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Came across this via a monthly update from Fermat's library.com
It may be of interest to some of you?

Apollo 11 implementation of trigonometric functions Margaret H. Hamilton March 1969 This code was submitted by Margaret H. Hamilton 1 (Programming Leader Apollo Guidance and Navigation) in March 1969 and was used to evaluate trigonometric functions essential for navigation on both the Command Module and Lunar Lander that first landed humans on the Moon.

Code is in attached PDF and also available at

https://github.com/chrislgarry/Apollo-11/blob/ 27e2acf88a6345e2b1064c8b006a154363937050/Luminary099/SINGLE_PRECISION_ SUBROUTINES.agc
A beautiful piece of work that trades accuracy, size and likely performance.
very interesting article
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