One of the comments reads : Actually, we will probably never figure out, was it man or woman. but I thought this comment of the professor was an interesting eye opener. https://mastodonapp.uk/@MarkHoltom/112070436760917344
If you start to notice one thing happens pretty regularly and another thing happens regularly but on a larger scale... Say the monthly moon phases and the seasons, you can use the more frequent one to roughly track the less frequent one.