For every action, there is an equal and opposite reaction
Law of Interaction
The ratio of displacement and time
Law of Period
States that the square of the period of the revolution of a planet about the sun is proportional to the cube of semi minor axis of the planers elliptical orbit
TychoBrahe
Build an observatory and name it "castle of the stars"
FrictionalForce
The resistance made by the other object in response yi action made by the object
parallax
The apparent shift in location if the stars in the sky
KepherJohannes
Proposed the idea that planet are not moving in perfect circle but in elliptical orbit