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

2042-10-01astronomy score per night — click a bar for that night2042-10-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2042-10-01 Wed	40	—	unknown	20:40–05:50 (marginal, 9.17 h)	79.2° 02:15	9.19	91%	20.0°
2042-10-02 Thu	63	—	unknown	20:45–20:50 (good, 0.08 h)	79.2° 02:10	9.23	83%	29.5°
2042-10-03 Fri	82	—	unknown	20:40–00:40 (good, 4.0 h)	79.2° 02:05	9.28	73%	41.6°
2042-10-04 Sat	89	—	unknown	20:35–04:55 (good, 8.33 h)	79.2° 02:00	9.33	63%	54.2°
2042-10-05 Sun	97	—	unknown	20:30–05:55 (good, 9.42 h)	79.2° 02:00	9.38	52%	66.9°
2042-10-06 Mon	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.2° 01:55	9.42	41%	79.3°
2042-10-07 Tue	100	—	unknown	20:25–05:55 (good, 9.5 h)	79.2° 01:50	9.47	32%	91.4°
2042-10-08 Wed	100	—	unknown	20:25–05:55 (good, 9.5 h)	79.2° 01:45	9.51	23%	103.2°
2042-10-09 Thu	100	—	unknown	20:25–06:00 (good, 9.58 h)	79.2° 01:45	9.56	15%	114.8°
2042-10-10 Fri	100	—	unknown	20:25–06:00 (good, 9.58 h)	79.2° 01:40	9.61	9%	126.1°
2042-10-11 Sat	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.2° 01:35	9.65	4%	137.0°
2042-10-12 Sun	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.2° 01:30	9.69	1%	147.3°
2042-10-13 Mon	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.2° 01:25	9.74	0%	156.2°
2042-10-14 Tue	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.2° 01:25	9.78	1%	161.6°
2042-10-15 Wed	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.2° 01:20	9.83	3%	160.6°
2042-10-16 Thu	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.2° 01:15	9.87	7%	153.8°
2042-10-17 Fri	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.2° 01:10	9.91	13%	144.2°
2042-10-18 Sat	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.2° 01:05	9.95	20%	133.6°
2042-10-19 Sun	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.2° 01:05	10.0	28%	122.3°
2042-10-20 Mon	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.2° 01:00	10.04	38%	110.5°
2042-10-21 Tue	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.2° 00:55	10.08	48%	98.3°
2042-10-22 Wed	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.2° 00:50	10.12	58%	85.8°
2042-10-23 Thu	100	—	unknown	20:05–06:15 (good, 10.17 h)	79.2° 00:50	10.16	69%	72.8°
2042-10-24 Fri	99	—	unknown	21:40–06:15 (good, 8.58 h)	79.2° 00:45	10.2	79%	59.6°
2042-10-25 Sat	89	—	unknown	02:30–05:10 (good, 3.67 h)	79.2° 00:40	10.24	88%	46.2°
2042-10-26 Sun	75	—	unknown	04:45–05:10 (good, 0.42 h)	79.2° 23:35	10.28	94%	33.2°
2042-10-27 Mon	35	—	unknown	00:55–05:10 (marginal, 4.25 h)	79.2° 23:30	10.32	99%	22.1°
2042-10-28 Tue	31	—	unknown	18:55–21:40 (marginal, 2.75 h)	79.2° 23:30	10.36	100%	18.0°
2042-10-29 Wed	35	—	unknown	18:55–22:30 (marginal, 3.58 h)	79.2° 23:25	10.4	98%	24.7°
2042-10-30 Thu	52	—	unknown	18:55–02:05 (marginal, 7.17 h)	79.2° 23:20	10.43	93%	36.4°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2042-10-01&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.