The speed of light in a vacuum is approximately 299,792 kilometers per second (km/s) or about 186,282 miles per second (mi/s). To calculate the time it takes for light from the Moon to reach Earth, we need to consider the distance between the Moon and Earth.
Let's assume the average distance from the Moon to Earth is about 384,400 kilometers (km), and the distance from the Sun to Earth is approximately 150 million kilometers (km).
Since the Sun is almost 400 times farther from Earth than the Moon, we can calculate the distance from the Sun to Earth as follows:
Distance from the Sun to Earth = 400 * Distance from the Moon to Earth
Distance from the Sun to Earth = 400 * 384,400 km
Distance from the Sun to Earth = 153,760,000 km
Now, we can calculate the time it takes for light from the Moon to reach Earth:
Time = Distance / Speed of light
Time = 384,400 km / 299,792 km/s
Time ≈ 1.282 seconds
Therefore, light from the Moon takes approximately 1.282 seconds to reach Earth.