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: 10-04 (100), 10-05 (100), 10-06 (100), 10-07 (100), 10-08 (100) — by astronomy; check the weather when the night is within four days.

2034-09-27astronomy score per night — click a bar for that night2034-10-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-09-27 Wed	43	—	unknown	21:05–05:45 (marginal, 8.67 h)	79.1° 02:30	8.99	100%	36.5°
2034-09-28 Thu	30	—	unknown	21:00–00:55 (marginal, 3.92 h)	79.1° 02:25	9.04	99%	26.8°
2034-09-29 Fri	36	—	unknown	20:40–02:30 (marginal, 5.83 h)	79.1° 02:20	9.09	95%	22.6°
2034-09-30 Sat	60	—	unknown	20:50–20:55 (good, 0.08 h)	79.1° 02:20	9.13	89%	26.8°
2034-10-01 Sun	83	—	unknown	20:45–21:40 (good, 0.92 h)	79.1° 02:15	9.18	80%	36.6°
2034-10-02 Mon	89	—	unknown	20:45–02:40 (good, 5.92 h)	79.1° 02:10	9.23	70%	48.4°
2034-10-03 Tue	97	—	unknown	20:40–05:50 (good, 9.17 h)	79.1° 02:05	9.28	59%	61.0°
2034-10-04 Wed	100	—	unknown	20:35–05:50 (good, 9.25 h)	79.1° 02:00	9.33	48%	73.6°
2034-10-05 Thu	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.1° 02:00	9.37	37%	86.2°
2034-10-06 Fri	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.1° 01:55	9.42	27%	98.5°
2034-10-07 Sat	100	—	unknown	20:30–05:55 (good, 9.42 h)	79.1° 01:50	9.47	18%	110.5°
2034-10-08 Sun	100	—	unknown	20:25–05:55 (good, 9.5 h)	79.1° 01:45	9.51	11%	122.2°
2034-10-09 Mon	100	—	unknown	20:25–06:00 (good, 9.58 h)	79.1° 01:40	9.56	6%	133.2°
2034-10-10 Tue	100	—	unknown	20:25–06:00 (good, 9.58 h)	79.1° 01:40	9.6	2%	143.4°
2034-10-11 Wed	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.1° 01:35	9.65	0%	151.8°
2034-10-12 Thu	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.1° 01:30	9.69	0%	156.8°
2034-10-13 Fri	100	—	unknown	20:20–06:00 (good, 9.67 h)	79.1° 01:25	9.74	2%	156.4°
2034-10-14 Sat	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:25	9.78	6%	150.9°
2034-10-15 Sun	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:20	9.82	12%	142.6°
2034-10-16 Mon	100	—	unknown	20:15–06:05 (good, 9.83 h)	79.1° 01:15	9.87	18%	133.0°
2034-10-17 Tue	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.1° 01:10	9.91	26%	122.7°
2034-10-18 Wed	100	—	unknown	20:10–06:05 (good, 9.92 h)	79.1° 01:05	9.95	35%	111.9°
2034-10-19 Thu	100	—	unknown	20:10–06:10 (good, 10.0 h)	79.1° 01:05	9.99	44%	100.9°
2034-10-20 Fri	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 01:00	10.04	54%	89.5°
2034-10-21 Sat	100	—	unknown	20:05–06:10 (good, 10.08 h)	79.1° 00:55	10.08	64%	77.8°
2034-10-22 Sun	100	—	unknown	21:00–06:10 (good, 9.17 h)	79.1° 00:50	10.12	74%	65.8°
2034-10-23 Mon	95	—	unknown	00:20–06:15 (good, 5.92 h)	79.1° 00:45	10.16	83%	53.7°
2034-10-24 Tue	86	—	unknown	04:55–06:15 (good, 1.33 h)	79.1° 00:45	10.2	90%	41.7°
2034-10-25 Wed	63	—	unknown	06:05–06:10 (good, 0.08 h)	79.1° 00:40	10.24	96%	30.8°
2034-10-26 Thu	34	—	unknown	02:10–06:10 (marginal, 4.0 h)	79.1° 00:35	10.28	99%	23.5°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-09-27&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.