BEHIND THE STARS combines old and new — historical astronomical instruments with modern visualizations — to teach the basics of naked-eye astronomy in 20 interactive segments. 

Four historical instruments await you in BEHIND THE STARS:

• a nocturnal with which you can read the time in the stars,
• a sundial on which you can even read off the date from the Sun’s shadows or the time by the light of the Moon,
• a celestial globe which displays the heavens at a glance, and
• an astrolabe which makes complex celestial calculations easy.