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: 07-26 (84), 07-25 (82), 07-24 (79), 07-23 (75), 07-22 (73) — by astronomy; check the weather when the night is within four days.

2047-06-27astronomy score per night — click a bar for that night2047-07-26

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-06-27 Thu	23	—	unknown	03:05–03:40 (good, 0.58 h)	79.2° 08:35	4.47	21%	116.6°
2047-06-28 Fri	25	—	unknown	03:00–03:40 (good, 0.67 h)	79.2° 08:30	4.48	30%	129.6°
2047-06-29 Sat	25	—	unknown	02:55–03:40 (good, 0.75 h)	79.2° 08:25	4.5	41%	142.5°
2047-06-30 Sun	28	—	unknown	02:55–03:45 (good, 0.83 h)	79.2° 08:20	4.52	52%	154.7°
2047-07-01 Mon	29	—	unknown	02:50–03:45 (good, 0.92 h)	79.2° 08:15	4.54	64%	164.2°
2047-07-02 Tue	31	—	unknown	02:45–03:45 (good, 1.0 h)	79.2° 08:15	4.56	74%	163.8°
2047-07-03 Wed	31	—	unknown	02:40–03:45 (good, 1.08 h)	79.2° 08:10	4.58	84%	153.9°
2047-07-04 Thu	32	—	unknown	02:45–03:45 (good, 1.0 h)	79.2° 08:05	4.61	92%	141.1°
2047-07-05 Fri	30	—	unknown	02:40–03:45 (good, 1.08 h)	79.2° 08:00	4.64	97%	127.6°
2047-07-06 Sat	29	—	unknown	02:45–03:50 (good, 1.08 h)	79.2° 07:55	4.67	100%	113.8°
2047-07-07 Sun	25	—	unknown	02:50–03:50 (good, 1.0 h)	79.2° 07:55	4.7	100%	100.2°
2047-07-08 Mon	21	—	unknown	03:25–03:50 (good, 0.42 h)	79.2° 07:50	4.73	97%	86.9°
2047-07-09 Tue	18	—	unknown	01:55–03:50 (marginal, 1.92 h)	79.2° 07:45	4.76	92%	73.9°
2047-07-10 Wed	16	—	unknown	01:55–03:55 (marginal, 2.0 h)	79.2° 07:40	4.8	86%	61.3°
2047-07-11 Thu	16	—	unknown	01:55–03:55 (marginal, 2.0 h)	79.2° 07:40	4.83	78%	49.2°
2047-07-12 Fri	16	—	unknown	01:50–03:55 (marginal, 2.08 h)	79.2° 07:35	4.87	70%	37.7°
2047-07-13 Sat	19	—	unknown	01:40–03:55 (marginal, 2.25 h)	79.2° 07:30	4.91	60%	27.0°
2047-07-14 Sun	25	—	unknown	03:35–04:00 (good, 0.42 h)	79.2° 07:25	4.95	51%	18.1°
2047-07-15 Mon	32	—	unknown	02:15–04:00 (good, 1.75 h)	79.2° 07:20	5.0	41%	14.3°
2047-07-16 Tue	39	—	unknown	02:05–04:00 (good, 1.92 h)	79.2° 07:20	5.04	32%	19.0°
2047-07-17 Wed	47	—	unknown	01:45–04:00 (good, 2.25 h)	79.2° 07:15	5.08	24%	28.1°
2047-07-18 Thu	56	—	unknown	01:40–04:05 (good, 2.42 h)	79.2° 07:10	5.13	16%	38.9°
2047-07-19 Fri	63	—	unknown	01:40–04:05 (good, 2.42 h)	79.2° 07:05	5.17	9%	50.3°
2047-07-20 Sat	68	—	unknown	01:35–04:05 (good, 2.5 h)	79.2° 07:00	5.22	4%	62.3°
2047-07-21 Sun	71	—	unknown	01:30–04:10 (good, 2.67 h)	79.2° 07:00	5.27	1%	74.6°
2047-07-22 Mon	73	—	unknown	01:25–04:10 (good, 2.75 h)	79.2° 06:55	5.32	0%	87.2°
2047-07-23 Tue	75	—	unknown	01:25–04:10 (good, 2.75 h)	79.2° 06:50	5.37	1%	100.2°
2047-07-24 Wed	79	—	unknown	01:20–04:15 (good, 2.92 h)	79.2° 06:45	5.42	5%	113.3°
2047-07-25 Thu	82	—	unknown	01:15–04:15 (good, 3.0 h)	79.2° 06:40	5.47	10%	126.5°
2047-07-26 Fri	84	—	unknown	01:10–04:15 (good, 3.08 h)	79.2° 06:40	5.52	18%	139.6°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-06-27&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.