$Sunset or sundown is the daily disappearance of the Sun below the horizon as a result of Earth`s rotation. The Sun will set exactly due west at the equator on the spring and fall equinoxes, each of which occurs only once a year. The time of sunset is defined in astronomy as the moment when the trailing edge of the Sun`s disk disappears below the horizon. Near to the horizon, atmospheric refraction causes the ray path of light from the Sun to be distorted to such an extent that geometrically the Sun`s disk is already about one diameter below the horizon when a sunset is observed.$

sunset at the beach

Format JPG 300 DPI

Image information

Author: dreamstime
License:buy for Personal Use & Commercial
File Type: JPG
Views: times

Comprar

about already and astronomy atmospheric beach below causes daily defined diameter disappearance disappears disk distorted due each earths edge equator equinoxes exactly extent fall from geometrically horizon light moment near observed occurs once one only path ray refraction result rotation set spring such sun sundown suns sunset that time trailing west when which will year