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0.4 (R) Let us suppose that there are some extraterrestrial beings in the vicinity of the Solar System whose lifeform resembles that of a many pointed star and that they intercept a junk U.S. spacecraft containing a partly degraded plaque showing the illustration to the right. Where does this illustration come from and what is its intended meaning? 
Click here for larger view. 
Imaging that you are standing at the
center looking up. Label on this diagram the following:

Here is a schematic diagram of the
hour angle  declination plane as observed from Arecibo. Familiarize yourself
with this diagram and how to use it.
(Note that this one
comes from the good old days, so the limit designations don't include
the Gregorian or ALFA.)
