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The early astrologers used the ingress (entry)
of the Sun into the Cardinal signs as indicators of what
events and weather might transpire during each period.
| Vernal (Spring) Equinox | 0 Aries | approx. Mar 21 | Days and nights of equal length |
| Summer Solstice | 0 Cancer | approx. Jun 21 | Longest day of the year |
| Autumnal Equinox | 0 Libra | approx. Sep 21 | Days and nights of equal length |
| Winter Solstice | 0 Capricorn | approx. Dec 21 | Longest night of the year |
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The time it takes for each planet to make one complete orbit around the Sun.
| Mercury | 88 days | Mars | 1 year and 322 days | Uranus | 84 years |
| Venus | 224.5 days | Jupiter | 12 years | Neptune | 166 years |
| Earth | 365.25 days | Saturn | 29.5 years | Pluto | 248 years |
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Aphelion: The Sun is farthest from the Earth on June 21st.
Capricorn 20,000 BCE
Sagittarius 18,000 BCE
Scorpio 16,000 BCE
Libra 14,000 BCE
Virgo 12,000 BCE
Leo 10,000 BCE
Cancer 8,000 BCE
Gemini 6,000 BCE
Taurus 4,000 BCE
Aries 2,000 BCE
Pisces 0 CE
Aquarius 2,000 CE?
Perihelion: The Sun is closest to the Earth on December 24th.