mythology.
what we call mythology today is what the people in the past used to explain things before we have science to do the job. from solar and lunar movements, the cause of sea wave, earthquakes, the origin of lightning, rainbows, etc. we humans are curious beings. we want to know and be able to explain all the things we see and experience, and that is one thing (of many things) that makes us what we are. and we made myths for that very purpose. myths are the easiest yet satisfactory explanations for things we didn't (yet) understand.