The Hidden Link Between Planets and Metals
The symbols we use for planets today were originally created for alchemy. Ancient scholars believed each planet was physically linked to a specific metal, like gold for the Sun and iron for Mars.
This celestial connection served as the foundation for both early chemistry and our weekly calendar. For example, the symbols for the days of the week are directly tied to these planetary-metal associations. While astronomers stopped using these icons for science, their influence remains embedded in our language and history. It is a rare case where the mystical dreams of alchemists helped organize the way we track time.
Source: Planetary symbols