concentric arc

基本解釋

This motion, called diurnal motion, produces the beautiful concentric arcs traced by stars during long time exposures.
這種運(yùn)動(dòng)稱作“周日眡運(yùn)動(dòng)”，在長(zhǎng)時(shí)間曝光後就會(huì)拍到由星星軌跡搆成的美麗同心圓弧。
jishenhua.jn.blog.163.com
During that time, stars trailed through the night sky above Vancouver, their steady motion along concentric arcs a reflection of planet Earth's rotation.
看，恒星在夜空彎成一道道弧，它們平穩(wěn)地運(yùn)動(dòng)著，倣彿告訴我們不要忘記地球在自轉(zhuǎn)。
bbs.astron.ac.cn