Tonight's Sky
Sun
Sun
Moon
Moon
Mercury
Mercury
Venus
Venus
Mars
Mars
Jupiter
Jupiter
Saturn
Saturn

Tonight's Sky — Change location

OR

Searching...

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

° '
° '

Glenn Chaple's Observing Basics: The Medicean stars

November 2009: Jupiter's four largest moons were evidence that not all celestial bodies orbit Earth.
November 2009 Sidereus Nuncius
In drawings from Sidereus Nuncius, Galileo depicted Jupiter’s moons as asterisks. The Italian scientist discovered Io, Europa, and Callisto January 7, 1610, and Ganymede 6 days later.
Linda Hall Library of Science, Engineering, & Technology
You're a newcomer to backyard astronomy. You've already used your telescope to explore the Moon, marveling at its majestic cratered terrain. The experience whetted your appetite to probe deeper into space. What next?

Already a subscriber? Register now!

Registration is FREE and takes only a few seconds to complete. If you are already registered on Astronomy.com, please log in below.
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter.

ADVERTISEMENT
ADVERTISEMENT
BoxProductcovernov

Click here to receive a FREE e-Guide exclusively from Astronomy magazine.

Find us on Facebook

Loading...