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: 11-17 (100), 11-18 (100), 11-19 (100), 11-20 (100), 11-21 (100) — by astronomy; check the weather when the night is within four days.

2033-11-17astronomy score per night — click a bar for that night2033-12-16

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2033-11-17 Thu	100	—	unknown	18:40–23:55 (good, 5.25 h)	87.2° 17:35	11.02	15%	117.4°
2033-11-18 Fri	100	—	unknown	18:40–23:50 (good, 5.17 h)	87.2° 17:30	11.05	9%	112.2°
2033-11-19 Sat	100	—	unknown	18:35–23:45 (good, 5.17 h)	87.2° 17:25	11.08	4%	106.3°
2033-11-20 Sun	100	—	unknown	18:35–23:40 (good, 5.08 h)	87.2° 17:20	11.1	1%	99.7°
2033-11-21 Mon	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.2° 17:15	11.13	0%	92.8°
2033-11-22 Tue	100	—	unknown	18:35–23:35 (good, 5.0 h)	87.2° 17:15	11.15	1%	85.7°
2033-11-23 Wed	100	—	unknown	18:35–23:30 (good, 4.92 h)	87.2° 17:10	11.17	4%	78.7°
2033-11-24 Thu	100	—	unknown	18:35–23:25 (good, 4.83 h)	87.2° 17:05	11.2	8%	72.0°
2033-11-25 Fri	98	—	unknown	18:35–23:20 (good, 4.75 h)	87.2° 17:00	11.22	14%	65.8°
2033-11-26 Sat	92	—	unknown	18:35–23:20 (good, 4.75 h)	87.2° 17:00	11.24	22%	60.6°
2033-11-27 Sun	87	—	unknown	18:35–23:15 (good, 4.67 h)	87.2° 16:55	11.26	32%	56.8°
2033-11-28 Mon	79	—	unknown	18:35–22:55 (good, 4.33 h)	87.2° 16:50	11.28	42%	54.8°
2033-11-29 Tue	65	—	unknown	18:35–22:40 (good, 4.08 h)	87.2° 16:45	11.3	53%	55.1°
2033-11-30 Wed	53	—	unknown	18:35–21:15 (good, 2.67 h)	87.2° 16:40	11.32	64%	57.7°
2033-12-01 Thu	46	—	unknown	18:35–19:55 (good, 1.33 h)	87.2° 16:40	11.34	75%	62.4°
2033-12-02 Fri	43	—	unknown	18:35–19:35 (good, 1.0 h)	87.2° 16:35	11.35	84%	68.8°
2033-12-03 Sat	45	—	unknown	18:35–19:45 (good, 1.17 h)	87.2° 16:30	11.37	92%	76.5°
2033-12-04 Sun	50	—	unknown	18:35–20:25 (good, 1.83 h)	87.2° 16:25	11.38	97%	84.8°
2033-12-05 Mon	59	—	unknown	18:35–21:10 (good, 2.58 h)	87.2° 16:20	11.4	100%	93.3°
2033-12-06 Tue	69	—	unknown	18:35–22:05 (good, 3.5 h)	87.2° 16:20	11.41	99%	101.6°
2033-12-07 Wed	79	—	unknown	18:35–22:10 (good, 3.58 h)	87.2° 16:15	11.42	96%	109.2°
2033-12-08 Thu	95	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 16:10	11.44	91%	115.7°
2033-12-09 Fri	98	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 16:05	11.45	84%	120.7°
2033-12-10 Sat	99	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 16:05	11.46	76%	123.9°
2033-12-11 Sun	98	—	unknown	18:35–22:20 (good, 3.75 h)	87.2° 16:00	11.47	66%	125.2°
2033-12-12 Mon	97	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 15:55	11.47	57%	124.6°
2033-12-13 Tue	95	—	unknown	18:35–22:10 (good, 3.58 h)	87.2° 15:50	11.48	47%	122.3°
2033-12-14 Wed	93	—	unknown	18:35–22:05 (good, 3.5 h)	87.2° 15:45	11.49	38%	118.6°
2033-12-15 Thu	91	—	unknown	18:35–22:05 (good, 3.5 h)	87.2° 15:45	11.49	29%	113.7°
2033-12-16 Fri	89	—	unknown	18:35–22:00 (good, 3.42 h)	87.2° 15:40	11.5	21%	108.0°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2033-11-17&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.