Thanks this is the reply I was looking for

I made a post about this in Archaeology but it was removed so asking here. Apologies about the size.

Why did ancient people use the lunar cycle in addition to the solar cycle?

Tracking the 365 days between a solstice seems like an accurate solution to knowing when seasons will begin/end. If we were to say Spring begins on the 90th day (just an example) this would be accurate for several years.

Why did people supplement this with the use of lunar cycles when they do not line up with the seasons very well (approx 1/3 of a month further out of sync every year)?

The only reason I can think of is that tracking lunar cycles is extremely straightforward and anyone can do it, but it creates the issue of needing to realign every few years (often an extra month after the winter solstice if I remember right). The lunar cycle has been used in essentially every ancient culture so there obviously must be other benefits than it just being 'easy'. What are these?