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
The band of light called the “Milky Way” traces the galactic plane as it appears from our location in the outskirts of the galaxy.The Milky Way
© Jerry Schad
Apparent path of a particular star
The Dome of the Sky: galactic plane as it appears from our location in the outskirts of the galaxy. Definitions in your local sky
To Polaris galactic plane as it appears from our location in the outskirts of the galaxy.
Angular size of moon ~ ½ o
Angular distance between the “pointer stars” ~ 5o
Latitude and (Note: This is an angle)Longitude
Different sets of constellations are visible in northern and southern skies.
Counter-Clockwise Rotation southern skies.
The Altitude of the celestial pole (Polaris) = your latitude
Path of sunrise for a particular date.
Dennis di Cicco
Seasons- Geocentric View Seasons
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
Units of R.A. Seasons
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.
Solar Eclipses from 2001 to 2022 of a Solar Eclipse
Colors represent successive Saros Cycles.
Prograde or Direct Motion
More distant stars are used as the background for measuring parallax.