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: 07-24 (78), 07-25 (78), 07-23 (77), 07-22 (74), 07-21 (72) — by astronomy; check the weather when the night is within four days.

2045-07-02astronomy score per night — click a bar for that night2045-07-31

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2045-07-02 Sun	14	—	unknown	02:20–03:45 (marginal, 1.42 h)	79.2° 08:10	4.57	88%	73.1°
2045-07-03 Mon	13	—	unknown	02:20–03:45 (marginal, 1.42 h)	79.2° 08:05	4.59	82%	61.7°
2045-07-04 Tue	13	—	unknown	02:15–03:45 (marginal, 1.5 h)	79.2° 08:05	4.62	74%	50.4°
2045-07-05 Wed	14	—	unknown	02:10–03:50 (marginal, 1.67 h)	79.2° 08:00	4.65	65%	39.2°
2045-07-06 Thu	17	—	unknown	02:00–03:50 (marginal, 1.83 h)	79.2° 07:55	4.68	55%	28.3°
2045-07-07 Fri	21	—	unknown	02:50–03:50 (good, 1.0 h)	79.2° 07:50	4.71	45%	18.8°
2045-07-08 Sat	27	—	unknown	02:40–03:50 (good, 1.17 h)	79.2° 07:45	4.74	35%	14.5°
2045-07-09 Sun	33	—	unknown	02:25–03:50 (good, 1.42 h)	79.2° 07:45	4.78	26%	19.9°
2045-07-10 Mon	40	—	unknown	02:10–03:55 (good, 1.75 h)	79.2° 07:40	4.81	17%	30.8°
2045-07-11 Tue	46	—	unknown	02:10–03:55 (good, 1.75 h)	79.2° 07:35	4.85	9%	43.6°
2045-07-12 Wed	50	—	unknown	02:05–03:55 (good, 1.83 h)	79.2° 07:30	4.89	3%	57.3°
2045-07-13 Thu	53	—	unknown	02:00–04:00 (good, 2.0 h)	79.2° 07:30	4.93	0%	71.6°
2045-07-14 Fri	56	—	unknown	01:55–04:00 (good, 2.08 h)	79.2° 07:25	4.97	0%	86.2°
2045-07-15 Sat	57	—	unknown	01:50–04:00 (good, 2.17 h)	79.2° 07:20	5.02	3%	100.8°
2045-07-16 Sun	59	—	unknown	01:50–04:00 (good, 2.17 h)	79.2° 07:15	5.06	9%	115.4°
2045-07-17 Mon	62	—	unknown	01:45–04:05 (good, 2.33 h)	79.2° 07:10	5.1	17%	129.5°
2045-07-18 Tue	65	—	unknown	01:40–04:05 (good, 2.42 h)	79.2° 07:10	5.15	27%	142.9°
2045-07-19 Wed	66	—	unknown	01:35–04:05 (good, 2.5 h)	79.2° 07:05	5.2	38%	155.1°
2045-07-20 Thu	70	—	unknown	01:35–04:10 (good, 2.58 h)	79.2° 07:00	5.24	48%	164.1°
2045-07-21 Fri	72	—	unknown	01:30–04:10 (good, 2.67 h)	79.2° 06:55	5.29	59%	164.3°
2045-07-22 Sat	74	—	unknown	01:25–04:10 (good, 2.75 h)	79.2° 06:50	5.34	69%	156.1°
2045-07-23 Sun	77	—	unknown	01:25–04:10 (good, 2.75 h)	79.2° 06:50	5.39	78%	145.3°
2045-07-24 Mon	78	—	unknown	01:25–04:15 (good, 2.83 h)	79.2° 06:45	5.44	86%	133.8°
2045-07-25 Tue	78	—	unknown	01:20–04:15 (good, 2.92 h)	79.2° 06:40	5.49	92%	122.2°
2045-07-26 Wed	67	—	unknown	01:25–04:15 (good, 2.83 h)	79.2° 06:35	5.55	96%	110.6°
2045-07-27 Thu	59	—	unknown	01:30–04:20 (good, 2.83 h)	79.2° 06:35	5.6	99%	99.1°
2045-07-28 Fri	49	—	unknown	02:00–04:20 (good, 2.33 h)	79.2° 06:30	5.65	100%	87.5°
2045-07-29 Sat	40	—	unknown	03:10–04:20 (good, 1.17 h)	79.2° 06:25	5.71	99%	76.1°
2045-07-30 Sun	32	—	unknown	00:40–04:25 (marginal, 3.75 h)	79.2° 06:20	5.76	96%	64.7°
2045-07-31 Mon	26	—	unknown	00:40–04:25 (marginal, 3.75 h)	79.2° 06:15	5.81	92%	53.3°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2045-07-02&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.