The vernal equinox is the first day of spring (occurring when the North Pole begins to lean toward the sun). The autumnal equinox is the first day of autumn (occurring when the North Pole leans away from the sun).
The beginning of fall in the Northern Hemisphere is marked by the autumnal equinox, which occurs around September 22 or 23 each year. This event signifies the point when day and night are approximately equal in length. As the equinox approaches, temperatures typically begin to cool, and many trees start to change color, signaling the transition from summer to fall.
winter solstice
The fall equinox occurs around September 22 or 23 in the northern hemisphere. This marks the beginning of autumn when day and night are roughly equal in length.
it receives signals and sends out signals
Depends whether you are in northern or southern hemisphere. These days are when the sun passes over the Equator on its way to the other hemisphere's new season. Vernal is spring, Autumnal is autumn. Because of the conspicuity of the autumn colours in N America, Fall has real meaning there. In my country only two trees are deciduous.
autumnal equinox
Vernal
In 1948 Franklin Roosevelts new deal coalition was beginning to fall apart.
The beginning of fall in the Northern Hemisphere is marked by the autumnal equinox, which occurs around September 22 or 23 each year. This event signifies the point when day and night are approximately equal in length. As the equinox approaches, temperatures typically begin to cool, and many trees start to change color, signaling the transition from summer to fall.
autumnal equinox
There is many different signals for many different frogs. Can you be more pacific?
Pituitary or Hypophysis
The spring equinox
the vernal equinox
Summer Solstice (A+ Anywhere)
winter solstice
a Noun Clause... I am on the same test.