Eclipses. Eclipse Facts An eclipse is a shadow, either on the Earth or on the moonAn eclipse is a shadow, either on the Earth or on the moon.

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Presentation transcript:

Eclipses

Eclipse Facts An eclipse is a shadow, either on the Earth or on the moonAn eclipse is a shadow, either on the Earth or on the moon

Eclipse Facts Umbra- area of a shadow that causes a total eclipse to occurUmbra- area of a shadow that causes a total eclipse to occur Penumbra- area of a shadow that causes a partial eclipse to occurPenumbra- area of a shadow that causes a partial eclipse to occur

Solar Eclipses Moon moves between Earth and Sun Sun gets dark- solar eclipse (2-5 per year) –Moon casts a shadow on part of the Earth Total eclipses rare – only once every 360 years from one location!

When will the next TOTAL SOLAR ECLIPSE happen in North America? August 21 of 2017… Partial for PA Next Total Eclipse April 8 th 2024

Solar Eclipse example

Lunar Eclipse Earth is between the sun and moonEarth is between the sun and moon Moon gets dark-lunar eclipseMoon gets dark-lunar eclipse –Moon moves into Earth’s shadow – this shadow darkens the Moon Umbra Penumbra A lunar eclipse happens at a full moon, when the moon's tilted orbit brings it into the Earth's shadow, which can then be seen cast onto the moon. A lunar eclipse happens at a full moon, when the moon's tilted orbit brings it into the Earth's shadow, which can then be seen cast onto the moon.tilted orbittilted orbit About 2-3 per year Last up to 4 hours

Total Lunar Eclipse February 10 th 2017

Lunar eclipse

Why don’t we see solar and lunar eclipses every month? Moon’s orbit is TILTED! (about 5 degrees relative to the orbit of the earth around the sun) –This tilt is enough to place the moon out of the Earth’s shadow for most full moons and Earth out of the moon’s shadow for most new moons

Eclipse Lab 1. Make two balls out of clay. Earth 4cm in diameter Moon 1 cm in diameter 2. Place the two balls about 15 cm apart. 3. Hold the flashlight about 15 cm away from the larger ball 4. Drawing 1: shine the light on the larger ball and sketch. 5. Drawing 2: Move the light to the opposite side and shine on smaller ball. 6. Answer questions.

15cm apart