if ($start_minute < 7.5) {$start_minute = .0 ;}
elsif ($start_minute < 22.5) {$start_minute = .25 ;}
elsif ($start_minute < 37.5) {$start_minute = .5 ;}
elsif ($start_minute < 52.5) {$start_minute = .75 ;}
else {$start_minute = 1.0}