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: 11-09 (100), 11-10 (100), 11-11 (100), 11-12 (100), 11-13 (100) — by astronomy; check the weather when the night is within four days.

2034-11-09astronomy score per night — click a bar for that night2034-12-08

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2034-11-09 Thu	100	—	unknown	18:45–00:25 (good, 5.67 h)	87.2° 18:05	10.78	1%	104.5°
2034-11-10 Fri	100	—	unknown	18:45–00:20 (good, 5.58 h)	87.2° 18:00	10.81	0%	98.2°
2034-11-11 Sat	100	—	unknown	18:45–00:20 (good, 5.58 h)	87.2° 18:00	10.84	1%	91.6°
2034-11-12 Sun	100	—	unknown	18:40–00:15 (good, 5.58 h)	87.2° 17:55	10.87	3%	85.1°
2034-11-13 Mon	100	—	unknown	18:40–00:10 (good, 5.5 h)	87.2° 17:50	10.9	7%	78.6°
2034-11-14 Tue	100	—	unknown	18:40–00:05 (good, 5.42 h)	87.2° 17:45	10.93	13%	72.5°
2034-11-15 Wed	99	—	unknown	18:40–00:00 (good, 5.33 h)	87.2° 17:40	10.96	20%	67.0°
2034-11-16 Thu	93	—	unknown	18:40–00:00 (good, 5.33 h)	87.2° 17:40	10.99	28%	62.2°
2034-11-17 Fri	86	—	unknown	18:40–23:55 (good, 5.25 h)	87.2° 17:35	11.02	38%	58.6°
2034-11-18 Sat	79	—	unknown	18:40–23:50 (good, 5.17 h)	87.2° 17:30	11.04	47%	56.5°
2034-11-19 Sun	71	—	unknown	18:35–23:20 (good, 4.75 h)	87.2° 17:25	11.07	58%	56.2°
2034-11-20 Mon	59	—	unknown	18:35–21:50 (good, 3.25 h)	87.2° 17:20	11.1	68%	58.0°
2034-11-21 Tue	52	—	unknown	18:35–20:20 (good, 1.75 h)	87.2° 17:20	11.12	78%	61.8°
2034-11-22 Wed	49	—	unknown	18:35–19:45 (good, 1.17 h)	87.2° 17:15	11.15	87%	67.4°
2034-11-23 Thu	50	—	unknown	18:35–20:10 (good, 1.58 h)	87.2° 17:10	11.17	94%	74.4°
2034-11-24 Fri	57	—	unknown	18:35–20:45 (good, 2.17 h)	87.2° 17:05	11.19	98%	82.4°
2034-11-25 Sat	68	—	unknown	18:35–21:35 (good, 3.0 h)	87.2° 17:05	11.21	100%	90.8°
2034-11-26 Sun	80	—	unknown	18:35–22:30 (good, 3.92 h)	87.2° 17:00	11.24	98%	99.2°
2034-11-27 Mon	100	—	unknown	18:35–22:50 (good, 4.25 h)	87.2° 16:55	11.26	94%	107.1°
2034-11-28 Tue	100	—	unknown	18:35–22:55 (good, 4.33 h)	87.2° 16:50	11.28	87%	113.9°
2034-11-29 Wed	100	—	unknown	18:35–22:55 (good, 4.33 h)	87.2° 16:45	11.3	78%	119.2°
2034-11-30 Thu	100	—	unknown	18:35–22:55 (good, 4.33 h)	87.2° 16:45	11.31	68%	122.5°
2034-12-01 Fri	100	—	unknown	18:35–23:00 (good, 4.42 h)	87.2° 16:40	11.33	58%	123.8°
2034-12-02 Sat	100	—	unknown	18:35–22:55 (good, 4.33 h)	87.2° 16:35	11.35	48%	123.0°
2034-12-03 Sun	100	—	unknown	18:35–22:50 (good, 4.25 h)	87.2° 16:30	11.36	38%	120.5°
2034-12-04 Mon	100	—	unknown	18:35–22:45 (good, 4.17 h)	87.2° 16:25	11.38	28%	116.6°
2034-12-05 Tue	100	—	unknown	18:35–22:45 (good, 4.17 h)	87.2° 16:25	11.39	20%	111.6°
2034-12-06 Wed	100	—	unknown	18:35–22:40 (good, 4.08 h)	87.2° 16:20	11.41	13%	105.9°
2034-12-07 Thu	100	—	unknown	18:35–22:35 (good, 4.0 h)	87.2° 16:15	11.42	8%	99.7°
2034-12-08 Fri	100	—	unknown	18:35–22:30 (good, 3.92 h)	87.2° 16:10	11.43	3%	93.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-11-09&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.