緯線

1. Origins, structure, and basic meaning

• Structure: 緯線, read いせん, means a line joining points at the same latitude.
• Basic usage: It is used when comparing city locations on a map or explaining the position and length of the equator.

2. Common pitfalls and similar expressions

• Distinguishing 経線
  • 緯線 joins points at the same latitude in an east–west direction. 経線 joins points at the same longitude in a north–south direction, so the distinction is between latitude and longitude.