Discovering The Universe for Yourself. Patterns in the Sky. The Constellation Orion. Constellations: Recognizable patterns in the sky are called Constellations. There are 88 Constellations. 12 are based on the Zodiac. Orion, Leo, Aries, Taurus, etc.
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The Constellation Orion
© Jerry Schad
Apparent path of a particular star
Angular size of moon ~ ½ o
Angular distance between the “pointer stars” ~ 5o
The Altitude of the celestial pole (Polaris) = your latitude
Path of sunrise for a particular date.
Dennis di Cicco
The apparent path of the Sun on the celestial sphere, showing how the seasons arise.
Figure from Astronomy Today, 3rd ed., Chaisson & McMillan, Prentice-Hall, ©1999
360o = 24h
Note: Look at top view to understand rise and set times.
Nodes occur at points where the orbit crosses the surface of the pond
(Sunlight is partially blocked)
(Sunlight is fully blocked)
Multiple Exposure Photograph of Progression of a Solar Eclipse
Totality- lasts only a few minutes.
The Solar Corona becomes visible.
Colors represent successive Saros Cycles.
Prograde or Direct Motion
More distant stars are used as the background for measuring parallax.