8motions of earth
The Eight Motions of the Earth
1.
Precession of the Earth's Axis
The Earth spins like a top due to the
bulge at the Equator.
This motion takes about 26,000
years to complete.
The North Star will be Vega instead
of Polaris by the year 14,000 AD
2.
Polar Variation
The Earth wobbles causing the location
of the North and South Poles to vary by 3 to 15 m.
This Chandler Wobble causes the latitude
of any position on the Earth to move a few metres in this 14
month
cycle
and affects GPS readings.
3.
Earth's Revolution Around the Sun
30.5km per second
or 110,000 km per hour
4.
The Solar System moving through the Galaxy
20 km per second
or 69,500km per hour
5.
Our Revolution around the center of the Galaxy
250-300 km per second
225 million years to complete 1 revolution
6.
Our Galaxy moving through the Universe
400 km per second
or 1.45 million km per hour
7.
Earth's Rotation on its Axis
The Earth is revolving at 1665 km per
hour (at the equator).
The tides have been slowing this down
by 1/1000 second per year.
The Earth's rotation has slowed down
by 20 in the last 2,000,000 years.
8.
Continental Drift
Australia is moving northward
about 7.5 cm per year.
Australia has drifted northward
1.5m since the arrival of Captain Cook.