Think of how remarkable it is that Almagest can accurately show you the position of the planets at any time during the last three thousand years!
How, for example, were the heavens configured when Henry the Eighth stood and watched the Mary Rose sink off Spit Head on 19th July 1545? Or where in the sky could the Moon be seen, from mission control Houston, say, when Neil Armstrong made his giant step for mankind on the 20th July 1969? Or indeed, in Rome, when Julius Caesar was assassinated on the Ides of March 44 BC?
It is perhaps equally extraordinary to consider that Almagest will accurately show the positions of the planets at every moment for the next 3,000 years (Almagest is, of course, year 5,000 compliant!)