September 2021 Autumn Equinox, Moon Phases, and More!

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September 2021 Moon Phases, Meteor Showers, Autumn Equinox, and More Astronomical Phenomena and Astronomy Calendar at WildHemlock.Com

Are you ready for fall? It’s coming in September 2021. I can’t wait to watch the leaves change colors and to dig my sweaters out of my closet. September 22nd is the first day of Astronomical Autumn, or the Autumn Equinox. September 1st is the first day of Meteorological Fall, while Labor Day on September 6th marks the unofficial end of Summer in the United States. The Autumn Equinox is defined as:

The intersection of the celestial equator and the sun’s ecliptic pathway in it’s southern descent towards the tropic of Capricorn. At this time, the Earth’s axial tilt is facing neither toward nor away from the sun, and there is approximately 12 hours of daylight and nighttime (at the equator).

The Celestial Sphere. Learn more about it and other astronomy facts at WildHemlock.Com!
The Celestial Sphere from the US Gov via Wikipedia

This sounds technical, but it only means that during the Earth’s uneven orbit, it is halfway between its high point and its low point. The sun is directly shining on the Equator, in the middle. During its high point, the Summer Solstice, the sun is most powerful on the Tropic of Cancer in the Northern Hemisphere. During its low point, the Winter Solstice, the sun’s most direct rays are on the Tropic of Capricorn in the Southern Hemisphere. During the Vernal (Spring) and Autumn (Fall) Equinoxes, the Equator experiences 12 hours of daylight and 12 hours of night time.

Meteorological Seasons, on the other hand, are based on the calendar. According to NOAA, meteorological seasons are the result of research into climate and weather history. September, October, and November have more similar weather patterns than September 22nd – December 21st. Additionally, these seasons better match our current calendar.

The closest Full Moon to the Autumn Equinox is known as the Harvest Moon. The Harvest Moon typically appears brighter, larger, and orange-tinted. The moon rises much quicker than usual, leading to a bright night that farm workers can utilize to continue the Harvest into the evening. According to EarthSky, this happens because the Moon has the lowest orbit of the year as viewed from the Earth. The atmosphere is thicker and more water saturated near the horizon, which causes the Moon to appear larger and red orange.

More Highlights for September 2021:

  • Autumn Equinox on September 22nd
  • Aurigids Meteor Shower on Sept 1st
  • Eta-Perdeids Meteor Shower on Sept 9th
  • Neptune at Opposition on Sept 14th
  • Harvest Moon on Sept 20th
  • Sextantids Meteor Shower on Sept 27th

And there’s plenty more! Check out the Glossary of Astronomical Events if you need any explanations.

Astronomical Seasons

Autumn Equinox - Learn More at WildHemlock.Com
Autumn Equinox

First Day of Fall in the Northern Hemisphere!

September 22nd, 2021

Moon Phases

New Moon

September 6th
First Quarter Moon

September 13th
Full Moon

Harvest Moon

September 20th
Third Quarter Moon

September 28th

All times are in Eastern Standard Time (EST) or Eastern Daylight Savings Time (EDT).


Moon Facts

Moon. Learn more about lunar phenomena and moon phases at WildHemlock.Com
Perigee:11th
Descending Node:12th
Apogee:26th
Ascending Node:26th
Moon Name:Harvest Moon, Corn Moon



Meteor Showers

Learn more about Meteor Showers at WildHemlock.Com
Perseus Constellation thanks to Wikipedia. Learn More at WildHemlock.Com

Aurigids Meteor Shower

Radiant Point:Auriga Constellation
Peak Date:September 1st
Best Time, EST:10 – 11 PM
Direction to Look:North Northeast, low to the horizon
Learn More:Sky At Night Magazine
Image from IAU and Sky & Telescope Magazine, via Wikipedia

Perseus Constellation thanks to Wikipedia. Learn More at WildHemlock.Com


ε-Perseids Meteor Shower

Radiant Point:Perseus
Peak Date:September 9th
Best Time, EST:5 – 6 AM
Direction to Look:Northwest
Learn More:In The Sky.Org
Image from IAU and Sky & Telescope Magazine, via Wikipedia

Sextant Constellation, Learn More at WildHemlock.Com

Sextantids Meteor Shower

Radiant Point:Sextant
Peak Date:September 27th
Best Time, EST:4 – 6 AM
Direction to Look:Southwest
Learn More:In The Sky.Org
Image from IAU and Sky & Telescope Magazine, via Wikipedia

* For the East Coast of the United States

Planetary Alignments

Mercury

Greatest Eastern Elongation

September 13th

Ideal time to view planet
Neptune Symbol by Wild Hemlock. Learn more about astronomy at WildHemlock.Com Neptune

Solar Opposition

September 14th

Ideal time to view planet
Mercury

Enters Retrograde

September 27th

Associated with folklore

Lunar Conjunctions

Moon. Learn more about lunar phenomena and moon phases at WildHemlock.Com
Mercury & the Moon Symbol by Wild Hemlock. Learn more about astronomy at WildHemlock.Com Mercury

Lunar Conjunction

September 8th
Venus

Lunar Conjunction

September 9th
Saturn

Lunar Conjunction

September 16th
Jupiter

Lunar Conjunction

September 18th
Uranus & the Moon Symbol by Wild Hemlock. Learn more about astronomy at WildHemlock.Com Uranus

Lunar Conjunction

September 24th

September 2021



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