ocr: ASTAR CALLED SUN At the equator, the Sun rotates around its axis in 25 days, but at its poles in over 30 days. This is because of differential rotation. The Sun orbits around the centre of the Milky Way in about 225 million years, which equals to one galactic year. Thus, the Sun has a velocity of220 kilometres per second. The surface of the Sun vibrates rhythmically. These vibrations have certain trequencies, just like the keynotes and their overtones in music. This vibration is a result of the inner streams of the Sun. Figures for the Sun: Mass: 1.9891x1030kg l 333,000 fimes the mass of Earth ...
