The document discusses the Earth's grid system of lines of longitude and latitude that are used to locate positions on the globe. It defines key terms like the prime meridian at 0° longitude which runs through Greenwich, England. Meridians run from the North to South Pole and are lines of longitude. The equator is at 0° latitude and divides the globe into northern and southern hemispheres. It describes how longitude is measured in degrees east and west of the prime meridian, and how latitude is measured in degrees from the equator to the poles. It also discusses the International Date Line and how time zones are used to standardize time zones based on longitude.

1. THE EARTH’S GRID SYSTEM MODULE 13 PAGES115-124

3. The Prime Meridian is the meridian (line of longitude) at which longitude is defined to be 0°.

4. Lines run from North pole to the South Pole crossing the equator is called Meridians

5. The equator is the intersection of the Earth's surface with the plane perpendicular to the Earth's axis of rotation and containing the Earth's center of mass.

8. Time Zones A time zone is a longitudinal belt of the earth in which all areas have the same local time. The time it takes the sun to appear and reappear in the same place in the sky is called a solar day. The regular rotation of the earth is our best telling of time. The Earth rotates a total of 360 degree every 24 hours or every day. If the total rotates of the earth in every hour is 15 degree. The country have the different time because they have different time zone as you can see in globe. The time of the different country depend on the time zone they have or locate in the globe.

10. The first 12 hours last from midnight to noon and the second 12 hours lasts from noon to midnight.

11. The change of date is made at midnight.

12. When it is noon at the prime meridian is O degree.