One degree of longitude on equator is equal to a distance of:

1. 49 miles
2. 69 miles
3. 39 miles
4. 60 miles

At the equator, one degree of longitude spans approximately 111 kilometers (or about 69 miles). This precise measurement is derived from the Earth’s total circumference, which is roughly 40,075 kilometers at the equator. Dividing this figure by 360 degrees gives us this key geographic and navigational constant. Understanding this distance is fundamental to cartography, GPS technology, and geographic information systems (GIS). It’s important to note that this distance is specific to the equator; as one moves towards the poles, the longitudinal lines converge, and the distance covered by one degree of longitude decreases significantly, eventually reaching zero at the poles themselves. This principle is a cornerstone of understanding global navigation, geodesy, and the practical application of geographic coordinates in our world.