Mr. Ahearn Earth Science 2010

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Presentation transcript:

Mr. Ahearn Earth Science 2010 Earth In Space Mr. Ahearn Earth Science 2010

Motions of Celestial Objects Celestial Sphere- Imaginary sphere encircling Earth on which all objects in night sky appear.

Motions of Celestial Objects Celestial objects appear to move circular or curved paths (east-west 15*/hr) Sun, moon, planet, stars

Star Paths Stars overhead @ equator follow same path as sun. Stars in southern hemisphere may only be visible briefly (below celestial equator) Northern hemisphere move in circles around Polaris (15*/hr.)

Path of Planets Word planet means “wanderer” Move 15*/hr. plus each has own characteristic motion. Retrograde motion

Path of Planets

Constellations Apparent patterns people use to mark star positions

Models of the Night Sky Geocentric: Earth-centered Heliocentric: Sun-centered

Evidence for Heliocentric Foucault Pendulum Coriolis Effect

Complete Review Book Questions #1-16

Apparent Motions Of The Sun Time is based off of sun’s motion

Seasons Northern Hemisphere -sun highest in sky June 21 (summer solstice) -sun lowest in sky December 21 (winter solstice) - Sept.22 (vernal equinox) -March 21(vernal equinox)

Latitude and Angle of the Sun Path of sun depends on your position Sun is never directly over head in the Continental USA Can be directly overhead in the tropics (23.5 N to 23.5 S) Arctic and Antarctic first day of summer sun never sets, first day of winter sun never rises

Hours of Daylight At equinoxes daylight last 12hrs (except @ poles. At equator 12 hrs of day and nights yr. round

Summer Solstice Winter Solstice

Equinox

Answer Questions #17-45 Review Book p.260

The End See you in outer space!