What is the term for a line from any point on the earth's surface to the North Pole?

The term that describes a line from any point on the earth's surface to the North Pole is known as True North. This term is important in navigation and mapping as it represents the direction along the earth's surface towards the geographic North Pole. True North is a fixed point and does not change with the magnetic variations of the Earth. It provides a consistent reference for navigation, ensuring that one can accurately orient themselves regardless of their location.

In contrast, other terms like Magnetic North refer to the direction a compass points, which can vary due to magnetic declination. Grid North is used in mapping and refers to the north direction on a grid system, which may differ from True North depending on the map’s projection. Geographic North can often be interchanged with True North but traditionally relates more to the concept of the North Pole itself rather than the navigational reference. Understanding True North is essential for accurate navigation and geographic orientation.