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 North America Nebula: 06-23 (100), 06-24 (100), 06-25 (100), 06-26 (100), 06-27 (100) — by astronomy; check the weather when the night is within four days.

2033-06-23astronomy score per night — click a bar for that night2033-07-22

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-06-23 Thu	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 04:10	4.43	11%	84.8°
2033-06-24 Fri	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 04:05	4.44	5%	92.9°
2033-06-25 Sat	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 04:05	4.45	1%	100.9°
2033-06-26 Sun	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 04:00	4.46	0%	108.3°
2033-06-27 Mon	100	—	unknown	23:15–03:40 (good, 4.42 h)	87.2° 03:55	4.47	2%	114.8°
2033-06-28 Tue	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 03:50	4.49	5%	120.0°
2033-06-29 Wed	100	—	unknown	23:10–03:40 (good, 4.5 h)	87.2° 03:45	4.5	10%	123.7°
2033-06-30 Thu	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:45	4.52	17%	125.5°
2033-07-01 Fri	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:40	4.54	25%	125.5°
2033-07-02 Sat	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:35	4.57	33%	123.8°
2033-07-03 Sun	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:30	4.59	43%	120.4°
2033-07-04 Mon	100	—	unknown	23:10–03:45 (good, 4.58 h)	87.2° 03:30	4.62	52%	115.8°
2033-07-05 Tue	100	—	unknown	23:10–03:50 (good, 4.67 h)	87.2° 03:25	4.65	62%	110.2°
2033-07-06 Wed	100	—	unknown	23:10–03:50 (good, 4.67 h)	87.2° 03:20	4.68	71%	103.9°
2033-07-07 Thu	100	—	unknown	23:05–03:50 (good, 4.75 h)	87.2° 03:15	4.71	79%	97.0°
2033-07-08 Fri	100	—	unknown	23:05–03:50 (good, 4.75 h)	87.2° 03:10	4.74	87%	89.7°
2033-07-09 Sat	79	—	unknown	23:05–03:50 (good, 4.75 h)	87.2° 03:10	4.78	93%	82.2°
2033-07-10 Sun	71	—	unknown	23:05–03:55 (good, 4.83 h)	87.2° 03:05	4.81	97%	74.8°
2033-07-11 Mon	59	—	unknown	00:00–03:55 (good, 3.92 h)	87.2° 03:00	4.85	100%	67.9°
2033-07-12 Tue	50	—	unknown	23:05–03:55 (marginal, 4.83 h)	87.2° 02:55	4.89	99%	61.8°
2033-07-13 Wed	49	—	unknown	23:00–03:55 (marginal, 4.92 h)	87.2° 02:50	4.93	97%	57.2°
2033-07-14 Thu	54	—	unknown	23:00–00:40 (good, 1.67 h)	87.2° 02:50	4.97	92%	54.7°
2033-07-15 Fri	65	—	unknown	23:00–02:00 (good, 3.0 h)	87.2° 02:45	5.01	84%	54.6°
2033-07-16 Sat	96	—	unknown	23:00–04:00 (good, 5.0 h)	87.2° 02:40	5.06	75%	57.1°
2033-07-17 Sun	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.2° 02:35	5.1	64%	61.7°
2033-07-18 Mon	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.2° 02:35	5.15	53%	67.9°
2033-07-19 Tue	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.2° 02:30	5.19	41%	75.1°
2033-07-20 Wed	100	—	unknown	22:55–04:05 (good, 5.17 h)	87.2° 02:25	5.24	31%	83.0°
2033-07-21 Thu	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.2° 02:20	5.29	21%	90.9°
2033-07-22 Fri	100	—	unknown	22:50–04:10 (good, 5.33 h)	87.2° 02:15	5.34	13%	98.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-06-23&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.