Toggle the constellation lines on and off using View/ Show Constellations. You can configure constellation colors using the Options/ Colors dialog box.
Why Stars and Constellations?
There is no doubt about it, there are better programs out there for displaying
the optical sky than Radio Eyes. So why do we bother displaying stars and
constellation lines in a program that is supposed to be about the Radio
Sky? The answer is that it allows us to orient ourselves using these guideposts
that humans (and maybe other animals) have used for thousands of years.
Even if your knowledge of the optical sky is limited (as is mine), you probably
can recognize a few constellations. Suppose you want to do a drift scan of
Cygnus A, a very strong radio source. You set everything up, print out a Tracking
Table and a Meridian Drift Scan
Table. A couple of hours before the observation, you go out to set the
elevation of the antenna and looking up into the clear dark sky you can see no
sign of the constellation Cygnus! Ahh! You run back inside and see
you have set your longitude wrong by 180 degrees in Radio Eyes! You are 12
hours out of sync with the universe.
So you see the optical sky can be very handy to radio astronomers. When
Jupiter was discovered as a radio source it was spotted optically to be in the
beam of the antenna! If you don't like the features like stars and
constellations, turn them off.