How we measure Mass and Radius of earth?
*** How is the mass of Earth measured? The masses of planetary bodies are usually measured by analyzing the effects of gravity. For example, the period of a moon’s orbit about a planet depends on the distance between them and on the masses of the bodies. So learning the period of an orbit lets us make very good approximations of the mass of the objects involved, assuming we can also measure the distance between them. Since we live on the Earth and can easily make Earth-based observations, we can also use the known acceleration due to gravity at the surface of the Earth to calculate the Earth’s mass, since we know the Earth’s radiconsiderablyably easier to directly measure than its mass). http://www.enchantedlearning.com/subject… *** How is the radius measured? At sunset, measure the amount of time between which the Sun appears to set from the ground level and from the height of you
