Talk:Astronomical rings

Some things to consider
In the very first statement, it says that astronomical rings are an "early astronomical instrument"; how early? Is there a time in history in which the first of these instruments date back to? How do we know these existed? Have any been excavated in any archeological digs? Or were they considered worthy enough to be collected by the wealthy and preserved that way?

How accurate is this instrument?

There are a lot of links to click on this page about topics that not many people know, but I think it would be more time efficient if a little explanation was given on this page. Maybe include a short description of what a gnomon, an alidade, or a dioptra is and who Gemma Frisius is.

Under history it states that "parts of the instruments go back to instruments made and used by ancient Greek astronomers". I think it would be helpful to include a list or explanation of what those instruments were and what they were used for. Include why they were combined by Frisius; what was the purpose of combining them? Jen Johnson (talk) 19:06, 13 September 2013 (UTC)