Positioning the Moon Numerically

To position the moon numerically:

Display the Sky & Fog palette by clicking the Sky & Fog button at the top of the Bryce window.
Click the Sky Lab button. The Sky Lab appears.
Click the Day/Night toggle to display the moon icon.
In the Sun Controls area, type a value into the Azimuth field. The Azimuth field controls the east-to-west position of the sun/moon. The range is 0 to +360, and the default value is 60. The moon will be positioned exactly opposite these values, so you can invert them to position the moon numerically or place the Sun behind the camera so that the moon appears in front of it.
Enter a value into the Altitude field. The Altitude field controls the height of the sun/moon relative to your scene. The range is -99 to +99. Positive values are below the horizon, negative values above.
Check the results to see if any further changes are needed.
Click the OK icon to exit the dialog.