The Maya used a numerical system, based on the number 20, which included the concept of zero, an accomplishment achieved by only two other civilizations before, the Babylonians and the Hindi. The system was based on dots and bars, where one dot represented one and a bar represented five. This bar-dot system, similar to the one used today by computers (1 and 0) is called a binary system. Using these in different positions the Maya were able to make complex calculations, including certain astronomical operations, which they computed with great precision.
The astounding scientific discoveries made by Maya astronomers included their knowledge of different constellations and the calculation of Venus' precise orbit around the sun.