Rotation & Revolution

How does the movement of the sun, earth, and moon relate to days, lunar cycles, and years?

Orbit – the path the earth takes to travel

around the sun.

sun

orbit

ROTATION

Rotation – the Earth spinning on its axis.

earth

Period of Rotation –The amount of time it takes

for this rotation to happen: one day (24

hours)!

Rotation A=Axis

REVOLUTION

Revolution - the motion of the Earth orbiting around

the sun.

• sunearth

Period of Revolution – the amount of time it takes for an object to orbit around the sun once: One year (365 Days).

sun earth

Every planet revolves around the Sun! The closer you get to the sun the shorter the revolution/orbit.

Longer years

Shorter years

Rotation/Revolution Animation:

http://esminfo.prenhall.com/science/geoanimations/animations/01_EarthSun_E2.html

Revolution

Review QUESTIONS:

What does each letter represent?

• earth

sunsun

A

B

C

Rotation or Revolution?

Rotation or Revolution?

Rotation or Revolution?

SOLAR & Lunar ECLIPSE

Objective: What is the difference between a solar and a lunar eclipse?

South Pole

North Pole

Solar Eclipse Details

Sun Moon

A solar eclipse occurs when the moon comes between the Earth and the sun.

MMS= Moon Middle Solar

Partial Solar Eclipse

• The moon passes between Earth and the Sun. The moon covers part of the sun.

Total Solar Eclipse

• Moon passes directly between Earth and the Sun. Moon blocks our view of the Sun. Only the Sun’s corona is visible.

Annular Solar Eclipse

• Moon passes directly between Earth and the Sun. The moon appears smaller than in a total eclipse because it is further from the earth.

LUNAR ECLIPSE

A Lunar Eclipse

Moon

Sun

Earth

Moon’s Path

During a Lunar Eclipse the Earth’s shadow falls on the moon and the moon can look RED!!!

The moon becomes a blood red color during a total lunar eclipse. No wonder that ancient cultures feared the appearance of the moon during a lunar eclipse.

Review Questions:

Answer

What type of eclipse?

• Earth’s axis goes directly through _______.

a. The north and south poles

b. The sun

c. The common center of mass

• When we watch the sun rise and set we are actually experiencing Earth’s ____.

a. Rotation on its axis

b. Revolution around the sun

c. Revolution around the moon

• Fewer people can see total solar eclipses than lunar eclipses because

A) the Moon casts a smaller shadow than Earth does

B) solar eclipses almost never happenC) only people at the South Pole can see

solar eclipses

• When Earth is directly in between the Sun and the Moon, people on Earth experience a __________.

A) lunar eclipse

B) solar eclipse

C) half Moon

• When the Moon is directly in between the Sun and Earth, some people on Earth may experience a __________.

A) solstice

B) lunar eclipse

C) solar eclipse

• A lunar eclipse occurs when ___.

A) the Sun passes into the Earth’s shadow

B) the Earth passes into the Moon’s shadow C) the Moon passes into Earth’s shadow

D) the Moon passes into the Sun’s shadow

• When a lunar eclipse occurs what happens to the Moon?

A) It vanishes from existence, to be recalled on the whim of a magician.

B) It is covered in shadow and hidden from view for a brief time.

C) It becomes extraordinarily bright.D) Nothing happens to it.

• When a solar eclipse occurs, what happens to the Moon?

A) It falls into the Earth’s shadow.

B) It moves between the Earth and the Sun, causing a part of the Earth to fall into its shadow.

C) It lies outside of a straight line connecting the Earth and Sun.

D) It disappears from view.