Is latitude a common or proper noun?

The noun 'latitude' is a common noun, a Word for any type of latitude. Examples:

• The northern most town in the US is Barrow, Alaska at 71 degrees north latitude.
• The company gave us a lot of latitude on how we can spend the project funds.

A proper noun is the name of a specific person, place, thing, or a title. Examples:

• Latitude Lane, Lincoln, CA or Latitude Place, Apollo Beach, FL
• Latitude 41° Restaurant, Mystic, CT