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We are at the point in the yearly cycle when balance exists between light and dark. The day of the Spring (or Vernal) Equinox has equal times of daylight and darkness.
As the Sun moves from Pisces to Aries, it crosses the Earth's celestial equator, and momentary balance of day and night is achieved. Thereafter, the hours of light will predominate and the hours of dark will fade into the background.
The Equinox, then, is a time for us to examine our own balance. Does a balance exist between our poles of yin and yang, or are we prisoners of images of how we "should" behave? As we move toward our outer nature (the light), do we honor our inner nature (the dark)?
It was Carl Jung that reminded us that without the darkness, we could not see the light of the candle flame.
From The Essene Book of Days by Danaan Parry