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EQUINOX. The name given to two periods of the year when the days and nights are equal; that is, when the space of time between the rising and setting of the sun is one half of a natural day. Dig. 43, 13, 1, 8. Vide Day.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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"The Fall Equinox represents a dramatic change of where the sun is traveling," stated Richard Dowdy, co-owner and the firm's COO and editor.
From our simulation modeling, the equinox is the optimal time in our area (Central Illinois) to cover (spring equinox) and uncover (fall equinox) the clerestories.
He discovered that smallmouths start their fall movements one week after the fall equinox. And it appears to begin at this same time right across the northern range, regardless of latitude, water temperature, moon phase, or anything else.
Ramadan has come at a time of the Fall Equinox in Canada where the daylight hours stretch out in some places, to 15 exhausting hours.
The fall equinox begins autumn in the northern hemisphere-the moment when the sun appears to cross the celestial equator and day and night are of approximately equal length.
In short, depending on where you live, some believe the second full moon after the fall equinox, which occurs on different dates from year to year, determines the timing of the rut.
His destination on the fall equinox was the Altar of the Moon, in the west quarter of Beijing.
It's the film your uncle Frank, who never goes to the movies anymore (are you kidding, with ticket prices these days?), will go and see and rave about until the fall equinox. Edgy?
But for a moment, we rest in that sweet spot between the summer solstice and the fall equinox.
They knew when hours of light and dark would be even: 12 of each in spring and fall equinoxes. After the fall equinox, they sensed the power of darkness as the night steadily lengthened and the day got shorter.
CARBONDALE -- Come celebrate the fall equinox with Southern Illinois Pagan Alliance, Saturday, Sept.
The one in September is known as the autumnal equinox or fall equinox. On both the equinoxes, daylight and darkness last for equal duration.