How does a sundial work?


		How does a sundial work?
		Resources from the Computers in Science Book PDF of this chapter Daylength Worksheet Daylength spreadsheet
		An animation showing the Moon orbiting the Earth and the Earth orbiting the Sun. Quick to load. http://www.fearofphysics.com/SunMoon/sunmoon.html
		Universe Now - gives sunrise and sunset time for different places in the world. http://www.schoolsobservatory.org.uk/uninow/sunrs/sunrs_yr.htm
		Earth View allows you to view a map of the world showing day and night regions as they appear now. http://www.fourmilab.ch/earthview/
		'A learning centre for young astronomers.' http://starchild.gsfc.nasa.gov/docs/StarChild/StarChild.html
		An animation of the Earth orbiting the Sun. Shows the tilt of the Earth and tells you the time of year as it orbits. Can be stopped at whatever point you wish. Needs Flash plugin. http://www.astro.uiuc.edu/projects/data/Seasons/seasons.html
		'Seasons Reasons' - explanation of why we have seasons, includes an animation of the Earth as viewed from the Sun over a year. http://www.scienceu.com/observatory/articles/seasons/seasons.html
		Earth Imaging is a company selling satellite images of Earth. Interesting for pupils to see commercial uses of satellites. http://www.earthimaging.com/
		A BBC tour of the Solar System visiting each of the planets. Takes a while to load and needs the Shockwave plugin. Designed to appeal to chidren. http://www.bbc.co.uk/science/space/solarsystem/index.shtml
		Earthbrowser - watch the night-time shadow move across the Earth as it rotates. Shareware for both PCs and Macs. http://www.earthbrowser.com/