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: 01-24 (100), 01-25 (100), 01-26 (100), 01-27 (100), 01-28 (99) — by astronomy; check the weather when the night is within four days.

2046-01-11astronomy score per night — click a bar for that night2046-02-09

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-01-11 Thu	95	—	unknown	18:50–00:05 (good, 5.25 h)	79.2° 18:30	11.3	19%	50.9°
2046-01-12 Fri	88	—	unknown	18:55–00:00 (good, 5.08 h)	79.2° 18:30	11.28	27%	39.9°
2046-01-13 Sat	79	—	unknown	18:55–23:55 (good, 5.0 h)	79.2° 18:25	11.26	36%	29.2°
2046-01-14 Sun	65	—	unknown	18:55–23:30 (good, 4.58 h)	79.2° 18:20	11.24	45%	19.7°
2046-01-15 Mon	49	—	unknown	20:20–21:00 (good, 0.67 h)	79.2° 18:15	11.22	55%	14.3°
2046-01-16 Tue	34	—	unknown	18:55–00:00 (marginal, 5.08 h)	79.2° 18:10	11.2	65%	17.9°
2046-01-17 Wed	23	—	unknown	19:00–23:40 (marginal, 4.67 h)	79.2° 18:10	11.18	75%	27.6°
2046-01-18 Thu	21	—	unknown	19:00–23:25 (marginal, 4.42 h)	79.2° 18:05	11.15	83%	39.6°
2046-01-19 Fri	25	—	unknown	19:00–23:20 (marginal, 4.33 h)	79.2° 18:00	11.13	91%	52.6°
2046-01-20 Sat	34	—	unknown	19:00–23:25 (marginal, 4.42 h)	79.2° 17:55	11.1	96%	66.3°
2046-01-21 Sun	48	—	unknown	19:00–20:45 (good, 1.75 h)	79.2° 17:55	11.08	100%	80.5°
2046-01-22 Mon	65	—	unknown	19:05–22:10 (good, 3.08 h)	79.2° 17:50	11.05	100%	95.0°
2046-01-23 Tue	83	—	unknown	19:05–23:00 (good, 3.92 h)	79.2° 17:45	11.02	97%	109.6°
2046-01-24 Wed	100	—	unknown	19:05–23:05 (good, 4.0 h)	79.2° 17:40	11.0	92%	124.0°
2046-01-25 Thu	100	—	unknown	19:05–23:00 (good, 3.92 h)	79.2° 17:35	10.97	84%	138.1°
2046-01-26 Fri	100	—	unknown	19:10–23:00 (good, 3.83 h)	79.2° 17:35	10.94	74%	151.2°
2046-01-27 Sat	100	—	unknown	19:10–23:00 (good, 3.83 h)	79.2° 17:30	10.91	64%	162.1°
2046-01-28 Sun	99	—	unknown	19:10–23:00 (good, 3.83 h)	79.2° 17:25	10.88	53%	165.6°
2046-01-29 Mon	98	—	unknown	19:10–22:55 (good, 3.75 h)	79.2° 17:20	10.85	42%	158.6°
2046-01-30 Tue	96	—	unknown	19:10–22:50 (good, 3.67 h)	79.2° 17:15	10.82	32%	147.7°
2046-01-31 Wed	93	—	unknown	19:15–22:45 (good, 3.5 h)	79.2° 17:15	10.79	22%	136.0°
2046-02-01 Thu	91	—	unknown	19:15–22:40 (good, 3.42 h)	79.2° 17:10	10.75	15%	124.0°
2046-02-02 Fri	88	—	unknown	19:15–22:40 (good, 3.42 h)	79.2° 17:05	10.72	8%	112.1°
2046-02-03 Sat	87	—	unknown	19:15–22:35 (good, 3.33 h)	79.2° 17:00	10.69	4%	100.3°
2046-02-04 Sun	84	—	unknown	19:20–22:30 (good, 3.17 h)	79.2° 17:00	10.65	1%	88.5°
2046-02-05 Mon	82	—	unknown	19:20–22:25 (good, 3.08 h)	79.2° 16:55	10.62	0%	76.9°
2046-02-06 Tue	80	—	unknown	19:20–22:20 (good, 3.0 h)	79.2° 16:50	10.58	1%	65.4°
2046-02-07 Wed	77	—	unknown	19:20–22:20 (good, 3.0 h)	79.2° 16:45	10.54	4%	54.1°
2046-02-08 Thu	72	—	unknown	19:20–22:15 (good, 2.92 h)	79.2° 16:40	10.51	8%	42.9°
2046-02-09 Fri	63	—	unknown	19:25–22:10 (good, 2.75 h)	79.2° 16:40	10.47	14%	32.1°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-01-11&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.