1570 sundial ring.
https://diqn32j8nouaz.cloudfront.net/sundial_ring.jpg
Previously:
https://www.homemadetools.net/forum/...558#post151487
https://www.homemadetools.net/forum/...900#post137414
https://www.homemadetools.net/forum/...911#post133620
https://www.homemadetools.net/forum/...474#post142841
https://www.homemadetools.net/forum/...960#post125012
