Study of the earth s movements
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STUDY of the EARTH’s Movements. 6 th Grade Science . What is mathematical shape is the Earth? . Sphere. What does it mean when an object is a sphere? . Sphere : a round, 3-dimensional object . Its surface is the same distance from its center at all points .

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Study of the earth s movements

STUDY of the EARTH’s Movements

6th Grade Science



Sphere
Sphere

  • What does it mean when an object is a sphere?


Sphere a round 3 dimensional object
Sphere: a round, 3-dimensional object

  • Its surface is the same distance from its center at all points


What are other examples of spheres besides the earth
What are other examples of spheresbesides the Earth?



There were many people who suspected that the earth took the shape of a sphere
There were many people who suspected that the Earth took the shape of a sphere.


Aristotle around 350 b c
Aristotle –around 350 B.C.

  • Believed that the Earth was a perfect sphere and that all planets orbited around it


Aristotle noticed that the earth cast a curved shadow on the moon during an eclipse
Aristotle noticed that the Earth cast a curved shadowon the moon during an eclipse


Study of the earth s movements
*Besides Aristotle, many other individuals suspected that the Earth was round. *How did they start suspecting this?


Certain sailors also believed that the earth was round why
Certain the Earth was round. sailors also believed that the Earth was round. Why?


Study of the earth s movements
Sailors noticed that in approaching ships, the tops of ships came across the horizon and appeared first


Is the earth a perfect sphere
Is the Earth a came across the horizon and appeared firstperfect sphere?


Study of the earth s movements
No! came across the horizon and appeared first

  • ItBULGESslightly at the equator

  • It is FLATTENEDat the poles

  • Not a PERFECT sphere


Did you know that the movements of the earth cause the day and night and the seasons
Did you know that the movements of the Earth cause the came across the horizon and appeared firstday and night and the seasons?


What would you guess causes day and night
What would you guess causes came across the horizon and appeared firstday and night?


Earth s r otation
Earth’s came across the horizon and appeared firstRotation

  • Rotation: the action of spinning around an axis or center


Earth s rotation
Earth’s came across the horizon and appeared firstRotation

  • How does the Earth’s rotation cause day and night?


Study of the earth s movements
As the Earth came across the horizon and appeared firstrotates, part of the Earth faces away from the Sun, and faces dark outer space. This is what causes day and night.


How long does it take for the earth to rotate once around its axis
How long does it take for the Earth to came across the horizon and appeared firstrotate once around its axis?


24 hours
24 Hours! came across the horizon and appeared first


While it is day in the united states it will be night in other parts of the world
While it is came across the horizon and appeared firstday in the United States, it will be night in other parts of the world


Study of the earth s movements
You can’t feel the Earth’s came across the horizon and appeared firstrotation, but standing on top of the Earth is like riding a giant spinning top


As the earth rotates you can see the sun come into view at daybreak
As the Earth came across the horizon and appeared firstrotates, you can see the Sun come into view at daybreak.


Earth continues to spin making it seem as if the sun moves across the sky until it sets at night
Earth continues to spin, making it seem as if the came across the horizon and appeared firstSun moves across the sky until it sets at night


Study of the earth s movements

During night, your area of the Earth has came across the horizon and appeared firstrotated so that it is on the opposite side of the Sun *We can’t see the Sun anymore, but the Sun is still lighting up the moon.


What is the earth s axis
What is the Earth’s came across the horizon and appeared firstaxis?


Earth s axis the imaginary vertical line around which earth spins
Earth’s axis came across the horizon and appeared first: the imaginary vertical line around which Earth spins


The earth s axis is tilted 23 5 degrees
The Earth’s axis is tilted came across the horizon and appeared first23.5 degrees


Because of this the earth is like a spinning top that is spinning slightly to the side
Because of this, the Earth is like a came across the horizon and appeared firstspinning top that is spinning slightly to the side.


The tilt of the earth s axis is actually very important what does the tilt of its axis cause
The tilt of the Earth’s axis is actually very important. came across the horizon and appeared firstWhat does the tilt of its axis cause?


The tilt of earth s axis causes the seasons it causes the seasons as it is revolving around the sun
The tilt of Earth’s axis causes the came across the horizon and appeared firstseasons! It causes the seasons as it is revolvingaround the Sun


Revolution to revolve is to move in a circular path around something else
REVOLUTION came across the horizon and appeared first: to revolve is to move in a circular path around something else

  • Remember that the Earth revolves or orbits the Sun in the shape of an ellipse


Earth s axial tilt and ellipse shaped revolution causes the seasons
Earth’s came across the horizon and appeared firstaxial tilt and ellipse-shaped revolution causes the seasons


Find north america when is it getting the most sunlight
Find North America: When is it getting the most came across the horizon and appeared firstsunlight?


The sun shines more brightly on either the northern and southern hemisphere depending on the season
The Sun shines more brightly on either the Northern and Southern hemisphere depending on the season


Radiation from the sun
Radiation from the Sun Southern hemisphere depending on the season

  • Earth’s axial tilt causes the Sun’s radiation to strike the hemispheres at different angles

  • In Summer, the Northern Hemisphere is tilted toward the sun, so it is getting more direct sunlight


Study of the earth s movements

During winter in North America, the Sun is still shining, but because of axial tilt, North America is facing away from it and not getting very much light.


Study of the earth s movements

Daylight hours are longer for the hemisphere that is tilted toward the Sun because that hemisphere has more exposure to light for a longer period of time


What is an equinox
What is an Equinox? toward the Sun because that hemisphere has


Equinox occurs when the sun is directly above the earth s equator
Equinox toward the Sun because that hemisphere has : occurs when the Sun is directly above the Earth’s equator


Equinox occurs 2 times per year
Equinox toward the Sun because that hemisphere has : occurs 2 times per year

  • During an equinox, the number of daylight hours and nighttime hours is nearly equal all over the world

  • Northern Hemisphere: The Sun reaches the spring equinox on March 20-21, and the fall equinox occurs on September 22-23


What is a s olstice
What is a toward the Sun because that hemisphere has Solstice?


Solstice either the longest day of the year or the shortest day of the year
Solstice toward the Sun because that hemisphere has : either the longest day of the year or the shortest day of the year


A solstice is when the sun is at its greatest distance from hitting the equator
A toward the Sun because that hemisphere has Solstice is when the Sun is at its greatest distance from hitting the equator

  • Summer solstice in the Northern Hemisphere = June 21  longest day of the year

  • Winter solstice in the Northern Hemisphere = December 21  shortest day of the year


Look at the yellow dots where are the solstices
Look at the Yellow Dots. Where are the Solstices? toward the Sun because that hemisphere has


How long does one revolution around the sun take for planet earth
How long does one toward the Sun because that hemisphere has Revolution around the Sun take for planet Earth?


365 days
365 ¼ days toward the Sun because that hemisphere has

  • 4 Seasons