This is what's special about a full supermoon occurring on the equinox this year:
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Just 800 years ago, perihelion and the winter solstice aligned. Due to the precession of Earth's orbit, they are slowly drifting apart, completing a full cycle every 21,000 years. 5,000 years from now, the spring equinox and the Earth's closest approach to the Sun will coincide. Note that, at all times, the tilt of the Earth during the equinox is perpendicular to the imaginary line made by connecting the Sun to the Earth.
And if you measure the shadow cast by a perfectly vertical stick when the Sun is at its zenith , the angle you measure will reveal your precise latitude. On September 22, 2010, skywatchers were treated to the last equinox full moon. The full moon on March 20/21, 2019, will be the last one we'll have until 2029. Here, the Moon is seen rising behind Coit Tower in San Francisco, California.You may remember that two months ago, in January, we received a total lunar eclipse: where the Sun, Earth, and full moon were perfectly aligned.
An illustration of the Sun-Moon-Earth configuration setting up a total solar eclipse. When the Moon's shadow falls on Earth when the nearer-to-the-Sun node aligns, we get a solar eclipse. Conversely, when the away-from-the-Sun node aligns with the Earth-Sun plane, the Moon passes through Earth's shadow and gives us a lunar eclipse. The last eclipse, as of today, was January 20/21, 2019, which was a total lunar eclipse.
There are 59 days between January 21 and March 21, but it takes 88 days to go from maximum alignment to maximum misalignment. So take that measured angular misalignment, divide it by the sin*90°) that occurred from the prior lunar eclipse until today's full moon, and that's the tilt of the Moon's orbit!
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