How Did the Ptolemaic Model Explain the Apparent Retrograde Motion

question 30

Multiple Choice

How did the Ptolemaic model explain the apparent retrograde motion of the planets?

• A)The planets moved along small circles that moved on larger circles around Earth.
• B)The planets sometimes stopped moving and then reversed to move backward along their circular orbits.
• C)The model showed that apparent retrograde motion occurs as Earth passes by another planet in its orbit of the Sun.
• D)The planets resided on giant spheres that sometimes turned clockwise and sometimes turned counterclockwise.

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Definitions:

Pints Of Blood

A measurement unit for blood, commonly used in transfusions and donations, with one pint equaling approximately 473 milliliters.

Endocardium

The innermost lining of the heart, which provides a smooth surface for blood to flow within the heart chambers and valves.

Pericardium

The protective sac of tissue surrounding the heart, helping to support and protect it while allowing it to function efficiently.

Myocardium

The muscular tissue of the heart wall, responsible for the contractile force to pump blood.