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Earth, Moon and Sun The Earth Earth, Moon and Sun The Earth

Earth, Moon and Sun The Earth - PowerPoint Presentation

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Uploaded On 2018-11-13

Earth, Moon and Sun The Earth - PPT Presentation

Tilted on an axis NS pole 235 degrees Earth moves in space two major ways Rotation spinning of Earth on its axis West to East 15 degrees per hour or once per day counterclockwise This causes day and nighthalf the Earth is always lit and have it always dark ID: 728960

earth moon eclipse sun moon earth sun eclipse lunar side tides high day total occur illuminated tide rise solar

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Slide1

Earth, Moon and Sun

The EarthTilted on an axis (N-S pole) 23.5 degreesEarth moves in space two major waysRotation- spinning of Earth on its axisWest to East, 15 degrees per hour or once per day, counterclockwiseThis causes day and night—half the Earth is always lit and have it always darkStars rise in the East and set in the West (btw, stars do not really rise and set, they are stationary, they just look like they are moving, bc the Earth is rotating—this is called apparent motion)Documented with star trails Slide2

Earth, Moon and Sun

The Earth (cont.)Revolution- Earth’s movement around the sunEarth moves one degree per dayOne year to complete one revolution around the sunCounterclockwiseEvidence of revolution—movement of constellationsWe see different constellations and different times of the yearIe. Orion can only be seen in the winter

Causes SeasonsTilt and curves surface of Earth

cause varying

amounts of

insolation = incoming solar radiationSlide3

Earth, Moon and SunSlide4

Earth, Moon and Sun

The MoonThe Moon revolves around the Earth once every 27.3 days.The Moon also rotates on its axis once every 27.3 days.Because these periods are the same, we only ever see one side of the Moon from Earth.The Moon appears to rise 50 minutes later each night.Slide5

Earth, Moon and Sun

Lunar PhasesOnly the side of the Moon facing the Sun is illuminated...the other side is dark.When the Moon revolves around the Earth, we see varying amounts of this illuminated side...this is why we see the phases of the Moon.The cycle of phases takes 29.5 daysWaxing means the illuminated portion is getting bigger each night.Waning means the illuminated portion is getting smaller each night.

**Complete the diagram on p. 540Slide6

Earth, Moon and Sun

EclipseMoons orbit around Earth is slightly tilted– the moon travels above and below Earth’s orbitOn rare occasions, Earth, the moon and the sun line up causing an eclipseSolar EclipseOccurs during a new moonMoon passes directly between Earth and the Sun, blocking the sunlight from EarthMoons shadow then hits the EarthUmbra- full or darkest part of the shadowPenumbra- partial or larger part of the shadow, people in penumbra see only a “partial” eclipseSlide7

Earth, Moon and Sun

Solar Eclipse (cont.) Eclipse of 2017:Totality path is 70 mi wideThe sun will be completely covered for up to 2 min and 41 sec in some placesLast eclipse on mainland 1979Last total eclipse to cross entire continent of USA 1918Partial eclipse will last over 2 hoursTotality PathDay will seem like nightHorizon will look like sunsetStars will be visibleSuns’s corona (atmosphere) will

be visibleSlide8

Earth, Moon and Sun

Lunar EclipseLunar eclipses only occur during the Full Moon phase.A total lunar eclipse is sometimes referred to as a “blood moon” next Jan. 20, 2019A lunar eclipse occurs when the Earth passes between the Sun and the Moon causing the Moon to be blocked out by the shadow of the Earth.There Earth does create an umbra and penumbra just like in the solar eclipseUnlike the total solar eclipse, a total lunar eclipse can be seen any where on Earth that the moon is visibleThe next Lunar Eclipse will occur on January 31, 2018Will be a partial eclipse in New Orleans with max eclipse occurring at 6:47amSlide9

Earth, Moon and Sun

Tides- the rise and fall of ocean water that occurs about every 12.5 hours2 High tides per day and 2 low tides per day, each 56 hours apartGravity pulls the moon and Earth toward each otherThe gravitational attraction of the moon causes the oceans to bulge out in the direction of the moon. Another bulge

occurs on the opposite side, since

the

Earth is also being pulled toward the moon

(

and away from the water

on

the far side)Slide10

Earth, Moon and Sun

Tides occur because the moon’s gravity pulls the water closest to it4 tides occur in 24 hoursEach day there are two high tides and two low tides6 hours between high tide and low tide12 hours between high tide and the next high tideSpring Tide (has NOTHING to do with the spring seasonOccurs when the moon, earth and sun are alignedGreatest difference between high and low tide heightsSlide11

Earth, Moon and Sun

Neap TideOccurs when the line between the moon and Earth form a right angle to the line draw between the Earth and SunOccurs only during 1st quarter and 3rd quarter moon phases