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The Moon - Week 5 Notes - ASTR 1345

by: Sera

The Moon - Week 5 Notes - ASTR 1345 ASTR 1345-004

Marketplace > University of Texas at Arlington > ASTR 1345-004 > The Moon Week 5 Notes ASTR 1345

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About this Document

These notes are from all lectures over the Moon
Intro to Astronomy 1
James J Davis
Class Notes
moon, themoon, astronomy, astro, space, eclipse, notes, Lecture, ASTR, 1345, astr1345, Davis, lunar
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This 2 page Class Notes was uploaded by Sera on Friday September 30, 2016. The Class Notes belongs to ASTR 1345-004 at University of Texas at Arlington taught by James J Davis in Fall 2016. Since its upload, it has received 11 views.


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Date Created: 09/30/16
Note taker: Sera ASTR 1345 The Moon  Earth’s closest celestial neighbor  Located an average of 385,000 km from Earth  Orbital distance varies by roughly 12%  Does not have a perfectly circular orbit around Earth  Moon is very, very slowly drifting away from us and slowing us down (at a very slow rate)  “Super moon’s” occur when the moon is closest to the Earth and full  The moon is actually a very dark color because of its rocky composition and only reflects about 7% of the light that hits it o The moon would appear considerably more bright if it were made of metal or ice  Moon is ~81 times smaller than the Earth o  Moon is tilted approximately 7 away from the Earth  The Moon’s orbit around Earth is tilted as well o It does not orbit around Earth’s equator o This is part of what makes eclipses so rare  On planets like Jupiter, which has moons that do orbit around the equator, eclipses occur multiple times a week  Apogee – point of furthest distance  Perigee – point of closest distance The Far Side of the Moon  Tidal locking o Earth’s gravity keeps only one side of the Moon facing the Earth o We never see the “far side” of the moon o Moon rotates ~11 miles per hour  “The Dark Side” o Isn’t actually dark o Has a lot more crater impacts, less mare  Lunar nights last 15 Earth days o Lunar rock gets extremely cold during the lunar night and extremely hot during lunar days Lunar Phases  The phases of the moon are due to two effects: o The Moon’s position in its orbit around the Earth o The illumination of the lunar surface by the Sun The Orbit of the Moon  Sidereal period: the time it takes to complete one orbit in relation to the background stars  The Moon travels a complete 360 circle every 27.3days (sidereal period)  Synodic period: the time it takes to return to the same angle in relation with the sun and Earth Note taker: Sera ASTR 1345  Moon takes 29.5 days to complete a synodic cycle  The synodic cycle is longer because the Earth is in motion around the sun while the Moon is trying to realign with the Sun and Earth Eclipses Solar Eclipse  occurs when the Earth falls into the shadow of the Moon o Sun is covered by the Moon Sun Moon Earth  Sometimes an eclipse occurs but the shadow falls above or below the Earth, so we do not get to see it  Only the portion of the Earth which the shadow falls on can see the eclipse  Total solar eclipse – darkest part of the Moon’s shadow falls on the Earth’s surface o Lasts 7 minutes max o Umbra – darkest part of the shadow o Penumbra – partially illuminated part of a shadow  Partial solar eclipse – Only part of the Sun’s disk is covered by the new moon  Annular solar eclipse – Moon’s disk covers most, but not quite all of the sun o Moon is slightly further away than usual and appears smaller  “Diamond ring” – when sunlight breaks through mountains on the moon and shines like a diamond Lunar Eclipse  Occurs when the Moon falls into the shadow of the Earth  Sun-Earth-Moon alignment  Can only occur during a full moon  Moon turns blood red because of the way Earth’s atmosphere scatters light Sun Earth Moon


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