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Motions of the Eath-Moon System
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The moon revolves around the earth in a 29 1/9 day period = about a month
This is know as the SYNODIC MONTH this however is only the apparent period for the phases of the moon
The moon actually only takes 27 1/3 days to travel around the earth know as the SIDEREAL MONTH
On a side-note
The time it takes the moon to revolve around its own axis is equal to a sidereal month
So.. We are always seeing the same lunar hemisphere
Kid fact: The dark side of the moon is -173'C (-280'F) while the Illuminated side is a toasty 127'C (261'F)
The next visible eclipse in the U.S. will be Agust 21, 2017
The Moon
How they all move
Earth
Earth takes approximately 24 hours = 1 day to rotate around it's axis
Controlling night and day
Earth takes 365 days = 1 year to revolve around the sun
Eclipses
Two kinds of eclipses
Total Eclipses lasts for only 7 minutes
Complete Shadow
Polar regions see a lot of partial eclipses because they are at the very edge of the penumbra when the moons shadow misses the earth
SUN LIGHT
Phases of the Moon
A little bit of light
Lunar Eclipse: Where the earth is directly between the sun and the moon casting a shadow on the moon
Solar Eclipse: when the moon is directly in line with the sun and the earth casting a shadow on the earth
The moon looks red because the earth atmosphere bends the sunlight transmiting long-wavelengths of light that are red
Lasts up to four hours
Visible to any one on that side of the earth
- We have phases because of the motion of the moon and sunlight
- Half the moon is always illuminated even though thats not how we see it
- The phases are our perspective of the moon here on earth
Quiz Questions
- The moon is visible during the day when it is not directly across from the sun
What is a sidereal month?
Why do we have moon phases?
Why dose the moon turn red during a lunar eclipse?
- It only not rises and sets with the sun when it is a full moon