use Data::Dump qw/ dd /;
# Creates a shortcut for calling Data::Dumper, writing dd is enough to call module

##</code><code>##

Main( @ARGV );
# main function, takes every file (as an argument) that is passed to @ARGV, might be command line or files
#that are read in

##</code><code>##

exit( 0 );
#not really a clue, maybe main exits if no arguments are passed to it

##</code><code>##

    dd( -argv, \@ARGV );
#calls Data::Dumper via reference => possibly to print which files are being passed as arguments (control function) 

##</code><code>##

    Sky(6);
#not really a clue => Does that mean that the sub stops after six runs 

##</code><code>##

    my( $ra ) = @_;
    # variable for the argument(s) passed to the sub, @_ accepts every argument passed to sub, i.e. the files passed to main