21:00–05:45 (good, 8.75 h)	79.2° 02:20	9.11	57%	107.8°
2044-09-30 Fri	100	—	unknown	21:05–05:50 (good, 8.75 h)	79.2° 02:15	9.16	66%	96.4°
2044-10-01 Sat	100	—	unknown	21:10–05:50 (good, 8.67 h)	79.2° 02:10	9.21	75%	84.8°
2044-10-02 Sun	100	—	unknown	22:05–05:50 (good, 7.75 h)	79.2° 02:10	9.26	83%	73.1°
2044-10-03 Mon	100	—	unknown	00:25–05:50 (good, 5.42 h)	79.2° 02:05	9.31	90%	61.2°
2044-10-04 Tue	92	—	unknown	03:55–05:55 (good, 2.0 h)	79.2° 02:00	9.35	95%	49.2°
2044-10-05 Wed	51	—	unknown	20:35–05:55 (marginal, 9.33 h)	79.2° 01:55	9.4	99%	37.2°
2044-10-06 Thu	33	—	unknown	02:50–05:55 (marginal, 3.08 h)	79.2° 01:50	9.45	100%	25.8°
2044-10-07 Fri	29	—	unknown	20:25–23:40 (marginal, 3.25 h)	79.2° 01:50	9.49	99%	16.9°
2044-10-08 Sat	34	—	unknown	20:25–00:40 (marginal, 4.25 h)	79.2° 01:45	9.54	96%	16.5°
2044-10-09 Sun	44	—	unknown	20:25–03:25 (marginal, 7.0 h)	79.2° 01:40	9.58	90%	25.3°
2044-10-10 Mon	80	—	unknown	20:20–20:40 (good, 0.33 h)	79.2° 01:35	9.63	82%	37.3°
2044-10-11 Tue	87	—	unknown	20:20–01:55 (good, 5.58 h)	79.2° 01:35	9.67	72%	50.4°
2044-10-12 Wed	95	—	unknown	20:20–05:15 (good, 8.92 h)	79.2° 01:30	9.72	61%	63.9°
2044-10-13 Thu	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.2° 01:25	9.76	50%	77.5°
2044-10-14 Fri	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.2° 01:20	9.81	39%	91.1°
2044-10-15 Sat	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.2° 01:15	9.85	28%	104.6°
2044-10-16 Sun	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.2° 01:15	9.89	18%	118.0°
2044-10-17 Mon	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.2° 01:10	9.93	11%	131.1°
2044-10-18 Tue	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.2° 01:05	9.98	5%	143.7°
2044-10-19 Wed	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.2° 01:00	10.02	1%	155.1°
2044-10-20 Thu	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.2° 00:55	10.06	0%	163.4°
2044-10-21 Fri	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.2° 00:55	10.1	1%	163.5°
2044-10-22 Sat	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.2° 00:50	10.14	4%	155.8°
2044-10-23 Sun	100	—	unknown	20:05–06:15 (good, 10.17 h)	79.2° 00:45	10.18	9%	145.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-09-24&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.