36,800
edits
Platonic Month: Difference between revisions
no edit summary
No edit summary |
No edit summary |
||
| Line 7: | Line 7: | ||
The vernal equinox spends on average 2144 years in one sign of the zodiac. This epoch is known as a Platonic month. A Platonic day is roughly 72 years, the average age of a human being.<ref>[https://www.astro.com/astrowiki/en/Platonic_Year Platonic Year]</ref> | The vernal equinox spends on average 2144 years in one sign of the zodiac. This epoch is known as a Platonic month. A Platonic day is roughly 72 years, the average age of a human being.<ref>[https://www.astro.com/astrowiki/en/Platonic_Year Platonic Year]</ref> | ||
==Precession of Equinoxes== | |||
[[File:670px-Earth precession.svg.png|thumb|Earth Precession]] | |||
Earth's precession was historically called the precession of the equinoxes, because the equinoxes moved westward along the ecliptic relative to the fixed stars, opposite to the yearly motion of the Sun along the [[Ecliptic]].The precession of the Earth's axis has a number of observable effects. First, the positions of the south and north celestial poles appear to move in circles against the space-fixed backdrop of stars, completing one circuit in approximately 26,000 years.<ref>[http://en.wikipedia.org/wiki/Axial_precession Axial Precession]</ref> | |||
==References== | ==References== | ||