Perihelion and aphelion
15
Celestial Navigation I Capt. Bernabe Lim INSTRUCTOR
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Celestial Navigation I
Capt. Bernabe LimINSTRUCTOR
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Perihelion and
Aphelion
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PERIHELION
•closest point of Earth to sun•distance about 1.5 M miles less than the mean distance•occurs on early January
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APHELION
•Farthest point to sun•about 1.5 M miles greater than the mean distance•occurs on early July
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MOTION OF BODIES OF THE SOLAR SYSTEM
• Video
Two principal motions• Rotation• Revolution
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ROTATION
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ROTATION
• Rotation of Earth around axis• Rotates to East• Turns counter-clockwise• Daytime and night time• 24 hours or 1 day
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REVOLUTION
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•Motion of body in elliptical orbit•365.25 days or a year
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Thank you for listening!
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