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: 08-12 (100), 08-13 (100), 08-14 (100), 08-15 (100), 08-16 (100) — by astronomy; check the weather when the night is within four days.

2034-08-12astronomy score per night — click a bar for that night2034-09-10

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-08-12 Sat	100	—	unknown	00:05–04:45 (good, 4.67 h)	79.1° 05:30	6.47	2%	92.8°
2034-08-13 Sun	100	—	unknown	00:00–04:45 (good, 4.75 h)	79.1° 05:25	6.53	0%	105.3°
2034-08-14 Mon	100	—	unknown	23:55–04:45 (good, 4.83 h)	79.1° 05:25	6.59	1%	117.5°
2034-08-15 Tue	100	—	unknown	23:50–04:50 (good, 5.0 h)	79.1° 05:20	6.65	4%	129.1°
2034-08-16 Wed	100	—	unknown	23:45–04:50 (good, 5.08 h)	79.1° 05:15	6.7	8%	139.8°
2034-08-17 Thu	100	—	unknown	23:45–04:50 (good, 5.08 h)	79.1° 05:10	6.76	15%	149.1°
2034-08-18 Fri	100	—	unknown	23:40–04:50 (good, 5.17 h)	79.1° 05:05	6.82	22%	155.6°
2034-08-19 Sat	100	—	unknown	23:35–04:55 (good, 5.33 h)	79.1° 05:05	6.88	31%	157.2°
2034-08-20 Sun	100	—	unknown	23:30–04:55 (good, 5.42 h)	79.1° 05:00	6.93	40%	153.4°
2034-08-21 Mon	100	—	unknown	23:30–04:55 (good, 5.42 h)	79.1° 04:55	6.99	49%	145.8°
2034-08-22 Tue	100	—	unknown	23:30–05:00 (good, 5.5 h)	79.1° 04:50	7.05	58%	136.5°
2034-08-23 Wed	100	—	unknown	23:25–05:00 (good, 5.58 h)	79.1° 04:45	7.11	68%	126.2°
2034-08-24 Thu	100	—	unknown	23:25–05:00 (good, 5.58 h)	79.1° 04:45	7.16	77%	115.4°
2034-08-25 Fri	100	—	unknown	23:30–05:00 (good, 5.5 h)	79.1° 04:40	7.22	84%	104.0°
2034-08-26 Sat	100	—	unknown	23:35–05:05 (good, 5.5 h)	79.1° 04:35	7.28	91%	92.2°
2034-08-27 Sun	78	—	unknown	00:45–05:05 (good, 4.33 h)	79.1° 04:30	7.33	96%	80.2°
2034-08-28 Mon	66	—	unknown	02:35–05:05 (good, 2.5 h)	79.1° 04:30	7.39	99%	67.8°
2034-08-29 Tue	48	—	unknown	22:50–05:10 (marginal, 6.33 h)	79.1° 04:25	7.45	100%	55.5°
2034-08-30 Wed	33	—	unknown	22:50–05:10 (marginal, 6.33 h)	79.1° 04:20	7.5	98%	43.4°
2034-08-31 Thu	25	—	unknown	22:45–05:10 (marginal, 6.42 h)	79.1° 04:15	7.56	94%	32.4°
2034-09-01 Fri	32	—	unknown	22:30–05:10 (marginal, 6.67 h)	79.1° 04:10	7.61	87%	24.4°
2034-09-02 Sat	44	—	unknown	22:10–05:15 (marginal, 7.08 h)	79.1° 04:10	7.67	78%	23.1°
2034-09-03 Sun	75	—	unknown	22:35–23:00 (good, 0.42 h)	79.1° 04:05	7.73	68%	29.4°
2034-09-04 Mon	85	—	unknown	22:35–05:15 (good, 6.67 h)	79.1° 04:00	7.78	56%	39.7°
2034-09-05 Tue	92	—	unknown	22:30–05:15 (good, 6.75 h)	79.1° 03:55	7.84	45%	51.5°
2034-09-06 Wed	99	—	unknown	22:25–05:20 (good, 6.92 h)	79.1° 03:50	7.89	34%	64.0°
2034-09-07 Thu	100	—	unknown	22:20–05:20 (good, 7.0 h)	79.1° 03:50	7.95	24%	76.6°
2034-09-08 Fri	100	—	unknown	22:15–05:20 (good, 7.08 h)	79.1° 03:45	8.0	15%	89.1°
2034-09-09 Sat	100	—	unknown	22:15–05:25 (good, 7.17 h)	79.1° 03:40	8.05	8%	101.5°
2034-09-10 Sun	100	—	unknown	22:10–05:25 (good, 7.25 h)	79.1° 03:35	8.11	3%	113.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-08-12&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.