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The March equinox [7] [8] or northward equinox [9] is the equinox on the Earth when the subsolar point appears to leave the Southern Hemisphere and cross the celestial equator, heading northward as seen from Earth.
It is only after a complete Gregorian leap-year cycle of 400 years that the seasons commence at approximately the same time. In the 21st century the earliest March equinox will be 19 March 2096, while the latest was 21 March 2003. The earliest September equinox will be 21 September 2096 while the latest was 23 September 2003 (Universal Time).
The first point of Aries, also known as the cusp of Aries, is the location of the March equinox (the vernal equinox in the northern hemisphere, and the autumnal equinox in the southern), used as a reference point in celestial coordinate systems. In diagrams using such coordinate systems, it is often indicated with the symbol ♈︎.
Diagram showing the westward shift of the March equinox among the stars over the past 6,000 years. As seen from the brown grid, 5,000 years ago, the March equinox was close to the star Aldebaran in Taurus. Now, as seen from the yellow grid, it has shifted (indicated by the red arrow) to somewhere in the constellation of Pisces.
The equinox occurs at 5:24 p.m. EDT Monday, March 20, the latest start to astronomical spring since 2019. This differs from meteorological spring, which beings on March 1 every year.
The origin is the Sun's center, the plane of reference is the ecliptic plane, and the primary direction (the x-axis) is the March equinox. A right-handed rule specifies a y-axis 90° to the east on the fundamental plane. The z-axis points toward the north ecliptic pole. The reference frame is relatively stationary, aligned with the March equinox.
The March equinox is slated for 11:06 p.m. on Tuesday, March 19 and refers to the time that the sun moves across the Earth's equator, going from south to north, according to EarthSky. The March ...
In 2024, the March equinox will occur on Tuesday, March 19, at 11:06 P.M. EST. If you happen to reside in the Northern Hemisphere, this date will also mark the start of the spring season. But if ...