The average distance between the earth and the moon is approximately 238,855 miles (384,400 kilometers).
The distance between the earth and the moon is measured using a unit called the Astronomical Unit (AU). This is defined as the average distance between the earth and the sun, which is approximately 93 million miles (149.6 million kilometers). The distance between the earth and the moon is then calculated using this unit.
No, the distance between the earth and the moon is not constant. The moon's orbit around the earth is not a perfect circle, but rather an ellipse. This means that the distance between the earth and the moon varies throughout the moon's orbit.
Light travels at a speed of approximately 186,282 miles (299,792 kilometers) per second. Therefore, it takes about 1.3 seconds for light to travel from the moon to the earth.
Our understanding of the distance between the earth and the moon has evolved greatly over time. In ancient times, it was believed that the moon was much closer to the earth. It wasn't until the 17th century that scientists were able to calculate a relatively accurate distance using trigonometry and measurements of parallax. With advancements in technology, we are now able to measure the distance with even greater precision.