
Today at 15:44 UT (GMT) the earth achieve that moment of balance that occurs each spring and fall.
When and why the fall equinox happens:
The seasons of the year are caused by the 23.5° tilt of the earth's axis. Because the earth is rotating like a top or gyroscope, it points in a fixed direction continuously -- towards a point in space near the North Star. But the earth is also revolving around the sun. During half of the year, the southern hemisphere is more exposed to the sun than is the northern hemisphere. During the rest of the year, the reverse is true. At noontime in the Northern Hemisphere the sun appears high in the sky during summertime and low in the sky during winter. It is highest at the summer solstice (about June-21) and lowest at the winter solstice (about December-21). The half-way points in the year are called the equinoxes. It is time of the year when the sun rises exactly in the east, travels through the sky for 12 hours, and sets exactly in the west. 1,2 Everywhere on earth experiences close to 12 hours of daylight, and 12 hours of nighttime.
Crystalinks gives a good round-up of Autumnal Equinox observances from around the world, and offers this more general advice.
There are those who believe the equinox solar affect produces a reduction in the magnetic field of the Earth, providing easier access to other dimensions beginning around 24 hours before, and ending around 24 hours after the exact Equinox point.
Doorways or thresholds into the mysteries are more easily accessed during equinoxes and when we consciously engage this timing we are taking advantage of the opportunity to further activate our own experience of these sacred timings and what they have to offer us. This is a great time to be on the land, in a power spot that calls to you, whether that is in a forest, near a body of water, on a mountain, in a sacred site or in your back yard. What is important is to create the time and space that supports a direct experience of the mysteries that are ready to reveal themselves to you.