'Riders!' cried Aragorn, springing to his feet. 'Many riders on swift steeds are coming towards us!'
'Yes,' said Legolas, 'there are one hundred and five. Yellow is their hair, and bright are their spears. Their leader is very tall.'
Aragorn smiled. 'Keen are the eyes of the Elves,' he said.
'Nay! The riders are little more than five leagues distant,' said Legolas.
-- The Two Towers Chapter 2: The Riders of Rohan
As discussed at blissful length here, if Legolas can count a hundred riders at five leagues (15 miles), he can also literally see the motion of the planets across the sky - where it would take a mortal most of the night to be able to detect the motion of Mars against the starfield, Legolas could discern it in under ten minutes.
Quite clearly, the combination of this with the circles thing (different universes? what different universes? ^_~) indicates that elves were created to be natural astronomers, just like dwarves are natural miners and humans are natural mayhem-generators.
As further evidence: Terry Pratchett's elves (Discworld) can make themselves appear however they want. Obviously, this is because an astronomer up all night winds up looking rather haggard, so they don't want to waste time making themselves look respectable.
Come to think of it, Pratchett elves are also natural universe-hoppers, explaining a) why they show up in so many canons, and b) which stars they're meant to observe - all of them.