Challenge 9 – Lunar Shadow Size on Earth’s Surface

The center-to-center distance between Earth and moon is 372,027 kilometers, and the distance of the vertex of the shadow cone from the center of the moon is 377,700 km. That means that the vertex lies below the daytime surface of Earth and stretches 377,700 – 372,027 = 5673 km beyond the center of Earth. It is also 705 km below the surface of Earth diametrically opposite the daytime position of totality.