A brief history of the gravitational constant G is made and the current
value is given. G for the Earth is calculated at perihelion and
aphelion, resulting in different values. G is variable on a revolution
in all cosmic bodies. Variable G is calculated for the solar system. The
physical consequences with variable G are explained, which are valid for
all cosmic bodies. Measurements of G are suggested to be made on Earth
at perihelion and aphelion, on the International Space Station, and on
the Moon.