Celestial Motion Quiz
3 Questions
3.3 Stars

Celestial Motion Quiz

Test your knowledge on the motion of stars in the sky as viewed from the Earth's equator. Learn about how star paths appear to rise and set in different parts of the sky based on their declination.

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Questions and Answers

Match the following time measurements with their definitions:

Terrestrial Time (TT) = Based on mean solar time in Moscow Sidereal Time = Based on positions of stars relative to the meridian Solar Time = Defined according to the Sun's position relative to the meridian Hour Angle (HA) = Time since an object last crossed the meridian

Match the following statements about hour angles with their correct interpretation:

Hour Angle of 0h = A star is crossing the meridian now Hour Angle of 3h = A star crossed the meridian 3 hours ago Hour Angle of -1h = A star will cross the meridian 1 hour from now Hour Angle of 23h = Equivalent to a star crossing the meridian 1 hour from now

Match the following terms with their meanings in celestial navigation:

Local Sidereal Time (LST) = Hour angle of the March equinox Right Ascension = Relationship with current hour angle and LST for an object Tropical Year = Approximately 365.25 days in length Leap Years = When and why they occur

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