<P> The galactic year , also known as a cosmic year , is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy . Estimates of the length of one orbit range from 225 to 250 million terrestrial years . The Solar System is traveling at an average speed of 828,000 km / h ( 230 km / s ) or 514,000 mph ( 143 mi / s ) within its trajectory around the galactic center , a speed at which an object could circumnavigate the Earth 's equator in 2 minutes and 54 seconds ; that speed corresponds to approximately one 1300th of the speed of light . </P>
<P> The galactic year , also known as a cosmic year , is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy . Estimates of the length of one orbit range from 225 to 250 million terrestrial years . The Solar System is traveling at an average speed of 828,000 km / h ( 230 km / s ) or 514,000 mph ( 143 mi / s ) within its trajectory around the galactic center , a speed at which an object could circumnavigate the Earth 's equator in 2 minutes and 54 seconds ; that speed corresponds to approximately one 1300th of the speed of light . </P>
how long for sun to rotate around galaxy
how long for sun to rotate around galaxy
225 to 250 million terrestrial years
225 to 250 million terrestrial years