Primer on Spherical Coordinates.

Discuss Altitude and Azimuth, discuss poles, fundamental plane.

Discuss issues with this system for astro purposes.

Discuss degrees of arc, arc mins, arc secs.

Discuss hours or arc, minutes or arc, seconds of arc. Since a complete circle contains 24h of right ascension or 360° (degrees of arc), 1/24 of a circle is measured as 1h of right ascension, or 15°; 1/1440 of a circle is measured as 1m of right ascension, or 15 minutes of arc (also written as 15′); and 1/86400 of a circle contains 1s of right ascension, or 15 seconds of arc (also written as 15″). A full circle, measured in right-ascension units, contains 24 × 60 × 60 = 86400s, or 24 × 60 = 1440m, or 24h. – from wikipedia on RA

Discuss Celestial Sphere. Discuss RA units, discuss DEC units, discuss poles, fundamental plane.

Discuss Hour Angle.

Discuss how to determine an object's alt/az based on RA/DEC/Time/Lat/Lon.

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