Motions of the Earth
Revolution
Earth's axis and seasons
Precession & Motions of the Earth moon-system
Lunar Motions & Eclipses
100
These are the two main motions of Earth.
What is rotation and revolution?
100
Earth revolves around the sun in an elliptical orbit of this speed .
What is 107,000 kilometers per hour .
100
This is the imaginary plane that connects Earth's orbit with the celestial sphere
What is the plane of ecliptic?
100
a result of of the motion of the moon and the sunlight that is reflected from its surface
what are lunar phases?
100
This phase requires 29 1/2 days on a time span called the synodic month.
What is the cycle of the moon?
200
This is a very slow motion which is the slight movement, over a period of 26,000 years
What is precession ?
200
Earth's average distance from the sun is this.
What is 150 million kilometers?
200
Because of this the apparent path of the sun an the and the celestial equator intersect each other at an angle of 23.5 degrees.
What is Earth's tilt?
200
a third and very slow movement of Earth
what is precession?
200
This happens when the moon moves in line directly between Earth and sun, casting a shadow on Earth.
What is a solar eclipses?
300
This is the time it takes in solar days for the Earth to rotate.
What is 24 hours?
300
This is when Earth is closet to the Sun ,at about 147 million kilometers away and this happens about January 3 each year.
What is perihelion
300
Because of the inclination of Earth's axis to the plane of the ecliptic, causing this to occur on Earth.
What is yearly cycles of season?
300
At this point the moon is the closet to the Earth.
What is perigee?
300
During this Earth's circular shadow can be seen moving slowly across the disk of the full moon.
What is a total lunar eclipse?
400
This is the time it takes for Earth to make one complete (360 degrees) with respect to a star other than our sun.
What is sidereal day?
400
This is when Earth is farthest away from the sun at about 152 million kilometers and this occurs July 4 each year.
What is aphelion?
400
Generally, the planets and this travel in nearly the same plane as Earth.
What is the moon?
400
At this point the moon is the farthest from the Earth.
What is apogee?
400
When this happens it cast a circular shadow that is 275 kilometers that is the size of South Carolina.
What is a total solar eclipse?
500
They use sidereal time because the stars appears in the same position every 24 sidereal hours.
What is astronomers?
500
This is the apparent annual path of the sun against the backdrop of the celestial sphere.
What is ecliptic?
500
This is when the spring equinox happens.
What is march 20 or 21?
500
This is the first astronomical event to be understood.
What is the regular cycle of the phases of the moon?
500
This is most commonly found in polar reigons and is also known as the penumbra
What is a partial solar eclipse?
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