Time+and+Time+Zones

Using Longititue to Determine Time

The Earth rotates on its axis 15 degrees per hour.
 * 360 degrees / 15 degrees per hour = 24 hours.

Generally speaking there are 24 time zones, each 15 degrees of longitude wide. This is not always the case, as for reasons of convince and commerce, some are smaller, some are larger.

Activity -Sun Shadow Put a stick in the ground, or if you have a south facing window, a stick in the window, or something that will cast a shadow. Mark the location of the shadow, wait an hour, mark the location of the shadow. measure the angle between the two shadows. It should be close to 15 degrees

Activity- Star Trails This is a photograph of the stars taken over an hour. In the middle of the circles is the North Star. Measure the arc length of the stars path. This should be similar to the result from the sun shadow movement from above.

Solar Noon Calculator