Changes

Parallax is also used by [[astronomy|astronomers]] to estimate the distance to nearby [[star]]s. A photograph is taken of the star. Six [[month]]s later the [[Earth]] is on the opposite side of the [[Sun]] and a second photograph is taken. This provides a baseline of twice the distance from the Earth to the Sun, i.e. 186 million miles. The change in the apparent position of the star can be used to calculate its distance. The angular displacement of the star, expressed in [[radian]]s is equal to the baseline divided by the distance to the star.

Parallax is also used by [[astronomy|astronomers]] to estimate the distance to nearby [[star]]s. A photograph is taken of the star. Six [[month]]s later the [[Earth]] is on the opposite side of the [[Sun]] and a second photograph is taken. This provides a baseline of twice the distance from the Earth to the Sun, i.e. 186 million miles. The change in the apparent position of the star can be used to calculate its distance. The angular displacement of the star, expressed in [[radian]]s is equal to the baseline divided by the distance to the star.

[[category:astronomy]]

* [[Scope]]

 

[[Category : Firearm Sights]]