Rachel Maddow is a big nerd (yay!) and in this segment covers the Earth’s core, magnetic fields, Tampa’s airport, the Moon’s gravity, and how she will not accept being a Pisces.
If you want to nerd a lot more on an astro-logical tip (including the fine distinctions between the Tropical Zodiac, Lunar Zodiac, Planetary Zodiac, and the Real Solar Zodiac), then check out this link.
The Astrological Lore of Ophiuchus: Ophiuchus was better known in classical times as Asclepius, [in Latin, Aesculapius] the God of Medicine. He learnt the art from Chiron, the Centaur. On either side of Ophiuchus in the heavens lie the two parts of the sign of the serpent he holds, Serpens Caput, the Serpent’s Head and Serpens Cauda, the Serpent’s Tail. The twined serpent staff is the badge of the medical profession to this day. [However, the sign of the serpent itself does not form part of the Real Solar Zodiac, though it does [form] part of the Planetary Zodiac.] It is from the Serpent that Ophiuchus learnt the secret of the Elixir of Life.