Constellations. Celestial Sphere Our Point of View.

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Presentation transcript:

Constellations

Celestial Sphere

Our Point of View

Angular Size and Distance

Relevant Geography

Earth’s Rotation 23 hours and 56 minutes relative to background stars (sidereal period) Spin axis of Earth defines points on the celestial sphere (using north and south poles) –North Celestial Pole –South Celestial Pole –Celestial Equator Sky appears to rotate east to west about the celestial poles because Earth rotates west to east.

Celestial Sphere

Motion on the Sky

Motion Depends on Declination

Circumpolar Constellations Circumpolar constellations never set. Circumpolar constellations change with latitude… sky changes with latitude

Tilt of Spin Axis

The Ecliptic

Ecliptic on the Celestial Sphere

The Equinoxes and Solstices Tilt of the spin axis is related to the seasons Effect of tilt on climate is not instantaneous

Precession of the Earth’s Axis

North Celestial Pole Changes