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: 08-10 (100), 08-11 (100), 08-12 (100), 08-13 (100), 08-14 (100) — by astronomy; check the weather when the night is within four days.

2034-07-23astronomy score per night — click a bar for that night2034-08-21

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-07-23 Sun	75	—	unknown	01:20–04:10 (good, 2.83 h)	79.1° 06:50	5.38	56%	156.7°
2034-07-24 Mon	79	—	unknown	01:25–04:15 (good, 2.83 h)	79.1° 06:45	5.43	65%	151.3°
2034-07-25 Tue	80	—	unknown	01:20–04:15 (good, 2.92 h)	79.1° 06:40	5.48	74%	142.9°
2034-07-26 Wed	81	—	unknown	01:15–04:15 (good, 3.0 h)	79.1° 06:35	5.53	82%	133.2°
2034-07-27 Thu	83	—	unknown	01:15–04:20 (good, 3.08 h)	79.1° 06:35	5.58	89%	122.5°
2034-07-28 Fri	71	—	unknown	01:15–04:20 (good, 3.08 h)	79.1° 06:30	5.63	94%	111.4°
2034-07-29 Sat	61	—	unknown	01:20–04:20 (good, 3.0 h)	79.1° 06:25	5.69	98%	99.8°
2034-07-30 Sun	50	—	unknown	02:05–04:20 (good, 2.25 h)	79.1° 06:20	5.74	100%	87.9°
2034-07-31 Mon	41	—	unknown	03:15–04:25 (good, 1.17 h)	79.1° 06:20	5.8	99%	75.8°
2034-08-01 Tue	32	—	unknown	00:35–04:25 (marginal, 3.83 h)	79.1° 06:15	5.85	97%	63.6°
2034-08-02 Wed	26	—	unknown	00:30–04:25 (marginal, 3.92 h)	79.1° 06:10	5.91	92%	51.5°
2034-08-03 Thu	24	—	unknown	00:25–04:30 (marginal, 4.08 h)	79.1° 06:05	5.96	85%	39.9°
2034-08-04 Fri	26	—	unknown	00:15–04:30 (marginal, 4.25 h)	79.1° 06:00	6.02	76%	29.7°
2034-08-05 Sat	36	—	unknown	00:05–04:30 (marginal, 4.42 h)	79.1° 06:00	6.07	65%	23.2°
2034-08-06 Sun	50	—	unknown	00:55–04:35 (good, 3.67 h)	79.1° 05:55	6.13	54%	24.0°
2034-08-07 Mon	72	—	unknown	00:25–04:35 (good, 4.17 h)	79.1° 05:50	6.19	42%	31.5°
2034-08-08 Tue	87	—	unknown	00:20–04:35 (good, 4.25 h)	79.1° 05:45	6.24	31%	42.3°
2034-08-09 Wed	94	—	unknown	00:15–04:40 (good, 4.42 h)	79.1° 05:40	6.3	21%	54.4°
2034-08-10 Thu	100	—	unknown	00:10–04:40 (good, 4.5 h)	79.1° 05:40	6.36	13%	67.1°
2034-08-11 Fri	100	—	unknown	00:05–04:40 (good, 4.58 h)	79.1° 05:35	6.42	6%	80.0°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-07-23&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.