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Mac Grayliner displays a map of the entire Earth, showing day, night, and more importantly, the terminator between day and night. Studies have shown that enhanced radio propagation occurs between two points which are both on the day/night terminator.

What's New

Version 2.2 offers an improved map, indicates the position of the sun, and automatically quits when the computer is shutdown.


System 7.0 or later

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Current Version (2.x)


Downloads 2,770
Version Downloads 1,450
License Shareware
Date 02 Sep 2000
Platform OS Classic / PPC 32
Price Free
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