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 Triangulum Pinwheel: 02-03 (68), 02-15 (57), 02-16 (56), 02-04 (55), 02-17 (55) — by astronomy; check the weather when the night is within four days.

2044-02-03astronomy score per night — click a bar for that night2044-03-03

night of	astronomy	weather	overall	best window	highest	dark h	Moon	Moon sep.
2044-02-03 Wed	68	—	unknown	19:15–22:35 (good, 3.33 h)	79.2° 17:05	10.7	22%	27.7°
2044-02-04 Thu	55	—	unknown	19:15–22:15 (good, 3.0 h)	79.2° 17:00	10.67	32%	18.4°
2044-02-05 Fri	41	—	unknown	19:20–21:55 (good, 2.58 h)	79.2° 16:55	10.63	43%	16.4°
2044-02-06 Sat	29	—	unknown	19:20–22:45 (marginal, 3.42 h)	79.2° 16:50	10.6	54%	23.9°
2044-02-07 Sun	21	—	unknown	19:20–22:30 (marginal, 3.17 h)	79.2° 16:50	10.56	65%	35.7°
2044-02-08 Mon	20	—	unknown	19:20–22:20 (marginal, 3.0 h)	79.2° 16:45	10.53	76%	48.8°
2044-02-09 Tue	21	—	unknown	19:25–22:15 (marginal, 2.83 h)	79.2° 16:40	10.49	85%	62.5°
2044-02-10 Wed	25	—	unknown	19:25–22:20 (marginal, 2.92 h)	79.2° 16:35	10.45	92%	76.4°
2044-02-11 Thu	33	—	unknown	19:25–20:30 (good, 1.08 h)	79.2° 16:30	10.42	98%	90.4°
2044-02-12 Fri	42	—	unknown	19:25–21:35 (good, 2.17 h)	79.2° 16:30	10.38	100%	104.3°
2044-02-13 Sat	50	—	unknown	19:25–21:45 (good, 2.33 h)	79.2° 16:25	10.34	99%	117.8°
2044-02-14 Sun	51	—	unknown	19:30–21:45 (good, 2.25 h)	79.2° 16:20	10.3	96%	130.9°
2044-02-15 Mon	57	—	unknown	19:30–21:40 (good, 2.17 h)	79.2° 16:15	10.26	92%	143.2°
2044-02-16 Tue	56	—	unknown	19:30–21:45 (good, 2.25 h)	79.2° 16:10	10.22	85%	154.3°
2044-02-17 Wed	55	—	unknown	19:30–21:40 (good, 2.17 h)	79.2° 16:10	10.18	77%	162.4°
2044-02-18 Thu	51	—	unknown	19:35–21:35 (good, 2.0 h)	79.2° 16:05	10.14	68%	163.6°
2044-02-19 Fri	49	—	unknown	19:35–21:35 (good, 2.0 h)	79.2° 16:00	10.1	59%	157.2°
2044-02-20 Sat	48	—	unknown	19:35–21:30 (good, 1.92 h)	79.2° 15:55	10.06	49%	147.7°
2044-02-21 Sun	46	—	unknown	19:35–21:25 (good, 1.83 h)	79.2° 15:55	10.01	40%	137.1°
2044-02-22 Mon	43	—	unknown	19:40–21:20 (good, 1.67 h)	79.2° 15:50	9.97	31%	126.1°
2044-02-23 Tue	41	—	unknown	19:40–21:15 (good, 1.58 h)	79.2° 15:45	9.93	22%	114.8°
2044-02-24 Wed	39	—	unknown	19:40–21:15 (good, 1.58 h)	79.2° 15:40	9.89	15%	103.3°
2044-02-25 Thu	38	—	unknown	19:40–21:10 (good, 1.5 h)	79.2° 15:35	9.84	9%	91.5°
2044-02-26 Fri	36	—	unknown	19:40–21:05 (good, 1.42 h)	79.2° 15:35	9.8	4%	79.5°
2044-02-27 Sat	33	—	unknown	19:45–21:00 (good, 1.25 h)	79.2° 15:30	9.75	1%	67.3°
2044-02-28 Sun	32	—	unknown	19:45–21:00 (good, 1.25 h)	79.2° 15:25	9.71	0%	54.9°
2044-02-29 Mon	30	—	unknown	19:45–20:55 (good, 1.17 h)	79.2° 15:20	9.66	1%	42.5°
2044-03-01 Tue	28	—	unknown	19:45–20:50 (good, 1.08 h)	79.2° 15:15	9.62	5%	30.5°
2044-03-02 Wed	24	—	unknown	19:50–20:40 (good, 0.83 h)	79.2° 15:15	9.57	11%	20.2°
2044-03-03 Thu	20	—	unknown	19:50–20:30 (good, 0.67 h)	79.2° 15:10	9.53	19%	15.8°

Download: CSV · JSON

💡 API

curl -sS "https://devops.majbase.com/rozhen-planner/calendar-api?target=M31&date=2044-02-03&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.