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: 10-05 (100), 10-06 (100), 10-07 (100), 10-08 (100), 10-09 (100) — by astronomy; check the weather when the night is within four days.

2046-10-05astronomy score per night — click a bar for that night2046-11-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2046-10-05 Fri	100	—	unknown	20:35–05:55 (good, 9.33 h)	79.2° 02:00	9.38	40%	120.6°
2046-10-06 Sat	100	—	unknown	20:35–05:55 (good, 9.33 h)	79.2° 01:55	9.42	51%	108.1°
2046-10-07 Sun	100	—	unknown	20:35–05:55 (good, 9.33 h)	79.2° 01:50	9.47	61%	95.9°
2046-10-08 Mon	100	—	unknown	20:45–05:55 (good, 9.17 h)	79.2° 01:45	9.52	70%	83.9°
2046-10-09 Tue	100	—	unknown	21:35–06:00 (good, 8.42 h)	79.2° 01:45	9.56	78%	72.1°
2046-10-10 Wed	100	—	unknown	23:30–06:00 (good, 6.5 h)	79.2° 01:40	9.61	86%	60.6°
2046-10-11 Thu	93	—	unknown	03:10–06:00 (good, 2.83 h)	79.2° 01:35	9.65	92%	49.3°
2046-10-12 Fri	85	—	unknown	05:55–06:00 (good, 0.08 h)	79.2° 01:30	9.7	96%	38.2°
2046-10-13 Sat	39	—	unknown	01:50–06:00 (marginal, 4.17 h)	79.2° 01:25	9.74	99%	27.8°
2046-10-14 Sun	31	—	unknown	03:15–06:05 (marginal, 2.83 h)	79.2° 01:25	9.78	100%	18.7°
2046-10-15 Mon	30	—	unknown	20:15–23:15 (marginal, 3.0 h)	79.2° 01:20	9.83	99%	14.4°
2046-10-16 Tue	35	—	unknown	20:15–00:10 (marginal, 3.92 h)	79.2° 01:15	9.87	96%	18.5°
2046-10-17 Wed	44	—	unknown	20:10–01:45 (marginal, 5.58 h)	79.2° 01:10	9.91	92%	27.7°
2046-10-18 Thu	81	—	unknown	20:10–20:20 (good, 0.17 h)	79.2° 01:05	9.96	86%	38.6°
2046-10-19 Fri	87	—	unknown	20:10–00:25 (good, 4.25 h)	79.2° 01:05	10.0	78%	50.2°
2046-10-20 Sat	95	—	unknown	20:05–04:00 (good, 7.92 h)	79.2° 01:00	10.04	70%	62.3°
2046-10-21 Sun	100	—	unknown	20:05–05:35 (good, 9.5 h)	79.2° 00:55	10.08	60%	74.8°
2046-10-22 Mon	100	—	unknown	20:05–06:05 (good, 10.0 h)	79.2° 00:50	10.12	49%	87.6°
2046-10-23 Tue	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.2° 00:50	10.16	38%	100.8°
2046-10-24 Wed	100	—	unknown	20:00–06:10 (good, 10.17 h)	79.2° 00:45	10.2	28%	114.4°
2046-10-25 Thu	100	—	unknown	20:00–06:10 (good, 10.17 h)	79.2° 00:40	10.24	18%	128.3°
2046-10-26 Fri	100	—	unknown	20:00–06:10 (good, 10.17 h)	79.2° 00:35	10.28	10%	142.1°
2046-10-27 Sat	100	—	unknown	20:00–05:05 (good, 10.08 h)	79.2° 00:30	10.32	4%	155.2°
2046-10-28 Sun	100	—	unknown	18:55–05:00 (good, 10.08 h)	79.2° 23:30	10.36	1%	164.7°
2046-10-29 Mon	100	—	unknown	18:55–04:55 (good, 10.0 h)	79.2° 23:25	10.4	0%	162.7°
2046-10-30 Tue	100	—	unknown	18:55–04:55 (good, 10.0 h)	79.2° 23:20	10.43	3%	151.7°
2046-10-31 Wed	100	—	unknown	18:55–04:50 (good, 9.92 h)	79.2° 23:15	10.47	8%	138.7°
2046-11-01 Thu	100	—	unknown	18:50–04:45 (good, 9.92 h)	79.2° 23:10	10.51	16%	125.4°
2046-11-02 Fri	100	—	unknown	18:50–04:40 (good, 9.83 h)	79.2° 23:10	10.54	25%	112.4°
2046-11-03 Sat	100	—	unknown	18:50–04:35 (good, 9.75 h)	79.2° 23:05	10.58	34%	99.7°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2046-10-05&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.