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Chapter 3 - Nicholls State University
Chapter 3 - Nicholls State University

... The figure shows a planet’s orbit that obeys Kepler’s laws. However, not all of the shaded regions have equal areas. During which part of the planet’s orbit (A, B, C, or D) would the planet move with the greatest speed? ...
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... with respect to the background of stars  Most of the time a planet moves eastward in direct motion, in the same direction as the Sun and the Moon, but from time to time it moves westward in retrograde motion ...
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SNC1P - The Study of the Universe Exam Practice Questions

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... rotation period, relative to a distant, non-moving reference frame (the stars). The solar day is the time it takes for the Moon to complete a cycle of phases as seen from Earth.! ...
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Lunar theory

Lunar theory attempts to account for the motions of the Moon. There are many irregularities (or perturbations) in the Moon's motion, and many attempts have been made to account for them. After centuries of being problematic, lunar motion is now modeled to a very high degree of accuracy (see section Modern developments).Lunar theory includes: the background of general theory; including mathematical techniques used to analyze the Moon's motion and to generate formulae and algorithms for predicting its movements; and also quantitative formulae, algorithms, and geometrical diagrams that may be used to compute the Moon's position for a given time; often by the help of tables based on the algorithms.Lunar theory has a history of over 2000 years of investigation. Its more modern developments have been used over the last three centuries for fundamental scientific and technological purposes, and are still being used in that way.
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