Staring intently at the dot patterns, Victor cannot discern what they are supposed to be. If anything, they resemble an astronomical star chart of the heavens, including some stars being larger than others and scattered about in a fairly random array, except they don't form a pattern of recognizable stars.
If this is a star chart it's from a time so ancient the stars themselves have moved, or it's from a completely different universe, something many sages have said could exist.
Even though Victor isn't an astronomer, growing up in a lower technology world makes him more aware of star patterns than most modern humans. Time in the evening is often told by the constellations and their rotation around the pole star, so citizens of the Empire with little access to clocks (and what few clocks they do have are generally primitive) are adept at reading the stars.
Other planes are known to exist and many of them have different constellations. Empire citizens, especially those in an Academy, can reasonably know that stars migrate over centuries... the elves are very aware of this fact.
It is unlikely that this represents an older star chart, because these ruins are nowhere nearly old enough for this to be a factor.