the apparent motion of a planet, as viewed from earth, during the period of a few
weeks or months when it moves westward relative to the stars in our sky
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apparent retrograde motion
the period over which the basic pattern of eclipses repeats, which is about 18 years 11
1/3 days
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saros cycle
, an event in which one astronomical object casts a shadow on another or crosses our
line of sight to the other object
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eclipse
the point directly overhead, which has an altitude of 90 degrees
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zenith
a measure of the angle formed by extending imaginary lines outward from our eyes to
span an object (or the space between two objects)
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angular distance (or angular size)
the rotation of an object that always shows the same face to an object that it is
orbiting because its rotation period and orbital period are equal
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weeks or months when it moves westward relative to the stars in our sky
Give this one a try later!
apparent retrograde motion
the period over which the basic pattern of eclipses repeats, which is about 18 years 11
1/3 days
Give this one a try later!
saros cycle
, an event in which one astronomical object casts a shadow on another or crosses our
line of sight to the other object
Give this one a try later!
eclipse
the point directly overhead, which has an altitude of 90 degrees
Give this one a try later!
zenith
a measure of the angle formed by extending imaginary lines outward from our eyes to
span an object (or the space between two objects)
Give this one a try later!
angular distance (or angular size)
the rotation of an object that always shows the same face to an object that it is
orbiting because its rotation period and orbital period are equal
Give this one a try later!
