Transcript topic 4 earth`s motions

Earths Motions
Objectives:
To describe the motions of the earth in terms of rotation
and revolution.
To understand the apparent motions of celestial objects
as they relate to the earth.
TOPIC 4
EARTH’S MOTIONS
ROTATION-
ROTATIONAL VELOCITY- rate of spin,
EVIDENCE OF ROTATION
FOUCAULT PENDULUMCORIOLIS EFFECT-
Northern hemisphereSouthern hemisphereSEE REFERENCE TABLE PG. 4- OCEAN CURRENTS
PG 14- WIND PATTERNS
Earth rotation
Focault Pendulum-evidence of rotation
See movie
Coriolis effect
See movie
Fast Facts
At the North Pole (90 degrees north) and South Pole (90
degrees south), the speed is effectively zero since that spot
rotates once in 24 hours, a very, very slow speed.
For other latitudes...10° - 1021.7837 mph (1644.4
km/h) 20° - 974.9747 mph (1569.1 km/h) 30° 898.54154 mph (1446.1 km/h) 40° - 794.80665 mph
(1279.1 km/h) 50° - 666.92197 mph (1073.3
km/h) 60° - 518.7732 mph (834.9 km/h) 70° 354.86177 mph (571.1 km/h) 80° - 180.16804 mph
(289.95 km/h)
In addition to the rotational speed of the earth spinning
on its axis, the earth is also speeding at about 66,660
miles per hour (107278.87 km/h) in its revolution around
the sun once ever 365.2425 days.
Turn and Talk to your neighbor.
Answer the following questions.
1.What direction does the earth rotate?
2.How fast does the earth rotate?
3.What are 2 evidences of the earths rotation?
4.Which way do ocean currents and wind patterns
deflect in the Northern Hemisphere?
EARTHS ROTATION CAUSES:
The sun, moon, planets and stars to appear to –
The apparent diameter (size) of the planets, sun and
moon is –
In the summer the sun appears smaller because we
are -.
Apparent diameter of stars will remain constant, -
REVOLUTION
Earths revolution around the sun is –
The eccentric orbit causes the apparent diameter of the sun
to -.
The moon’s revolution around the earth, causes -
The revolution of earth around the
sun-
Revolution of moon around earth
-
Turn and talk
• Answer the questions.
• 1. What does the revolution of the earth
around the sun cause?
• 2. What does the revolution of the earth
around the moon cause?
Geocentric Model-Earth Centered
Heliocentric Model-Sun Centered
Earth is stationary
Earth rotates and revolves
All objects revolve around earth in
perfect circles
Slightly elliptical orbits
Too complex-could not explain some
motions of celestial objects
Could not explain motions
of outer planetsretrograde motion
Easier model, less complex
Could explain terrestrial motions
(rotation, revolution) and motions
of planets- retrograde motion
Turn and Talk:
Describe the differences between the helio
and geocentric models.
Use diagrams to illustrate your findings.
Why was the geocentric model replaced with
the heliocentric model?