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# (8.7A) Day one

Unit 4 (Earth and Moon Cycles)
by

## Joshua Kavanagh

on 31 October 2012

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#### Transcript of (8.7A) Day one

The student is expected to model and illustrate how the tilted Earth rotates on its axis, causing day and night, and revolves around the Sun causing changes in seasons. Please sit down, and
quietly begin working

(you will have 5 min) We are starting a new Unit.

Unit 4 is all about the Earth and
Moon Cycles.

We are going to work on today's concept
for two class periods. Lets take a look at......
and
a tennis ball What do you think they could represent? TEKS (8.7A) Earth and Moon ? So what causes the Earth
to spin?
AKA, What causes the Earth's
Rotation? Does the Earth's rotation
cause some Force that we have

You should be familiar with it... The ? Effect C oriolis What does it do? Causes the wind of the Earth
to move in a curved path. There are 4 primary questions
that we need to be able to answer... 1. What is the Earth's axis? 2. What is the difference between
the Earth's rotation and revolution? 3. What causes day and night? 4. What causes the seasons? Pre-Assessment Progress-Monitoring Assessment Now its time for
a preliminary card-sort... a. The Earth revolves around the Sun once every 365 ¼ days, which is equal to 1 year on Earth. Revolution… c. Earth’s rotation results in…
day and night
sunrise and sunset. Rotation… a. The Earth rotates on its axis once every 24 hours.
b. The direction of rotation direction is counterclockwise (west to east) if you are viewing Earth from above the North Pole. Rotation… c. The average distance from the Earth to the Sun is called an astronomical unit (AU). This is about 150,000,000 kilometers. Revolution… b. The path around the Sun, or orbit, is not a circle.
The shortest distance between the Earth and Sun is about 147,000,000 km and occurs in January.
The furthest distance between the Earth and Sun is about 152,000,000 km and occurs in July. Revolution… a. The Earth rotates around an axis.
b. The rotational axis is tilted to 23.5°.
c. The Earth revolves around the Sun. The Earth in Space… TEKS 8.7A model and illustrate how the tilted Earth rotates on its axis, causing day and night, and revolves around the Sun causing changes in seasons Rotation and Revolution Notes c. March 21-23 Spring Equinox and September 21-23 Fall Equinox

Earth is not tilted toward or away from the Sun. Each hemisphere receives similar amounts of radiant energy.

The length of daylight and nighttime hours are equal. a. June 21, 22: Summer Solstice
The Sun reaches its highest point in the sky.
The length of daylight hours are the longest. Points in Earth’s orbit around the Sun… c. The hemisphere tilted away from the Sun receives less radiant energy. This season is winter. Reasons for the Seasons… b. The hemisphere tilted toward the Sun receives more direct radiation. This season is summer. Reasons for the Seasons… a. The 23.5°tilt of the Earth on its axis. Reasons for the Seasons… TEKS 8.7A model and illustrate how the tilted Earth rotates on its axis, causing day and night, and revolves around the Sun causing changes in seasons Solving Seasons Notes b. December 21, 22: Winter Solstice
The Sun reaches its highest point in the sky.
The length of daylight hours are the shortest. Points in Earth’s orbit around the Sun… Key Concept 1:
The axis is the center of rotation
of Earth. Earth has a measurable tilt
of 23.5 degrees on its axis. Key Concept 2:
As Earth rotates on a 24-hour schedule,
its east and west hemispheres alternate
facing the Sun causing day and night. Key Concept 3:
As Earth revolves around the Sun in its orbital path, it rotates on its axis and is tilted toward or leaning away from the Sun.This causes change in day length and to the angle of the sun’s rays that strike the Earth’s surface. Regions at different distances from the equator receive varied amounts of sunlight, resulting in the seasons experienced in the two hemispheres. Standards Based - Assessment
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