x11/xearth 1.1nb3 NetBSD

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)."