In which constellation does the vernal Equinox appear?

The constellation where the vernal Equinox appear is Pisces. In the Northern Hemisphere the vernal Equinox falls about March 20 or 21, as the Sun crosses the celestial equator going north. In the southern hemisphere, the vernal Equinox corresponds to the center of the Sun crossing the celestial equator moving southward and occurs on the date of the northern autumnal Equinox. The vernal equinox marks the first day of the season of spring.

Pisces is an equatorial constellation, lying immediately south of Andromeda and north of Cetus. It appears highest in the evening sky in the months around September. It is one of the faintest of the ancient constellations, containing no stars brighter than magnitude 3.6. It is now also widely known by scientific experts that the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal Equinox or spring Equinox) which appears in the Pisces constellation. September 22 is the autumnal Equinox.