Glossary Glossary Axis A straight line about which a body or object rotates. Counterclockwise The direction opposite of how the clock turns. Ellipse Equator Imaginary line the circles the center of the earth. Latitude Latitude and Longitude are spherical coordinates on the surface of the earth. Longitude Latitude and Longitude are spherical coordinates on the surface of the earth.
Longitude is measured East or West of Greenwich, and can be expressed in different ways.
Rotation Motion in which the path of every point in the moving object is a circle or circular arc centered on a specific axis. Solar Position Position where the sun is straight overhead. The line between day and night. An inclination from the vertical or horizontal slant. If any of you have family in the military, you have probably heard about this way of keeping time.