The parsec is a unit of astronomical distance. The parsec's definition is rooted in the parallax effect. The parsec is used to measure large-scale astronomical distances. The parallax effect forms the ...

Earth's distance from the sun does not stay the same throughout the year. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. An astronomical unit ...

A parsec is a standard astronomical measurement that is often misunderstood. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A parsec is a unit ...