ROTATION AND ORBIT

OBBIT: The Earth orbits the Sun at an average distance of 150 million miles, completing a solar orbit every 365.2564 days, or one sidereal year. From Earth, this creates an apparent movement of the Sun eastward moving with respect to the stars at a rate of about 1 ° / day, or a diameter of the Sun or Moon every 12 hours. Because of this motion, on average it takes the Earth 24 hours (one solar day) to complete one rotation on its axis until the sun returns to the meridian. The orbital speed of the Earth is about 29.8 km / s (107,000 km / h), which is fast enough to traverse the diameter of Earth (12,742 km) in seven minutes, or the distance between the Earth and Moon (384,000 km) in four hours.


ROTATION: The rotation period of the Earth from the Sun, ie, a solar day is around 86 400 second solar time (86 400.0025 seconds SIU) .130 The Earth solar day is now slightly longer than it was during the nineteenth century due to tidal acceleration, the days last between 0 and 2 ms SIU's.