right ascension
right ascension — 片語
1. the astronomy value that shows how far east a star, planet, or other object lies
赤經
天體在赤道上的東向位置
the astronomy value that shows how far east a star, planet, or other object lies on the sky's equator from the vernal equinox, usually written as an hour-minute-second reading
During class, Lakan copied the moon's right ascension from the sky chart.
上課時，Lakan 從星圖上抄下月球的赤經。
copy right ascension from a sky chart
The app showed Mars's right ascension in hours and minutes for tonight.
這個應用程式顯示今晚火星的赤經，並用時和分表示。
right ascension in hours and minutes
Before dawn, Amelia checked Sirius's right ascension on the observatory screen.
天亮前，Amelia 在天文台螢幕上查看天狼星的赤經。
Zayd used right ascension and declination to aim the telescope at Vega.
Zayd 用赤經和赤緯把望遠鏡對準了織女星。
In the guide, the star's right ascension was printed beside a small sky map.
那本指南把這顆星的赤經印在一張小星圖旁邊。
- RA
the standard short form used in star charts, software, and observation notes
- sky longitude
a loose teaching comparison, not the strict technical term used by astronomers
文法句型
the right ascension of + celestial body
measure right ascension in + hours
right ascension and declination
用法筆記
Usually appears with declination when someone gives a sky position. In astronomy tables, it is commonly recorded in hours, minutes, and seconds rather than in degrees.