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from east to west. The Sun and Its Motions This causes each star and constellation to rise a few
minutes later, each day.
However, on a daily basis, the Sun and the stars
move, essentially, together across the sky. Diurnal Motion
Do tutorial I-23 “Seasonal Stars”
Prather Book pages 7 – 9. Diurnal Motion
Do tutorial I-24 through I-28.
These go fast.... The Celestial Sphere
Sun’s Motion The Sun and Its Motions The Sun and Its Motions
Due to Earth’s revolution around the sun, the sun
appears to move through the zodiacal constellations. The Sun’s apparent motion is ~1 degree per day. Diurnal Motion
Do tutorial I-29
“Solar Motion – Diurnal/Annual”
Lecture Tutorial (Blackboard document)
pages 28, 29. Diurnal Motion Earth’s rotation is causing the day/night cycle. Diurnal Motion
Time can be measured in different ways.
Solar time: Time measured by the Sun. (Wall clock.)
Very political – times zones, daylight savings time, etc.
Sidereal time: Time measured by the stars.
(Sidereal clock.) Astronomical – unique to each observer.
Equals the right ascension of the stars on the observer’s
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This note was uploaded on 01/31/2010 for the course AS 103 taught by Professor Millar during the Fall '08 term at Grand Rapids Community College.
- Fall '08