![]() ![]() Meanwhile, those of us on Earth's surface are moving along with its rotation, which ranges from around 1,670 km/hr (1,040 mph) at the equator all the way down to zero at the poles. Up in middle Earth orbit, these satellites are moving at high speeds of around 13,900 kilometers per hour (8,600 mph), where time dilation can cause sizable errors. In order for this system to work properly, there are two big obstacles the creators needed to address. Trilateration uses three distances to pinpoint an exact location. West graduated in 1952 with a Bachelor's of Science in mathematics, and came back to complete her Master's in mathematics in 1955 after teaching math and science for a few years. Her family couldn't afford college tuition, but she graduated valedictorian of her high school in 1948 and received a full-ride scholarship to Virginia State College (now known as Virginia State University), a historically black public university. Her family owned a small farm that she worked on as a child, and she knew growing up that education would be her ticket to a world outside farming. West was born on October 27, 1930, in Sutherland, Virginia and was one of seven siblings. Gladys West is an American mathematician who made significant contributions to the development of the Global Positioning System by developing a complex model of the Earth, and you may not have heard of her even though you use the technology she helped develop every day.
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