apparent motions of the sun
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Apparent Motions of the Sun Do Now: Look at this picture of the Rising Sun. What direction is the camera pointing?. Rises? Sets? Midday? Useful for? Telling time and direction How does it tell time and direction?. - PowerPoint PPT PresentationTRANSCRIPT
Apparent Motions of the SunDo Now: Look at this picture of the Rising Sun. What direction is the camera pointing?
Rises?Sets?
Midday? Useful for? Telling time and direction
How does it tell time and direction?
Sun Dials: Indicate time by the movement of the sun across the sky according to the shadow it forms.
Also used for direction.
What direction is the shadow in? Where is the sun? So what time is
it?
It’s 12 noon, which way is this guy facing?
http://www.eram.k12.ny.us/education/components/docmgr/default.php?sectiondetailid=17500&fileitem=633&catfilter=333
http://science.sbcc.edu/~physics/flash/LengthofDay.swf
Does the sun actually “rise”?
What is actually moving?
Our system of time is based on the apparent motion of the sun across the sky. The motion of any object across the sky is apparent because it is not moving as it appears to be.
Rotation vs. Revolution
Foucault pendulum & the Coriolis Effect
http://www.classzone.com/books/earth_science/terc/content/visualizations/es0403/es0403page01.cfm
Proof of Earth’s Rotation
Aim: What causes the Seasons?
During which time of year is the Angle of the sun highest in New York? Hawaii? Any place in the Northern Hemisphere
You decided to plant a garden in your NY backyard, in which
direction should the garden face to maximize sunlight?
Approximately how many hours of sun-light does the North pole receive on March 23rd? How
about 42*South?
During which time of year is the Angle of the sun highest in New York? Hawaii? Any place in the
Northern Hemisphere?Why?
Remember! It’s all about the TILT
During which time of year is the duration of Insolation the Least in
New York? Hawaii? Alaska?