Chapter 4- Newton's Law of Universal Gravitation

The inverse square law holds for gravity and for all phenomena wherein the effect from a localized source spreads uniformily throughout the surrounding space:

the electric field about an isolated electron, the light from a match, the radiation a piece of uranium, and the sound of a cricket.

      The Inverse Square Law  

Hewitt Hits Home


The higher the orbit of a satellite,

the less its speed,
the longer its path,
the longer its period.

    So, you want to find the mass of the Earth and the density?
How about the mass of the Sun?

With little to no effort. . .one can sit down and calculate the mass of the Earth, the mass of the Sun, the density of the earth, the mass of Jupiter, the mass of the galaxy and the number of stars in the galaxy.

Tycho Brahe kept the records.

Johannes Kepler made laws out of Brahe's records.

Issac Newton turned it all into universal Laws.

  Finding the Distance to nearby Stars
Transit of Venus 1
Transit of Venus 2