arcsecond
plural of monkey boot
Alternative form of chequy
(physiology) Relating to cryptogenesis / Alternative form of cryptogenic
A unit of angle; 1/60th of an arcminute, or 1/3600th of a degree.
理想的な観測条件下で、観測所の望遠鏡は0.5角秒ほどの構造を識別できた。
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