ESS Unit 2 Part 5 Quiz - Important Terms

Perihelion distance

147.5 mil km

Aphelion distance

152.6 mil km

Perihelion time

approx Jan 4

Aphelion time

Approx July 4

One full cycle of precession

~26,000 yrs

Rate of precession

1° per 72 yrs

Change in Earth’s axial tilt

22.1-24.5 degrees

One full cycle of obliquity

~41,000 yrs

Last max of obliquity

~10,000 yrs ago

One full cycle of changes in Earth’s eccentricity

~100,000 yrs

Change in Earth’s eccentricity

0.0034-0.058

Ptolemy created

Geocentrist Ptolemaic Model

How long was Ptolemy’s model accepted for

~1,400 yrs

What is the resistance of an object to changes in its state of motion and what causes it

Path of inertia and centripetal force

NET force

Causes elliptical orbit

1 AU in km

~150 mil km

Find mean distance or period of revolution (proportional)

P²=r³

Find solar mass(es)

M=r³/P²