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: 07-23 (77), 07-22 (70), 07-21 (62), 07-20 (50), 07-07 (40) — by astronomy; check the weather when the night is within four days.

2033-06-24astronomy score per night — click a bar for that night2033-07-23

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-06-24 Fri	19	—	unknown	03:15–03:40 (good, 0.42 h)	79.1° 08:40	4.44	5%	42.0°
2033-06-25 Sat	21	—	unknown	03:10–03:40 (good, 0.5 h)	79.1° 08:40	4.45	1%	54.2°
2033-06-26 Sun	22	—	unknown	03:05–03:40 (good, 0.58 h)	79.1° 08:35	4.46	0%	66.6°
2033-06-27 Mon	23	—	unknown	03:05–03:40 (good, 0.58 h)	79.1° 08:30	4.47	2%	78.9°
2033-06-28 Tue	25	—	unknown	03:00–03:40 (good, 0.67 h)	79.1° 08:25	4.49	5%	91.1°
2033-06-29 Wed	27	—	unknown	02:55–03:40 (good, 0.75 h)	79.1° 08:20	4.5	10%	102.9°
2033-06-30 Thu	29	—	unknown	02:50–03:45 (good, 0.92 h)	79.1° 08:20	4.52	17%	114.4°
2033-07-01 Fri	30	—	unknown	02:45–03:45 (good, 1.0 h)	79.1° 08:15	4.54	25%	125.5°
2033-07-02 Sat	31	—	unknown	02:45–03:45 (good, 1.0 h)	79.1° 08:10	4.57	33%	136.1°
2033-07-03 Sun	33	—	unknown	02:40–03:45 (good, 1.08 h)	79.1° 08:05	4.59	43%	145.9°
2033-07-04 Mon	35	—	unknown	02:35–03:45 (good, 1.17 h)	79.1° 08:05	4.62	52%	154.1°
2033-07-05 Tue	37	—	unknown	02:30–03:50 (good, 1.33 h)	79.1° 08:00	4.65	62%	159.0°
2033-07-06 Wed	39	—	unknown	02:30–03:50 (good, 1.33 h)	79.1° 07:55	4.68	71%	157.8°
2033-07-07 Thu	40	—	unknown	02:30–03:50 (good, 1.33 h)	79.1° 07:50	4.71	79%	151.3°
2033-07-08 Fri	40	—	unknown	02:25–03:50 (good, 1.42 h)	79.1° 07:45	4.74	87%	141.7°
2033-07-09 Sat	37	—	unknown	02:25–03:50 (good, 1.42 h)	79.1° 07:45	4.78	93%	130.7°
2033-07-10 Sun	38	—	unknown	02:25–03:55 (good, 1.5 h)	79.1° 07:40	4.81	97%	118.8°
2033-07-11 Mon	33	—	unknown	02:25–03:55 (good, 1.5 h)	79.1° 07:35	4.85	100%	106.3°
2033-07-12 Tue	28	—	unknown	02:45–03:55 (good, 1.17 h)	79.1° 07:30	4.89	99%	93.4°
2033-07-13 Wed	23	—	unknown	03:50–03:55 (good, 0.08 h)	79.1° 07:25	4.93	97%	80.2°
2033-07-14 Thu	20	—	unknown	01:40–04:00 (marginal, 2.33 h)	79.1° 07:25	4.97	92%	67.0°
2033-07-15 Fri	18	—	unknown	01:35–04:00 (marginal, 2.42 h)	79.1° 07:20	5.01	84%	53.9°
2033-07-16 Sat	19	—	unknown	01:30–04:00 (marginal, 2.5 h)	79.1° 07:15	5.06	75%	41.3°
2033-07-17 Sun	22	—	unknown	01:20–04:05 (marginal, 2.75 h)	79.1° 07:10	5.1	64%	30.0°
2033-07-18 Mon	30	—	unknown	02:55–04:05 (good, 1.17 h)	79.1° 07:10	5.15	53%	22.2°
2033-07-19 Tue	39	—	unknown	01:55–04:05 (good, 2.17 h)	79.1° 07:05	5.19	41%	21.7°
2033-07-20 Wed	50	—	unknown	01:35–04:05 (good, 2.5 h)	79.1° 07:00	5.24	31%	28.6°
2033-07-21 Thu	62	—	unknown	01:30–04:10 (good, 2.67 h)	79.1° 06:55	5.29	21%	39.1°
2033-07-22 Fri	70	—	unknown	01:25–04:10 (good, 2.75 h)	79.1° 06:50	5.34	13%	50.8°
2033-07-23 Sat	77	—	unknown	01:20–04:10 (good, 2.83 h)	79.1° 06:50	5.39	6%	62.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-06-24&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.