Latitude and longitude are a system of imaginary lines used to describe the location of any place on Earth. 

Latitude - Imaginary lines that make a circle from west to east.

Lines parallel to the equator are called latitude lines. And all latitude lines are circular.

Important latitude lines

0° – Equator 

23½°N latitude line – Tropic of Cancer

23½° South Latitude Line – Tropic of Capricorn

66½° North Latitude Line – Arctic Circle

66½° South Latitude Line – Antarctic Circle

90° north pole

90° south pole

longitude- Longitude lines are those imaginary lines that work to join the North and South Poles.

0° longitude line was determined from a place called Greenwich in London

 Number of longitude lines – 360