I want to know the answer to the following question:
Hipparchus measured the precession of what?
All the background I'm provided with is that "Pliny reports that Hipparchus produced the first systematic star catalog after he observed a new star (it is uncertain whether this was a nova or a comet) and wished to preserve astronomical record of the stars, so that other new stars could be discovered.". Is that enough to answer the question?
Answer: no