[/caption] You know you’ve always wanted your own sidereal clock. Now, here’s your chance. We’re giving away 10 access codes for the new Sideral Clock astronomy iPhone app. Just send an email to us with “Sidereal Clock” in the subject line and Fraser will choose five winners at random. Sidereal time is a time-keeping system … Continue reading Contest: Win a Copy of ‘Sidereal Clock’ iPhone App