One of the most useful bits of number-crunching you can do with data is to calculate the probability distribution, in the earnest hope that it will be a reasonable fit for one of the recognised distributions such as the normal distribution. In this project I will write a small C library to calculate the normal distribution for a given data set.

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# Calculating Great Circle Distances

The shortest distance between two locations on the surface of Earth (or any planet) is known as the Great Circle Distance. Except for relatively short distances these cannot be measured on a map due to the distortion and flattening necessary to represent a sphere on a flat plane. However, the calculation of the Great Circle Distance from two coordinates is simple, although I suspect generations of midshipmen might not have agreed. In this post I will write a short program in C to calculate the distance from London to various other cities round the world.

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