An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 4 Search : arcsecond
arcsecond
  ثانیه‌ی ِ کمانی   
sâniye-ye kamâni

Fr.: seconde d'arc   

An angular measurement equal to 1/3600 of a degree or 1/60 of an arcminute. It is denoted by the symbol ''. There are 206,264.5'' in a radian, so that 1'' = 4.848 × 10-6 radians.

arc; → second.

milli-arcsecond (mas)
  میلی ثانیه‌ی ِ کمانی   
mili sâniye-ye kamâni

Fr.: milliseconde d'arc   

A unit of angle equal to one thousandth of an → arcsecond, or 1/3 600 000 degree.

milli-; → arcsecond.

sub-arcsecond
  زیر-ثانیه‌ای   
zir-sâniye-yi

Fr.:   

A measure of angle smaller than 1 arcsecond, usually until 0.1 arcsecond.

sub-; → arc second.

sub-arcsecond imaging
  تصویرگری ِ زیر-ثانیه‌ای   
tasvir-gari-ye zir-sâniye-yi

Fr.:   

Imaging in excellent seeing conditions using an adequate detector to obtain stellar images whose profile lies in the sub-arcsecond range.

sub-arcsecond; → imaging.