Full Circle 

So beautiful, I love how this was done, thank you

The Celtic Tree(Druid) calendar: it's a solar calendar, with thirteen months of 28 days apiece. There is an extra day (two days in leap years) at the end of the year. The months are named after trees:

Beth (Birch), Luis (Rowan), Nuin (Ash), Fearn (Alder), Saille (Willow), Huath (Hawthorn), Duir (Oak), Tinne (Holly), Coll (Hazel), Muin (Vine), Gort (Ivy), Ngetal (Reed), Ruis (Elder).