For Use Between 30 - 60 Degrees North Latitude
The Messier Observer’s Planisphere was designed
for observers in the northern hemisphere
between 30 degrees and 60 degrees of latitude.
If you are using the planisphere at a location
that is further north or south, it will not
give an accurate representation of which stars
are above or below the horizon at a given date
and time. In fact, for observers located south
of 30ºN, there will be some stars visible in
the sky that are not even printed on the map!