Birdman," of whom multiple depictions have survived in the Mississippi Valley. He is unmistakably part falcon, part man, just like the god Horus of t… - Graham Hancock

The Julian calendar, which it replaced, computed the period of the earth's orbit around the sun at 365.25 days. Pope Gregory XIII's reform substituted a finer and more accurate calculation: 365.2425 days. Thanks to scientific advances since 1582 we now know that the exact length of the solar year is 365.2422 days.

He said that the signs are already there to be seen … He said that nowadays nothing but the wind blows and that all we do is have a weapon pointed at one another. That shows how far apart we have drifted and how we feel towards each other now. There are no values any more – none at all – and people live any way they want, without morals or laws. These are the signs that the time has come …

It seems [...] that the Native American 'brain smasher' and the ancient Egyptian goddess in the vignette from the Fifth Hour of the Duat both serve exactly the same function, namely, the annihilation and permanent destruction of unworthy souls on the afterlife journey. There are differences in the traditions, to be sure, as one would expect if they descended from a remote common ancestor many millennia ago and then evolved separately, but the fundamental similarities of the role are unmissable.
A further point arising from this material has to do with the more general issue of the trials and tribulations faced by the soul on its postmortem journey. That the precise character of these obstacles should vary between ancient Egypt and ancient Native America is only to be expected. Even so, the striking similarities in the core structure of the 'story' — physical death, a journey of the soul on land, a leap to the sky involving Orion followed by a further journey with perils and challenges to be faced, through the valley of the Milky Way — all argue for some as yet unexplained connection.