From: Brad Morris
Date: 2013 Jan 21, 02:00 -0500
All this chatter about super short lunars got me thinking in the other direction.
Is there a place on earth where we could observe a lunar distance of ~180 degrees? Perhaps in the polar regions, where the sun never sets but skims the horizon and the full moon simultaneously visible to the observer?
Would the standard clearing methods work for this lunar? Frank, you warn of errors when the distance is short, but how about when very long? Would your calculator work? If there is an error in clearing long distances, at what angle do we need concern ourselves?
Lunarians may be familiar with Cook's lunar to 155 degrees. I still don't understand how he measured this, given his equipment. He didn't have a circle of reflection, so how did he do it?
What is the longest lunar distance successfully measured and cleared in the log books? Is there any recorded measurement at, say, 160 degrees or more?