+.Pp
+.Bl -tag -width [[[[[cc]yy]mm]dd]HH]
+.It Ar [[[[[cc]yy]mm]dd]HH]
+Display the phase of the moon for a given time.
+The format is similar to the canonical representation used by
+.Xr date 1 .
+.El
+.Sh SEE ALSO
+.Xr date 1
+.Sh AUTHORS
+.Nm
+was written by
+.An Keith E. Brandt .
+.Sh BUGS
+Times must be within range of the
+.Ux
+epoch.
+.Pp
+This program does not allow for the difference between the TDT and
+UTC timescales (about one minute at the time of writing).
+.Sh ACKNOWLEDGEMENTS
+This program is based on algorithms from
+.%B Practical Astronomy with Your Calculator, Third Edition
+by Peter Duffett-Smith
+.Aq pjds@mrao.cam.ac.uk .