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: 12-26 (68), 12-27 (67), 12-28 (65), 12-29 (63), 12-30 (60) — by astronomy; check the weather when the night is within four days.

2035-12-26astronomy score per night — click a bar for that night2036-01-24

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2035-12-26 Wed	68	—	unknown	18:40–21:20 (good, 2.67 h)	87.2° 15:00	11.5	7%	87.8°
2035-12-27 Thu	67	—	unknown	18:40–21:20 (good, 2.67 h)	87.2° 15:00	11.49	3%	81.5°
2035-12-28 Fri	65	—	unknown	18:40–21:15 (good, 2.58 h)	87.2° 14:55	11.49	0%	75.6°
2035-12-29 Sat	63	—	unknown	18:40–21:10 (good, 2.5 h)	87.2° 14:50	11.48	0%	70.2°
2035-12-30 Sun	60	—	unknown	18:40–21:05 (good, 2.42 h)	87.2° 14:45	11.47	2%	65.5°
2035-12-31 Mon	56	—	unknown	18:45–21:00 (good, 2.25 h)	87.2° 14:40	11.46	5%	61.8°
2036-01-01 Tue	53	—	unknown	18:45–21:00 (good, 2.25 h)	87.2° 14:40	11.45	10%	59.4°
2036-01-02 Wed	48	—	unknown	18:45–20:55 (good, 2.17 h)	87.2° 14:35	11.44	16%	58.3°
2036-01-03 Thu	43	—	unknown	18:45–20:40 (good, 1.92 h)	87.2° 14:30	11.43	23%	58.8°
2036-01-04 Fri	37	—	unknown	18:45–20:30 (good, 1.75 h)	87.2° 14:25	11.42	32%	60.8°
2036-01-05 Sat	32	—	unknown	18:45–20:20 (good, 1.58 h)	87.2° 14:20	11.41	42%	64.3°
2036-01-06 Sun	27	—	unknown	18:45–20:10 (good, 1.42 h)	87.2° 14:20	11.39	52%	69.1°
2036-01-07 Mon	23	—	unknown	18:50–19:40 (good, 0.83 h)	87.2° 14:15	11.38	62%	75.0°
2036-01-08 Tue	22	—	unknown	18:50–19:15 (good, 0.42 h)	87.2° 14:10	11.36	73%	81.8°
2036-01-09 Wed	21	—	unknown	18:50–19:15 (good, 0.42 h)	87.2° 14:05	11.35	82%	89.2°
2036-01-10 Thu	22	—	unknown	18:50–19:35 (good, 0.75 h)	87.2° 14:05	11.33	90%	96.8°
2036-01-11 Fri	24	—	unknown	18:50–19:50 (good, 1.0 h)	87.2° 14:00	11.31	96%	104.3°
2036-01-12 Sat	25	—	unknown	18:55–19:55 (good, 1.0 h)	87.2° 13:55	11.29	100%	111.1°
2036-01-13 Sun	27	—	unknown	18:55–19:55 (good, 1.0 h)	87.2° 13:50	11.28	100%	116.7°
2036-01-14 Mon	28	—	unknown	18:55–19:55 (good, 1.0 h)	87.2° 13:45	11.26	97%	120.3°
2036-01-15 Tue	31	—	unknown	18:55–20:00 (good, 1.08 h)	87.2° 13:45	11.23	91%	121.7°
2036-01-16 Wed	30	—	unknown	18:55–20:00 (good, 1.08 h)	87.2° 13:40	11.21	83%	120.7°
2036-01-17 Thu	27	—	unknown	19:00–19:55 (good, 0.92 h)	87.2° 13:35	11.19	74%	117.8°
2036-01-18 Fri	26	—	unknown	19:00–19:50 (good, 0.83 h)	87.2° 13:30	11.17	64%	113.3°
2036-01-19 Sat	25	—	unknown	19:00–19:45 (good, 0.75 h)	87.2° 13:25	11.14	54%	107.9°
2036-01-20 Sun	24	—	unknown	19:00–19:45 (good, 0.75 h)	87.2° 13:25	11.12	43%	101.8°
2036-01-21 Mon	23	—	unknown	19:00–19:40 (good, 0.67 h)	87.2° 13:20	11.09	34%	95.5°
2036-01-22 Tue	21	—	unknown	19:05–19:35 (good, 0.5 h)	87.2° 13:15	11.07	25%	89.2°
2036-01-23 Wed	19	—	unknown	19:05–19:30 (good, 0.42 h)	87.2° 13:10	11.04	17%	82.9°
2036-01-24 Thu	18	—	unknown	19:05–19:30 (good, 0.42 h)	87.2° 13:10	11.01	11%	76.9°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2035-12-26&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.