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: 07-18 (56), 07-17 (47), 07-16 (39), 07-04 (32), 07-15 (32) — by astronomy; check the weather when the night is within four days.

2047-06-19astronomy score per night — click a bar for that night2047-07-18

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2047-06-19 Wed	9	—	unknown	03:10–04:30 (marginal, 1.33 h)	79.2° 09:05	4.42	12%	21.6°
2047-06-20 Thu	11	—	unknown	03:35–03:40 (good, 0.08 h)	79.2° 09:00	4.42	6%	31.4°
2047-06-21 Fri	13	—	unknown	03:30–03:40 (good, 0.17 h)	79.2° 08:55	4.42	2%	42.5°
2047-06-22 Sat	15	—	unknown	03:25–03:40 (good, 0.25 h)	79.2° 08:50	4.42	0%	54.1°
2047-06-23 Sun	16	—	unknown	03:20–03:40 (good, 0.33 h)	79.2° 08:50	4.43	0%	66.1°
2047-06-24 Mon	17	—	unknown	03:15–03:40 (good, 0.42 h)	79.2° 08:45	4.44	2%	78.4°
2047-06-25 Tue	20	—	unknown	03:15–03:40 (good, 0.42 h)	79.2° 08:40	4.44	6%	91.0°
2047-06-26 Wed	22	—	unknown	03:10–03:40 (good, 0.5 h)	79.2° 08:35	4.45	13%	103.7°
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°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2047-06-19&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.