What is the "vernal equinox" in the Solar System?

The "vernal equinox" is a point in the constellation Fish where the celestial equator crosses the ecliptic and where the Sun is located on March 21 (the first day of spring in the northern hemisphere). You can proof this definition in AstroViewer's solar system map when you set the date to March 21. At that date, the Sun is in the direction of the vernal equinox, seen from the Earth.

Then switch to the sky map and activate the celestial equator and the ecliptic. You will find the Sun at the point where both lines cross each other in the constellation Fish. The vernal equinox is generally accepted reference point for astronomical coordinates.

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