The 2012 Kentucky Derby will go off at 6:24 p.m. EDT on Saturday evening but races will be run throughout the day. HRTV and NBC will show most of the racing on televsion but you can also watch the 138th Derby and other races live through any internet-enabled viewing device. Online viewing is legal through the official websites streaming the races.
You can view the Kentucky Derby and other races through Twinspires.com live online. The first race started at 10:30 a.m. EDT on this site which allows viewing up to five races at a time on the same screen.
Online coverage from NBC begins at 4:30 p.m. EDT which will show the main races and pre-race coverage of the Run for the Roses from this link.