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Alt/Az

Alt/Az is used to select objects based on their horizontal coordinates in the sky at the plan's Run time.

Select Ignore if you want to include objects in your report regardless of their horizontal position in the sky. If you want to search using one of the other options, you must uncheck Ignore.

Select By Local Horizon Model to include objects that are above the lower local horizon model and below the upper horizon model at the plan's Run time. A local horizon model may be defined for a location and may include a lower model and/or an upper model. If the selected location has no model defined in it, objects are included in the report regardless of sky position.

Select By Horizontal Position to enter values into Lowest Alt, Highest Alt, Leftmost Az and Rightmost Az. Note that:

▪0° azimuth may refer to either the north pole or the south pole as determined by Preferences

▪The valid range for altitudes is 0° to 90°, inclusively

▪The valid range for azimuths is 0° to 360°, inclusively (360° azimuth is automatically converted to 0°)

If 0 is entered for Lowest Alt, the search result includes all objects located below Highest Alt for the plan's Run time. If 0 is entered for Highest Alt, the search result includes all objects located above Lowest Alt at the plan's Run time. For example, if you want to search for objects above 10°, you would enter 10 in Lowest Alt and leave 0 in Highest Alt. If both are 0, or if Ignore is checked, objects at all altitudes are included in the report.

Leftmost Az and Rightmost Az operate differently. Entering Leftmost Az = 0 and Rightmost Az = 0 results in all objects located at 0° azimuth rather than objects at any azimuth. If you want objects at any azimuth, enter Leftmost Az = 0 and Rightmost Az = 359 (or similar). Note that Leftmost Az may be larger than Rightmost Az if you wish to specify an azimuth range that includes the pole. Leftmost Az and Rightmost Az operate in the same way. Note that Leftmost Az may be larger than Rightmost Az if you wish to specify an azimuth range that includes the pole.