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