Noun
milliarcsecond (plural milliarcseconds)
(metrology) A unit of angle equal to one thousandth of an arcsecond (used especially in astronomy)
A milliarcsecond is about the size of a dime atop the Eiffel Tower as seen from New York City. Source: Internet
In the 1980s, charge-coupled devices (CCDs) replaced photographic plates and reduced optical uncertainties to one milliarcsecond. Source: Internet
This is a CHARA interferometer image with 1 2 -milliarcsecond resolution in the near-infrared H-band. Source: Internet