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Lecture 2, Coordinate systems in astronomy

Lecture 2, Coordinate systems in astronomy. The horizon coordinate system. Diurnal motion of celestial objects in horizon system. Objects move on diurnal circles centered on the celestial pole. Why sky changes appearance in different places on the Earth.

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Lecture 2, Coordinate systems in astronomy

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  1. Lecture 2, Coordinate systems in astronomy The horizon coordinate system

  2. Diurnal motion of celestial objects in horizon system Objects move on diurnal circles centered on the celestial pole

  3. Why sky changes appearance in different places on the Earth As the Earth rotates, the zenith points in different directions

  4. The equatorial coordinate system a system like latitude and longitude for the celestial sphere

  5. Two lines on the sky: the celestial equator and the ecliptic

  6. Revolution of the Earth about the Sun: an explanation for many astronomical phenomena The seasonal changes in the night sky… The difference between sidereal and solar time

  7. Why the solar day varies, Part 1…variable angle between celestial equator and ecliptic

  8. Why the solar day varies, part 2…the ellipticity of the Earth’s orbit + Kepler’s 2nd Law

  9. The Equation of Time

  10. The “parade of the constellations” Demo Also look at online animation with the book web site

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