ECLIPSES

An eclipse is when an astronomical body (such as the Earth and the moon) covers another body using its shadow or the body moves into the shadow.

SHADOWS

• For a lunar eclipse, there are two shadows, the umbra and the penumbra. During a lunar eclipse, the umbra is the dark shadow in the center. The umbra gets smaller as it reaches Earth.

SHADOWS PT. 2

• The penumbra is the lighter shadow that gets larger as it reaches Earth. The same thing is with the solar eclipses, unless it is an Annular Solar Eclipse, which in that case, will create another shadow called the antumbra. It extends from the umbra, but is similar to the penumbra.

OCCURANCE

• Eclipses do not happen every month. The reason for this is because of the orbit of the moon is not together with the Earth’s orbit around the Sun. It's tilted 5.1 degrees. Since the Moon is so far away from the Earth, 5.1 degrees is a lot, so the eclipses are heavily affected in this way.

Lunar Eclipse

LUNAR ECLIPSE

• Moon is directly behind Earth
• Lined up straight with Sun, Earth and the moon
• Earth's shadow (umbra) completely covers moon

PARTIAL LUNAR

• Moon directly behind Earth
• Moon, Sun and Earth are NOT a aligned perfectly
• Part of moon is covered by Earth's darkest shadow
• Need a full moon
• Forms when a full moon is near a lunar node

Solar Eclipse

SOLAR ECLIPSES

• Moon gets between Earth and Sun
• All three are lined up perfectly
• Rare to occur because the tilt needs to line up with Sun
• Only with a new moon

PARTIAL SOLAR

• Moon gets between Sun and Earth
• Not aligned perfectly
• Moon partially covers Sun's disc
• Need a new moon
• New moon near the lunar nodes

WHEN

• There'll be 4 eclipses in 2017
• Solar eclipse- 8/21 & 2/26
• Lunar eclipse- 2/11 & 8/7
• We won't see the Annular, Partial, and total eclipse in Dallas because we are not in range
• We'll be in range for penumbral eclipse, but we will not be in the optimal zone

JESSICA
question #1,2,3,6
KAITLIN
question #4,5
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