MOTIONS OF EARTH, MOON AND SUN

MOTIONS OF EARTH, MOON AND SUNMotionsmovements

APPARENT MOTIONMotion that an object appears to make

Daily motion and stars:Paths of all stars appear to be ______ or parts of a _____ called an ___.Rise in the _____ and set in the _____Motion occurs at rate of ___________ (360 in 24 hours)______ remains stationary in the center .circularcirclearcEastWest15o per hourPolaris

**this apparent motion is because the Earth ROTATES!

Star Motion at Middle Latitudes

Apparent Motions of Earths Moon:Same motion as the stars: rises in the ____ and sets in the _____.EastWestApparent motions of the Sun:Path from sunrise to sunset has the shape of an ___.Path changes in two ways throughout the seasons:LengthPosition in the skyReaches highest point in sky at this time of day: __________.arcSolar NoonCan only be directly overhead (90) between ______ and ______.Is the Sun ever directly overhead in New York State?

23.5oN23.5oSNEVER!!

Models that Explain Apparent Celestial Motions:Geocentric model:Earth doesn't move and most celestial objects revolve around itHeliocentric Model_____ is at center of solar systemEarth ________ on its axis and _________ around Sun.Moon _______ on its axis and _________around Earth.

Sunrotatesrevolvesrotatesrevolves24Click to add notesWhich of the two models do we believe today?HELIOCENTRIC MODEL

Moves with our galaxy, called the _________ as the Universe is _________.____________ revolves around center of Milky Way (it takes ____ million yrs.)_______ on its axis and _______ around Sun in an orbit, whose shape is an ______.Actual Earth MotionsMilky WayexpandingSolar System225RotatesrevolvesellipseRotation of EarthEarth spins on its ______.Its axis is tilted at _____.Earth rotates at a rate of ____________.

axis23.515 per hourEvidence of Earths rotationFoucault pendulum

Evidence of Earths rotation (ctd)Coriolis effectAll objects moving at Earths surface are ____________________________________.Deflection appears to the ______ in the Northern Hemisphererightdeflected from a straight line path

Revolution of the EarthRevolves around sun in a slightly ________ orbit.Revolves at a rate of about ___________.How many degrees in a circle?How many days in a year?elliptical1o per day360o365 days360o365 daysEvidence of Earths revolution around the Sun:Different ___________ are visible during different times of the ____.

Apparent size of ____ changes as earth is ______ or ______ awayconstellationsyearSuncloserfurther

Earth Motions and TimeTime is based on Earths _______ on its axis.ALL PLACES ON THE SAME LINE OF ____________ HAVE THE SAME TIME

Time zones:keep time the same for regions

rotationLONGITUDE