This interesting article kind of.. surprised me as it's not something I've ever considered in regard to ancient history- or rather the timeline of it. I guess I just thought a year is a year (365 days) no matter what century. Also interesting how it was politically used.

At 445 Days, 46 BCE Was The Longest Year In History

https://www.iflscience.com/at-445-days-46-bce-was-the-longest-year-in-history-77439

Excerpt:

"...Our calendars are an attempt to break the year down into chunks (months, weeks, days) for our own convenience. It's pretty useful to be able to say "I'll meet you on March 3 at 12:00" as opposed to "When the shadows of the mountain stretch to the hillock yonder, then we shall have brunch".