The Sun has a period around the galactic center (which is normally taken to be Sgr A*) of T~2.5 x 10^8 years = 250 Myr, meaning it will complete a turn around the galaxy in that time.
The angular speed of the Sun around the gal. center will then be w = 2*pi/T = .025 rad/Myr.
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he discovered that the earth revolved around the sun (heliocentricity) and at that time everyone believed that the sun/planets revolved around the earth (geocentricity)
He believed in a heliocentric universe, or a universe where all of the planets revolve around the sun.
In Heliocentrism, the Sun (Helios) is said to be at the centre of the universe.
That Earth went around the sun.
Earth going around the sun.