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

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Presentation transcript:

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

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

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

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

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

The Equation of Time

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

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