By using the triangulation method
The mathematical equation which describes how to measure the distance from Earth to the moon using Earth's diameter as a unit of measure is d = Dcot(p/2)/2 Where d is the distance from Earth to the moon, D is the diameter of the Earth and p is the angle of parallax subtended at moon by the diameter of the Earth.
Laser
There are a few methods that one could use to measure the distance between the moon and the earth. The easiest one that I can think of is this: Place a mirror on the moon, shine a laser on it and time how long it takes for the light from the laser to the moon and back again. Take this number and multiply by the speed of light Actually, NASA did exactly this on the Apollo 11 mission! Before Neil Armstrong & co. departed from the moon, they left a mirror there. To this day, scientists can point a laser and a telescope at the moon, and aim the laser at these mirrors, in order to accurately measure the distance between the earth and the moon! Another method that you can use is to measure the angles to the moon from two different cities on the surface of the earth at the same time. By using similar triangles, you can compute the distance to the moon. Mind you, this requires EXTREMELY accurate measurement techniques.
Lunar Laser Ranging experiment. See related link.
The distance to the moon is about 1.3 light seconds or about 0.000000032 light years.
nobody
Laser light.
Not even close to a light year. Light years are used to measure interstellar and intergalactic distance. Distances within the solar system are much smaller. Since the moon orbits Earth, it is about the same distance from the sun as Earth is, give or take about 0.25%. That distances averages 1 astronomical unit, which is about 8 light minutes or 0.000016 light years.
The distance from the Moon to Earth is a little more than one light-SECOND, meaning it takes light a little over a second to travel that distance.
The average distance from the Earth to the Moon is 384,400 km retroreflectors have been placed on the moon and used to measure the distance by timing a pulse of light. the round trip time is about 2.5 seconds so a one way trip takes light about 1.25 seconds
a coin
At its average distance from the earth, the moon is 1.28 light seconds away.