Speed of Light

the speed of light = 1.07925285 x 10⁹ kilometers / hour

Speed of light

Sunlight takes about 8 minutes 17 seconds to travel the average distance from the surface of the Sun to the Earth.
Exact values
metres per second	7008299792458000000♠299792458
Planck length per Planck time (i.e., Planck units)	1
Approximate values (to three significant digits)
kilometres per hour	7003108000000000000♠1080 million (7009108000000000000♠1.08×109)
miles per second	7005186000000000000♠186000
miles per hour	671 million (7008671000000000000♠6.71×108)
astronomical units per day	173[Note 1]
Approximate light signal travel times
Distance	Time
one foot	1.0 ns
one metre	3.3 ns
from geostationary orbit to Earth	119 ms
the length of Earth's equator	134 ms
from Moon to Earth	1.3 s
from Sun to Earth (1 AU)	8.3 min
one light year	1.0 year
one parsec	3.26 years
from nearest star to Sun (1.3 pc)	4.2 years
from the nearest galaxy (the Canis Major Dwarf Galaxy) to Earth	7011788940000000000♠25000 years
across the Milky Way	7012315576000000000♠100000 years
from the Andromeda Galaxy to Earth	2.5 million years
from Earth to the edge of the observable universe