Lecture 2 coordinate systems in astronomy
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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
Lecture 2, Coordinate systems in astronomy

The horizon coordinate system


Diurnal motion of celestial objects in horizon 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
Why sky changes appearance in different places on the Earth

As the Earth rotates, the zenith points in different directions


The equatorial coordinate system
The equatorial coordinate system

a system like latitude and longitude for the celestial sphere



Revolution of the earth about the sun an explanation for many astronomical phenomena
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 2 the ellipticity of the earth s orbit kepler s 2 nd law
Why the solar day varies, part 2…the celestial equator and eclipticellipticity of the Earth’s orbit + Kepler’s 2nd Law


The equation of time
The Equation of Time celestial equator and ecliptic


The parade of the constellations
The celestial equator and ecliptic“parade of the constellations”

Demo

Also look at online animation with the book web site


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