"And the moonbeams kissed the sea: what is all this sweet work worth" -- Shelley

#xmoontool is an #x11 application displaying real time information about the moon.

It uses #Xt and #motif as its main widgets.

Written by John Walker and Ron Hutchins, sometime in 1989, although this version originally ported to "OpenWindows" turned up sometime in December 1991.

I didn't have to modify the code to get it to compile.

When it is iconified, it shows what the moon looks like in the sky (see images attached).

This only works on 8-bit colour-depth displays due to how the XVisuals are used to render the pixmaps.

Interestingly, the following books were used as a mathematical aid for the program to calculate moon things:

"Practical Astronomy With Your Calculator" by Peter Duffett-Smith, Second Edition, Cambridge University Press, 1981.

"Astronomical Formulae for Calculators" by Jean Meeus, Third Edition, Willmann-Bell, 1985.

"Planetary Programs and Tables from -4000 to +2800" by Pierre Bretagnon and Jean-Louis Simon, Willmann-Bell, 1986.

"Celestial BASIC" by Eric Burgess, Revised Edition, Sybex, 1985.

"Astronomy: From the Earth to the Universe" by Jay M. Pasachoff, Second Edition, Saunders College Publishing, 1983

The red dot you can see on the iconified window is commemorative, showing Tranquility Base, to mark the 20th anniversary of Apollo 11 (at the time).

What lunatics!