How to multiply numbers - Part 2 Trigonometric identities and prosthaphaeresis
How to multiply numbers - Part 1 Complex numbers and multiplication.
Trigonometry, law of cosine and the law of sine
Celestial navigation - Part 3 Is the North Star always the north star?
Celestial navigation - Part 2 North Star and the Southern Cross.
Celestial navigation - Part 1 Latitudes.
Pythagorean theorem and orthogonality
Cosmic distance ladder : The size of the Sun!
Cosmic distance ladder : The size of the moon.
Cosmic distance ladder : To the Sun!
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