Hi Judith,

Hmmmm... can you be more specific?

Guide will generate occultation paths and data. You can,
for example, right-click on the moon, then right-click on
a star, then use Extras... Show Eclipse to display the
occultation path. You can then use Next and Previous to
display following and preceding occultations of that star
by the moon. Similarly for lunar occultations of planets
and of the sun.

The two objects involved in an occultation can be somewhat
general; for example, make them Venus (or Mercury) and the
sun, and you can find and show occultation data for transits
of those planets. Make it the moon and sun, and you can
show solar eclipses. (Probably the most common use of this
feature.)

The flexibility isn't total; you can't show occultations
involving an artificial satellite. (Several people would like
this, since it would be nice to show places where the ISS
is going to transit the sun or moon.)

You can read more about Guide's handling of occultations
in chapter 18 of the Guide user manual, or on-line at

http://www.projectpluto.com/manual/page60.htm

Claudio Costa suggested Occult, which is a good choice for
making lists of events ("show me cases where the moon will
occult Aldebaran over the next 50 years.") At least right
now, Guide can't do that. (But take a look in Tables...
Miscellaneous Tables; there are a few event lists there,
for such things as asteroid occultations of stars in a
given year.)

-- Bill