Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: June 23, 2025
It says: 'The squares of the periodic times of the planets are always in the same proportion as the cubes of their mean distances from the sun. In mathematical symbols this reads: t12 / t22 = r13 / r23 We shall see later how Kepler arrived at this law. The point is that there is nothing in it which is not accessible to pure observation.
Word Of The Day
Others Looking