It's the question I get asked most. And answering it means admitting something: when I started studying astrology, I didn't know there were two kinds either.
I found out almost by accident, my journalist's instincts still switched on: in this trade, you check before you publish. So one day I did exactly that. I looked up my birth chart online, then used an astronomy app to check it against the real sky on the night I was born.
They didn't match. Not even close.
That's when I learned that most of the astrology out there (horoscopes, apps, the internet) is tropical. It runs on coordinates fixed more than three thousand years ago and never updated since. An inherited map, frozen in time.
Sidereal astrology is the other kind, the one that actually matches what's happening up there, right now, in the real sky. And without knowing it yet, that was the very astrology Nubia had used, all those years before, to read my chart so accurately.
That discovery gave me the principle that still defines my work today: before I interpret a chart, I look at the real, verifiable sky, not an inherited one.