Geographic Grid — Latitudes and Longitudes

Topics

• Latitudes

  • Main latitudes and parallels
  • Uses of parallels of latitude

• Longitudes and time

  • Prime Meridian and eastern and western hemispheres
  • Local and standard time, time zones, GMT and IDL
  • Locating places and calculating time
  • Great circles and their use

Learning objectives

1. Use longitude to calculate a local-time difference between two places.