It boggles the mind that Tsoukalos has such a low opinion of ancient intelligence that he seriously thinks prehistoric people failed to understand that when someone stands in front of the sun, it looks like he or she has a glow around his or her head.
How do we know this isn't true? Well, here is some ancient art. First up, a depiction of Helios, the Greek god of the sun, from an ancient temple:
What we think of today as a "crown" differs from traditional headdresses worn by ancient monarchs. The modern crown derives from two sources: the sun-beam diadem worn by the priests of Sol Invictus in ancient Rome, which was worn by the Roman emperor in in the imperial period, and the gold circle, or diadem, worn by the Persian emperors and adopted by Constantine as a replacement for the pagan headgear. This diadem, in turn, was a metallic version of what was originally a silk ribbon that connoted royal authority and was wrapped around a conical tiara, itself derived from earlier Mesopotamian tiaras that originated as decorated hats.
In neither case did the crown "imitate" alien helmet reflections. There is no need for such silliness when there are clear antecedents from documented historical periods that prove the origins of the crown. Sol (Helios) was admitted to be the sun, so he can be no misunderstanding of alien helmet reflections, and the diadem and tiara had mundane origins in shawls and hats worn for thousands of years to, ironically, protect the head from the sun.
Need proof that the tiara was a glorified hat and not an alien artifact? Here is the ancient Babylonian ruler Hammurabi (c. 1750 BCE) wearing a domed crown while the sun god Shamash wears a conical tiara that looks like neither a space helmet nor a sun beam, but rather an ice cream cone or sea shell:
Of course we can't prove that the idea for wearing a hat didn't originate in a cave person seeing an alien standing before the sun and thinking, "Maybe I should put big gold triangles in my hair and hold them on with a metal circle." But the weight of the evidence suggests that this hypothesis can better be explained through the simple process of cultural evolution from practical hats to elaborate, impractical crowns meant to distinguish the idle elite from the common working person.
** Note: In this episode I saw David Hatcher Childress actually talk about "the extraterrestrials" by name, and he said that one "can't help" but think about aliens as the origins for ancient rituals. So, frankly, suck it, Childress. You are disingenuous and opportunistic and can never again claim that you don't "do" aliens. I win.