5. Location of the Sun and Moon

The SUN-MOON program, prepared by E.R. Schiffmacher, gives the position of the Sun and Moon for any observer latitude/longitude and selected time (in universal time, UT). The solar and lunar local transit, rise and set times, and location with respect to the observer at any given hour and minute (UT) are specified. The solar zenith angle, ?, given in this program, is 90? minus the elevation angle of the Sun. The square-root of the cosine of this solar zenith angle (called the Chapman function; see Section 2.3) is used when discussing the ionospheric E-region ionization and electrical conductivity for the quiet-time dynamo currents of thermospheric wind and tidal origin. To run the program, insert the disk in the computer, select the drive letter for the disk, enter SUN-MOON and follow the directions. An example screen is shown below.

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