No. The equinox happens twice a year, when the Earth is at two specific points in its orbit around the sun. The two equinoxes are around March 21st and September 21st, the halfway points between the summer and winter solstice's. Its when the earths axial tilt is parallel to its orbit, the north and south poles are neither away or pointing towards the sun, so day and night lengths are equal.
From equinox to equinox, the orbit is 365.2425 * 24 hours (approx)
Orbit
Orbit
It is called an orbit
Orbit
Its the orientation of the earths rotational axis that defines the equinox, the axis remains parallel throughout the orbit of the sun, and when its side on to the sun (spring and autumn), thats the equinox (equal length of day and night).
Ecliptic.
Procession of the Equinox
REVOLUTION
that earths orbit is elliptical
Earths Orbit? Earths Orbit?
The Earth's journey around the sun is called its orbit.