This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Gregoriancalendarleapgr. Graph showing the seasonal shift of the Gregorian Calendar labels in greek Greek translation of Image Gregoriancalendarleap by Guanaco Badseed public domain see above Time diagrams
Page 2023 Free-images.com. All images are Public Domain