• Entry
  • Reader's guide
  • Entries A-Z
  • Subject index

A sundial is a device used to display time. The position of the sun in the sky produces a shadow on a flat surface corresponding to a specific time of day. Although only functional during daylight hours and in direct sunlight, ...

Loading
  • Loading...
locked icon

Sign in to access this content

Get a 30 day FREE TRIAL

  • Watch videos from a variety of sources bringing classroom topics to life
  • Read modern, diverse business cases
  • Explore hundreds of books and reference titles