相關字詞組
最近查詢過的單字

天火字典

英英字典: right_ascension

right ascension   (TTS Sound)



Overview of noun right_ascension

The noun right ascension has 1 sense


  • right ascension, RA, celestial longitude -- ((astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees")

返回 →