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: 08-02 (100), 08-03 (100), 08-04 (100), 08-05 (100), 08-06 (100) — by astronomy; check the weather when the night is within four days.

2035-07-08astronomy score per night — click a bar for that night2035-08-06

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-07-08 Sun	41	—	unknown	02:20–03:50 (good, 1.5 h)	79.1° 07:50	4.73	17%	119.9°
2035-07-09 Mon	43	—	unknown	02:20–03:50 (good, 1.5 h)	79.1° 07:45	4.76	26%	131.8°
2035-07-10 Tue	46	—	unknown	02:15–03:55 (good, 1.67 h)	79.1° 07:40	4.79	36%	142.6°
2035-07-11 Wed	48	—	unknown	02:10–03:55 (good, 1.75 h)	79.1° 07:35	4.83	46%	151.2°
2035-07-12 Thu	50	—	unknown	02:05–03:55 (good, 1.83 h)	79.1° 07:35	4.87	56%	156.0°
2035-07-13 Fri	51	—	unknown	02:00–03:55 (good, 1.92 h)	79.1° 07:30	4.91	66%	155.2°
2035-07-14 Sat	53	—	unknown	02:05–04:00 (good, 1.92 h)	79.1° 07:25	4.95	75%	149.5°
2035-07-15 Sun	55	—	unknown	02:00–04:00 (good, 2.0 h)	79.1° 07:20	4.99	82%	141.1°
2035-07-16 Mon	55	—	unknown	02:00–04:00 (good, 2.0 h)	79.1° 07:20	5.03	89%	131.5°
2035-07-17 Tue	51	—	unknown	01:55–04:00 (good, 2.08 h)	79.1° 07:15	5.08	94%	121.3°
2035-07-18 Wed	47	—	unknown	02:00–04:05 (good, 2.08 h)	79.1° 07:10	5.12	98%	110.7°
2035-07-19 Thu	41	—	unknown	02:05–04:05 (good, 2.0 h)	79.1° 07:05	5.17	100%	99.8°
2035-07-20 Fri	36	—	unknown	02:35–04:05 (good, 1.5 h)	79.1° 07:00	5.22	100%	88.8°
2035-07-21 Sat	31	—	unknown	03:30–04:10 (good, 0.67 h)	79.1° 07:00	5.26	98%	77.8°
2035-07-22 Sun	26	—	unknown	01:10–04:10 (marginal, 3.0 h)	79.1° 06:55	5.31	94%	66.6°
2035-07-23 Mon	23	—	unknown	01:05–04:10 (marginal, 3.08 h)	79.1° 06:50	5.36	89%	55.6°
2035-07-24 Tue	23	—	unknown	01:00–04:15 (marginal, 3.25 h)	79.1° 06:45	5.41	82%	44.8°
2035-07-25 Wed	25	—	unknown	00:55–04:15 (marginal, 3.33 h)	79.1° 06:40	5.46	73%	34.8°
2035-07-26 Thu	31	—	unknown	00:45–04:15 (marginal, 3.5 h)	79.1° 06:40	5.52	63%	26.9°
2035-07-27 Fri	40	—	unknown	01:35–04:15 (good, 2.67 h)	79.1° 06:35	5.57	52%	23.7°
2035-07-28 Sat	54	—	unknown	01:05–04:20 (good, 3.25 h)	79.1° 06:30	5.62	41%	27.4°
2035-07-29 Sun	69	—	unknown	01:00–04:20 (good, 3.33 h)	79.1° 06:25	5.67	30%	36.3°
2035-07-30 Mon	82	—	unknown	00:55–04:20 (good, 3.42 h)	79.1° 06:25	5.73	20%	47.8°
2035-07-31 Tue	93	—	unknown	00:50–04:25 (good, 3.58 h)	79.1° 06:20	5.78	11%	60.6°
2035-08-01 Wed	98	—	unknown	00:45–04:25 (good, 3.67 h)	79.1° 06:15	5.84	5%	74.0°
2035-08-02 Thu	100	—	unknown	00:45–04:25 (good, 3.67 h)	79.1° 06:10	5.89	1%	87.6°
2035-08-03 Fri	100	—	unknown	00:40–04:30 (good, 3.83 h)	79.1° 06:05	5.95	0%	101.2°
2035-08-04 Sat	100	—	unknown	00:35–04:30 (good, 3.92 h)	79.1° 06:05	6.0	2%	114.4°
2035-08-05 Sun	100	—	unknown	00:30–04:30 (good, 4.0 h)	79.1° 06:00	6.06	7%	127.1°
2035-08-06 Mon	100	—	unknown	00:30–04:35 (good, 4.08 h)	79.1° 05:55	6.12	13%	138.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-07-08&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.