Below are useful links for Lecture 1.

• Celestial coordinates
• Comet Holmes This comet is still visible in Perseus, though only in binoculars now; it was naked eye visible last November and December.
• Night Sky Notes from Abrams Planetarium
• monthly star maps showing current planets visible Click on "sky chart" and download current star map from Charles Hayden Planetarium, Boston
• interactive planet plotter Shows what planets are visible in your sky