Today, 20 March 2012 is the Spring Equinox in the Northern Hemisphere, and Autumn Equinox in the Southern Hemisphere. The sun rises exactly in the East at 90° and sets exactly in the West at 270°. Where I am in Kuala Lumpur, the sun will be near zenith at 1:21 pm at 87° above the southern horizon.
The direction of the shadows at sunrise shall indicate the East-West direction. So from what I see in the garden, my front gate is not exactly facing East, it's a couple of degrees towards East by South.
Note that due to the earth's axial tilt, there are only 2 days in a year where the sun rises precisely due east and sets precisely due west.
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