 Because the Earth is tilted (23.5 degrees)!! (You better not forget this answer!!)  Axis: imaginary line that runs through the center of Earth  (Common.

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Presentation transcript:

 Because the Earth is tilted (23.5 degrees)!! (You better not forget this answer!!)  Axis: imaginary line that runs through the center of Earth  (Common sense): When you are on the part of Earth facing the sun it’s daytime. When Earth is away from the sun it’s night time.

 When you are on the part of Earth that is tilted towards the sun it’s summer.  When you are on the part of Earth tilted away form the sun it’s winter.  NOTE: The entire Northern Hemisphere (top half of Earth) experiences the same season at the same time. Same goes for the Southern Hemisphere.

 Solstice: June 21 and Dec 21. Longest days of the year (June in the Northern Hem and Dec in the Southern Hem).  Equinox: When days and nights are the same length (March 21 and Sept 21). When summer becomes autumn and winter becomes spring.

 Eclipses occur when a large shadow travels across the surface of the Earth.  Umbra- The darker part of the shadow  Penumbra- lighter part of the Shadow  Total Eclipse- Observers on the Earth’s surface who are shadowed by the darker umbra see this  Partial Eclipse- Observers on the Earth’s surface who are shadowed by the Penumba

 When the moon blocks out the sun.  The moon passes between the Earth and sun.  Doesn’t happen often because Earth is tilted.  Only a few people can see

 When Earth’s shadow blocks out the sun.  Sun  Earth  Moon  The moon moves into Earth’s shadow and “disappears.”  &NR=1&feature=fvwp &NR=1&feature=fvwp

 We will come back to this picture at the end.

 A solar eclipse occurs when the moon lies between the sun and the earth, and blocks the view of the sun.

 Occurs when the earth lies between the sun and the moon, and the earth's shadow falls on the moon. Anyone on the side of the Earth that faces the Moon at that time can see such an eclipse.

The revolution of the Moon around the Earth makes the Moon look as if it is changing shape in the sky.

This is caused by the different angles from which we see the lighted part of the Moon's surface. These are called "phases" of the Moon.

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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 Waxing Crescent First quarter Waxing Gibbous Full moon Waning Gibbous Last (3 rd ) quarter moon Waning crescent

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

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.

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.

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.

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.)

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.)

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.)

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.)

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 on_phases.html

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