Hourly temperatures (°F) at Washington, DC for January 10 through December 31, 2004 are presented in a polar plot as radial lines or points. By moving the slider the magnitudes of all available temperatures for a specified hour of the day are presented as their distance from the plot's center.

The function transforms angles from geometric to geodetic. For example, the geometric angle of 90 degrees must become zero degrees to be at the 12 o'clock position; geometric 0 degrees must become 90 degrees to be at 3 o'clock, etc.