Tropics – A region where the sun is directly overhead in the zenith at least once a year and lie between 23.5 N (tropic of cancer) and S (tropic of Capricorn).
Equator - Lies exactly between the Poles. The sun is directly above the equator twice a year on the equinoxes
Latitude –how far north or south you are measured in degrees from the equator
Longitude – how far east and west you are measured in degrees from the Greenwich meridian up to 180 degrees
Pole – The pole is a point on the earth at the axis of rotation
Zenith – The point directly above the observers head
Horizon – The furthest visible point of the Earth’s surface from the observer’s position
Meridian – An imaginary line intersecting the Pole to the observer’s zenith