The Lunar Seas
Let’s take a look a look at the lunar seas before we go into a close-up study of the lunar surface. These seas are visible to the unaided eye and all are easily visible with the simplest of optical aid. Even opera glasses will easily distinguish one sea from another.
At a public star party many people will ask questions like; “What is that dark spot on the Moon in the upper right corner, or what are those large smooth areas?” If they observe through even a small optical finder they will see many areas of dark color. At low magnifications through your scope many persons will ask you what these regions are and what they are called.