Ch 1: Celestial Navigation & Timekeeping

About This Chapter

Watch video lessons and learn about celestial navigation as well as time keeping and related concepts. The quizzes that follow each of the lessons can help you gauge your comprehension of the materials.

About This Chapter

In our fast-paced world, time is a precious commodity that we never seem to have in ample supply, but did you ever wonder how or why time is measured in hours, months, years, or leap years? The video lessons in this chapter help to explain the calendar, the measurement of time, and other events of the celestial sphere. When you have watched all of the lessons, you should feel more knowledgeable about the following:

  • The use of solar time
  • The purpose of leap years
  • How the sun moves during the solstices
  • The tropics of Capricorn and Cancer

Video Objective
Units of Time: Solar, Sidereal and Synodic Define these types of days, months and years.
Apparent Solar Time vs. Mean Solar Time Learn about daylight savings, standard, and universal time as well as their relationship to the mean solar time.
The Origin and Purpose of Leap Years Discuss the history of leap years.
Importance of the Tropic of Cancer and the Tropic of Capricorn Explore the position of these latitudes as well as the circles on the Earth's poles in connection to how the sun moves during certain celestial events.
The Global Positioning System and Its Uses Discuss the various purposes and benefits of global positioning systems (GPS).

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