The concept of planetary alignment isn't a discovery, but rather an observation made throughout history by various civilizations. There's no single person credited with discovering it.

Here's why:

* Ancient observations: Ancient cultures like the Egyptians, Babylonians, and Mayans meticulously tracked the movements of celestial bodies, including planets. They likely noticed patterns and alignments over time.

* No single event: Planetary alignments aren't singular events. They happen regularly, with different planets aligning in various configurations at different times.

* Modern understanding: While ancient civilizations observed alignments, modern astronomy has allowed us to understand the precise movements of planets and predict alignments with high accuracy.

Therefore, attributing the "discovery" of planetary alignments to a single individual would be inaccurate. It's a phenomenon that has been observed and studied for millennia.