This is a photo of the original Sky Challenger product.
...and Sky Challengers
Starwheels are inexpensive star maps, adjustable for any time of night in any month of the year.
Such maps are also called planispheres.
In the 1980s, Budd Wentz at the Lawrence Hall of Science with NSF funding developed Sky Challengers, a unique planisphere (adjustable star map) with 6 interchangeable disks:
• Introductory Wheel (basic constellation finder)
• Native American Constellations
• Binocular Sky Treasure Hunt (favorite deep sky objects)
• Test Your Eyes-Test the Skies (a few star magnitudes marked)
• Where Are the Planets? (ecliptic zone marked)
• Invent Your Own Constellations (stars, no constellations)
The original Sky Challenger is no longer in print, but the 6 disks plus holder are now available as a Do-It-Yourself product reduced to allow print on 8.5"x11" cardstock or paper.
See DIY Sky Challengers.
Deriving from the original Sky Challenger design, there are now many interchangeable disks (wheels), available for free on this page that can supplement the original 6 disks of Sky Challengers. These supplementary wheels are sometimes referred to as Uncle Al's Starwheels or Sky Wheels, created by the Hall's Hands-On Universe project.
To Use the Star Wheels