What is linear interpolation?
Linear interpolation is a form of interpolation that creates new values based on an existing set of values. Linear interpolation is achieved by geometrically rendering a straight line between two adjacent points on a graph or plane. All points on the line except the original two can be viewed as interpolated values.
The use of interpolation in astronomy dates back to 300 BC. Early in its history, interpolation served as a tool to study and predict the positions and movements of celestial bodies. Hipparchus of Rhodes used linear interpolation around 150 BC. To construct chord function tables. Over the next 2000 years, civilizations on multiple continents developed many different uses for linear interpolation (in astronomy, mathematics, and beyond). Linear interpolation was widely used in computer graphics in the 20th century.