The check digit is used to confirm the initial digits of the card number. The benefits of using a checksum is that it prevents casual attempts to invent credit card numbers, as only one in ten will be valid.
Length (adj). the longest, or longer, dimension of any object, in distinction from breadth or width; extent of anything from end to end; the longest line which can be drawn through a body, parallel to its sides; as, the length of a church, or of a ship; the length of a rope or line.
The Equator is the longest latitude. It has a latitude of 0Â° and it's length is about 40,030.2 kilometers (24,873.6 mi). Equator is the longest latitude. i believe thats the â¦ equator.arth is shaped like a sphere, and the circumference of a sphere i â¦ s the longest distance around any part of the sphere. Therefore, this makes the equator the longest line of latitude. 15 people found this useful.