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: 08-01 (100), 08-02 (100), 08-03 (100), 08-04 (100), 07-31 (97) — by astronomy; check the weather when the night is within four days.

2044-07-06astronomy score per night — click a bar for that night2044-08-04

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-07-06 Wed	38	—	unknown	02:35–03:50 (good, 1.25 h)	79.2° 07:55	4.69	90%	142.3°
2044-07-07 Thu	38	—	unknown	02:30–03:50 (good, 1.33 h)	79.2° 07:50	4.72	95%	131.4°
2044-07-08 Fri	35	—	unknown	02:30–03:50 (good, 1.33 h)	79.2° 07:45	4.75	98%	120.2°
2044-07-09 Sat	33	—	unknown	02:30–03:55 (good, 1.42 h)	79.2° 07:40	4.79	100%	108.9°
2044-07-10 Sun	29	—	unknown	02:35–03:55 (good, 1.33 h)	79.2° 07:40	4.82	100%	97.5°
2044-07-11 Mon	25	—	unknown	03:05–03:55 (good, 0.83 h)	79.2° 07:35	4.86	97%	85.9°
2044-07-12 Tue	22	—	unknown	01:40–03:55 (marginal, 2.25 h)	79.2° 07:30	4.9	94%	74.3°
2044-07-13 Wed	20	—	unknown	01:40–04:00 (marginal, 2.33 h)	79.2° 07:25	4.94	88%	62.6°
2044-07-14 Thu	19	—	unknown	01:40–04:00 (marginal, 2.33 h)	79.2° 07:25	4.98	81%	50.8°
2044-07-15 Fri	19	—	unknown	01:30–04:00 (marginal, 2.5 h)	79.2° 07:20	5.03	72%	39.2°
2044-07-16 Sat	21	—	unknown	01:25–04:00 (marginal, 2.58 h)	79.2° 07:15	5.07	62%	27.9°
2044-07-17 Sun	28	—	unknown	03:20–04:05 (good, 0.75 h)	79.2° 07:10	5.11	52%	18.5°
2044-07-18 Mon	37	—	unknown	02:00–04:05 (good, 2.08 h)	79.2° 07:05	5.16	41%	15.6°
2044-07-19 Tue	47	—	unknown	01:50–04:05 (good, 2.25 h)	79.2° 07:05	5.21	30%	22.8°
2044-07-20 Wed	58	—	unknown	01:30–04:10 (good, 2.67 h)	79.2° 07:00	5.26	20%	34.7°
2044-07-21 Thu	67	—	unknown	01:30–04:10 (good, 2.67 h)	79.2° 06:55	5.3	12%	48.1°
2044-07-22 Fri	74	—	unknown	01:25–04:10 (good, 2.75 h)	79.2° 06:50	5.35	5%	62.3°
2044-07-23 Sat	78	—	unknown	01:20–04:10 (good, 2.83 h)	79.2° 06:45	5.4	1%	76.8°
2044-07-24 Sun	81	—	unknown	01:15–04:15 (good, 3.0 h)	79.2° 06:45	5.45	0%	91.4°
2044-07-25 Mon	83	—	unknown	01:10–04:15 (good, 3.08 h)	79.2° 06:40	5.51	2%	105.7°
2044-07-26 Tue	85	—	unknown	01:10–04:15 (good, 3.08 h)	79.2° 06:35	5.56	7%	119.7°
2044-07-27 Wed	89	—	unknown	01:05–04:20 (good, 3.25 h)	79.2° 06:30	5.61	14%	133.1°
2044-07-28 Thu	91	—	unknown	01:00–04:20 (good, 3.33 h)	79.2° 06:30	5.67	22%	145.7°
2044-07-29 Fri	93	—	unknown	00:55–04:20 (good, 3.42 h)	79.2° 06:25	5.72	32%	156.7°
2044-07-30 Sat	95	—	unknown	00:50–04:25 (good, 3.58 h)	79.2° 06:20	5.77	42%	164.0°
2044-07-31 Sun	97	—	unknown	00:50–04:25 (good, 3.58 h)	79.2° 06:15	5.83	52%	163.1°
2044-08-01 Mon	100	—	unknown	00:45–04:25 (good, 3.67 h)	79.2° 06:10	5.88	62%	155.3°
2044-08-02 Tue	100	—	unknown	00:45–04:30 (good, 3.75 h)	79.2° 06:10	5.94	71%	145.2°
2044-08-03 Wed	100	—	unknown	00:45–04:30 (good, 3.75 h)	79.2° 06:05	5.99	79%	134.3°
2044-08-04 Thu	100	—	unknown	00:40–04:30 (good, 3.83 h)	79.2° 06:00	6.05	86%	123.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-07-06&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.