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From the xearth(1) manual page:
"Xearth sets the X root window to an image of the Earth, as
seen from your favorite vantage point in space, correctly
shaded for the current position of the Sun. By default,
xearth updates the displayed image every five minutes. The
time between updates can be changed with the -wait option
(see below); updates can be disabled completely by using
the -once option (see below). Xearth can also render
directly into PPM and GIF files instead of drawing in the
root window; see the -ppm and -gif options (below)."
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