- Autumn Meridian
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Autumn Meridian is a part of the equinox meridiator that passes through First point of Libra and has celestial longitude 180° (±180°) (12h).
There are alternative names: Noon Meridian, First point of Libra Meridian, Virgo Meridian, September Meridian, Fall Meridian, celestial End Meridian, celestial Antimeridian, and Autumnal Meridian.
Autumn Meridian lies in the middle of the celestial map and is the opposite or to the other side of the celestial sphere of the Spring Meridian.
The sun passes through this meridian on September 22 or 23 traveling from northern to southern hemispheres and eastern to western hemispheres along the ecliptic. Though, Autumn Meridian divides into two celestial hemispheres into western hemisphere to the east and eastern hemisphere to the west.
Because during the second half the year from summer to winter, these meridional constellations are not visible due to exposure to daylight of the sun. There are the following list of constellations from north celestial pole to south celestial pole.
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