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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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Cyril Pedrosa follows up his well-regarded graphic novel Portugal with the ambitious and beautifully drawn Equinoxes, which combines the distinct stories of several modern-day individuals, and the wordless tale of a boy living thousands of years before, into a transcendent mosaic that exceeds the sum of its parts.
There are two equinoxes in a year, the other is called vernal equinox, which happens in March.
The true equinox moments and the equivalent moments when the Moon, Mars, Venus or Mercury intersect the celestial equator (called here, by analogy, "planetary equinoxes") were determined by nonlinear interpolation of the data tabulated in the annual astronomy tables [4]; the residual error of this interpolation was much within the time resolution of our observations.
Saturn experiences two equinoxes per orbit, just as Earth does, when the planet's equator lines up edge-on to its orbital plane, causing the sun to appear directly over the equator.
Not every culture counted four seasons, however, or measured them by solstices and equinoxes. In ancient Egypt, the Nile River divided the year into three seasons: Inundation, Planting and Growth, and Harvest and Low Water.
The more accurate tropical year -- the average time between successive vernal equinoxes -- is roughly 365.2422 days.
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.
Equinoxes are the only two times a year when the sun rises due east and sets due west.
There are two equinoxes in a year, with the vernal equinox on March 21, which signaled the summer season.