EVERYDAY SCIENCE

Detailed explanation-1: -It represents the distance at which the radius of Earth’s orbit subtends an angle of one second of arc. Thus, a star at a distance of one parsec would have a parallax of one second, and the distance of an object in parsecs is the reciprocal of its parallax in seconds of arc.

Detailed explanation-2: -The parsec is a unit of length used to measure vast distances between astronomical objects outside the Solar System. It is roughly equivalent to. light-years or astronomical units, or. trillion kilometers.

Detailed explanation-3: -The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to 3.26 light-years or 206, 265 astronomical units (au), i.e. 30.9 trillion kilometres (19.2 trillion miles).

Detailed explanation-4: -Bottom line: One parsec is defined as the distance to a star that shifts by one arcsecond from one side of Earth’s orbit to the other. One parsec is about 30 trillion kilometers, or just over three light-years.

Detailed explanation-5: -A parsec (pc) is the distance at which a length of 1 AU would subtend an angle of exactly 1 second of arc.