Finding Your Way In The Sky

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Presentation transcript:

Finding Your Way In The Sky

The Big Dipper

Directions in the Sky North is toward the North Celestial Pole South is toward the South Celestial Pole East is toward East on the ground (usually) West is toward West on the ground (usually) On a ground map you’re outside a sphere looking in. On sky maps you’re inside a sphere looking out. East and West on star maps are reversed compared to maps of the ground

Directions in the Sky

Directions Near The Pole

Stars and Constellations Many proper star names are Arabic Catalog labels also used (Alpha Centauri) Constellation names are Latin Ancient groups from Near Eastern myths via Greeks Numerous 17th-18th Century inventions 89 Constellations Fixed boundaries in sky Every star is in one, and only one, constellation There is no “official” way to draw constellations

About Constellation Names Latin uses word endings where we often use prepositions (Compare English ‘s) Possessive form different from normal form Centaurus but Alpha Centauri Andromeda but Alpha Andromedae Gemini – Geminorum Virgo – Virginis Orion – Orionis Ursa Major – Ursae Majoris

Recognizing Constellations They change location They change times they are visible They change orientation Best strategy: Learn shapes and relative locations Different books use slightly different figures. Use whatever works for you

Stars Vary in Brightness and Color 1st Magnitude = Very Bright 2nd Magnitude = Polaris, Big Dipper 3rd Magnitude = Fairly obvious 4th Magnitude = Moderately Faint 5th Magnitude = Faint 6th Magnitude = Barely visible Colors range from reddish through yellow to white and blue-white. Colors are subtle

Some Stars Never Rise or Set

North Polar Constellations

The Late Summer Sky

The Autumn Sky

The Andromeda Myth

The Andromeda Myth

The Andromeda Myth

The Andromeda Myth

The Andromeda Myth

The Andromeda Myth

The Andromeda Myth

The Autumn Sky

Winter Sky at Twilight

The Winter Sky

The Springtime Sky

Early Summer Constellations

Some Southern Stars

The Southern Cross

The Southern Cross

Southern Cross and Centaurus

Southern Cross and Centaurus

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