How to calculate mass of the sun? Please tell in a simple methamatical way.
You can calculate the mass of the Sun from Newton's form of Kepler's 3rd law.
Newton's form of Kepler's 3rd law describes the orbit of a planet around the Sun. It relates the semi major axis distance of the orbit to the period of the orbit using the equation:
p is the orbital period;
G is the gravitation constant;
M is the mass of the Sun;
a is the orbit semi major axis distance.
Rearranging the equation gives:
Now for planet Earth:
Putting the values into the equation gives the mass of the Sun: