Astrology dates back into antiquity long before telescopes. Stars and planets were just dots in the sky, only difference is that planets move relative to the static stars hence their name (planet means something like wanderer).
I have heard stuff in astrology like "Mars is in the house of Taurus". Don't know what exactly it means but it is very important
Yeah but, Mars is awfully bright tonight. Explain that!
Those who are educated amongst us know this is a clear sign that Voldemort is on the rise. To each their own, though. Go ahead and just be unprepared for the Dark Lord's reprisal.