Possible Clues:

• Desire to have it, due to being given no latitude
• Imaginary circles of distance east or west
• Want so much to get it due from North to South
• Imaginary line, moulds glued on it
• Lengthen it, perhaps, due to its going East and West
• Word often paired with latitude
• Distance east or west of the Greenwich meridian
• Distance east or west from Greenwich
• Navigator's number
• It comes to nothing in parts of London