The Big Idea  Students will understand that the appearance of the moon changes in a predictable cycle as it orbits Earth and as Earth rotates on its.

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Presentation transcript:

The Big Idea  Students will understand that the appearance of the moon changes in a predictable cycle as it orbits Earth and as Earth rotates on its axis.

Objective 1: Explain patterns of changes in the appearance of the moon as it orbits Earth.  Describe changes in the appearance of the moon during a month.  Identify the pattern of change in the moon’s appearance  Use observable evidence to explain the movement of the moon around Earth in relationship to Earth turning on its axis and the position of the moon changing in the sky.  Design an investigation, construct a chart, and collect data depicting the phases of the moon

Objective 2: Demonstrate how the relative positions of Earth, the moon, and the sun create the appearance of the moon’s phases.  Identify the difference between the motion of an object rotating on its axis and an object revolving in orbit.  Compare how objects in the sky (the moon, planets, stars) change in relative position over the course of the day or night.  Model the movement and relative positions of Earth, the moon, and the sun.

Describe changes in the appearance of the moon during a month.  The moon is lit by sunlight bouncing off it. That light reaches Earth as moonlight.  During a 1 month period you will see that the moon’s shape appears to change, and that the time of night or day that you can see the moon also changes.

Describe changes in the appearance of the moon during a month.  The different shapes that the moon appears to have are called the moon’s phases.  The moon goes through eight phases as it revolves around Earth approximately once every 29 days.

Describe changes in the appearance of the moon during a month.  The phases that you see depends on how much of the sunlit part of the moon you can see.  The lit part you can see depends on the positions of Earth, moon, and sun.

FULL QUARTER CRESCENT GIBBOUS FOUR MAIN SHAPES

The Moon passes through four major shapes during a cycle that repeats itself every 29.5 days. The phases always follow one another in the same order: New moon First quarter Third quarter Full moon

New Moon The lighted side of the Moon faces away from the Earth. This means that the Sun, Earth, and Moon are almost in a straight line, with the Moon in between the Sun and the Earth. The Moon that we see looks very dark

New Moon

First Quarter Moon The right half of the Moon appears lighted and the left side of the Moon appears dark. During the time between the New Moon and the First Quarter Moon, the part of the Moon that appears lighted gets larger and larger every day, and will continue to grow until the Full Moon.

First Quarter Moon

Third (Last) Quarter Moon Sometimes called Third Quarter. The left half of the Moon appears lighted, and the right side of the Moon appears dark. During the time between the Full Moon and the Last Quarter Moon, the part of the Moon that appears lighted gets smaller and smaller every day. It will continue to shrink until the New Moon, when the cycle starts all over again.

Third Quarter Moon

Full Moon The lighted side of the Moon faces the Earth. This means that the Earth, Sun, and Moon are nearly in a straight line, with the Earth in the middle. The Moon that we see is very bright from the sunlight reflecting off it.

Full Moon

There are also four other phases of the Moon sometimes used.

Waxing Crescent Moon This Moon can be seen after the New Moon, but before the First Quarter Moon. The crescent will grow larger and larger every day, until the Moon looks like the First Quarter Moon. ("Waxing" means increasing, or growing larger.)

Waxing Crescent Moon

Waxing Gibbous Moon This Moon can be seen after the First Quarter Moon, but before the Full Moon. The amount of the Moon that we can see will grow larger and larger every day. ("Waxing" means increasing, or growing larger.)

Waxing Gibbous Moon

Waning Gibbous Moon This Moon can be seen after the Full Moon, but before the Last Quarter Moon. The amount of the Moon that we can see will grow smaller and smaller every day. ("Waning" means decreasing, or growing smaller.)

Waning Gibbous Moon

Waning Crescent Moon This Moon can be seen after the Last Quarter Moon and before the New Moon. The crescent will grow smaller and smaller every day, until the Moon looks like the New Moon. ("Waning" means decreasing, or growing smaller.)

Waning Crescent Moon

Waxing & Waning

Moon Movie The movie is an animated GIF created by Antonio Cidadao from a sequence of still images taken during March and April Copyright Antonio Cidadao.Antonio Cidadao

It’s Just a Phase  Moonlight is reflected sunlight  Half the moon’s surface is always reflecting light  From Earth we see different amounts of the Moon’s lit surface  The amount seen is called a “phase”

Waxing and Waning  New moon  Waxing Crescent moon  First Quarter moon  Waxing Gibbous moon  Full moon  Waning Gibbous moon  Third Quarter moon  Waning Crescent moon  New moon

MOON QUIZ!! solar_system_level2/moonlight.html