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: 12-01 (100), 12-02 (100), 12-03 (100), 12-04 (100), 12-05 (100) — by astronomy; check the weather when the night is within four days.

2034-12-01astronomy score per night — click a bar for that night2034-12-30

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
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°
2034-12-09 Sat	100	—	unknown	18:35–22:30 (good, 3.92 h)	87.2° 16:10	11.44	1%	86.7°
2034-12-10 Sun	100	—	unknown	18:35–22:25 (good, 3.83 h)	87.2° 16:05	11.45	0%	80.2°
2034-12-11 Mon	99	—	unknown	18:35–22:20 (good, 3.75 h)	87.2° 16:00	11.46	1%	74.0°
2034-12-12 Tue	97	—	unknown	18:35–22:15 (good, 3.67 h)	87.2° 15:55	11.47	4%	68.4°
2034-12-13 Wed	92	—	unknown	18:35–22:10 (good, 3.58 h)	87.2° 15:50	11.48	9%	63.4°
2034-12-14 Thu	86	—	unknown	18:35–22:10 (good, 3.58 h)	87.2° 15:50	11.49	15%	59.6°
2034-12-15 Fri	77	—	unknown	18:35–22:05 (good, 3.5 h)	87.2° 15:45	11.49	22%	57.1°
2034-12-16 Sat	67	—	unknown	18:35–21:50 (good, 3.25 h)	87.2° 15:40	11.5	31%	56.4°
2034-12-17 Sun	57	—	unknown	18:35–21:35 (good, 3.0 h)	87.2° 15:35	11.5	41%	57.6°
2034-12-18 Mon	48	—	unknown	18:35–21:25 (good, 2.83 h)	87.2° 15:30	11.5	52%	60.6°
2034-12-19 Tue	41	—	unknown	18:35–20:25 (good, 1.83 h)	87.2° 15:30	11.51	63%	65.4°
2034-12-20 Wed	37	—	unknown	18:35–19:35 (good, 1.0 h)	87.2° 15:25	11.51	74%	71.7°
2034-12-21 Thu	35	—	unknown	18:35–19:30 (good, 0.92 h)	87.2° 15:20	11.51	83%	79.0°
2034-12-22 Fri	37	—	unknown	18:35–19:45 (good, 1.17 h)	87.2° 15:15	11.51	91%	87.1°
2034-12-23 Sat	40	—	unknown	18:40–20:20 (good, 1.67 h)	87.2° 15:10	11.51	97%	95.4°
2034-12-24 Sun	45	—	unknown	18:40–21:00 (good, 2.33 h)	87.2° 15:10	11.5	100%	103.5°
2034-12-25 Mon	51	—	unknown	18:40–21:05 (good, 2.42 h)	87.2° 15:05	11.5	99%	110.9°
2034-12-26 Tue	56	—	unknown	18:40–21:05 (good, 2.42 h)	87.2° 15:00	11.5	96%	116.9°
2034-12-27 Wed	63	—	unknown	18:40–21:05 (good, 2.42 h)	87.2° 14:55	11.49	91%	121.2°
2034-12-28 Thu	64	—	unknown	18:40–21:05 (good, 2.42 h)	87.2° 14:55	11.48	83%	123.3°
2034-12-29 Fri	62	—	unknown	18:40–21:10 (good, 2.5 h)	87.2° 14:50	11.48	74%	123.2°
2034-12-30 Sat	60	—	unknown	18:40–21:05 (good, 2.42 h)	87.2° 14:45	11.47	65%	121.2°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2034-12-01&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.