Meridians Of Longitude -

| Feature | Description | | :--- | :--- | | | Run vertically from North Pole to South Pole. | | Shape | Half-circles (great semicircles). | | Spacing | Farthest apart at the equator; converge (meet) at the poles. | | Measurement | Measured in degrees (0° to 180°) East or West of the Prime Meridian. | | Function | Determines east-west position and local time. |

They chose the , which passes through the Royal Observatory in Greenwich, England . 0° Longitude: This is the starting point. meridians of longitude

This creates a direct link between a location's longitude and its local time: | Feature | Description | | :--- |