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The first day of spring in the Northern Hemisphere was once marked by the zero point of the Zodiac. Astronomers call this the vernal equinox and it occurs as the ecliptic and celestial equator intersect on approximately March Around B. Unbeknownst to the ancient astrologers, Earth continually wobbles around its axis in a 25,year cycle.
This wobble — called precession — is caused by the gravitational attraction of the moon on Earth's equatorial bulge. Over the past two-and-a-half millennia, this wobble has caused the intersection point between the celestial equator and the ecliptic to move west along the ecliptic by 36 degrees, or almost exactly one-tenth of the way around, to the border of Pisces and Aquarius.
This means that the signs have slipped one-tenth — or almost one whole month — of the way around the sky to the west, relative to the stars beyond.
For instance, those born between March 21 and April 19 consider themselves to be Aries. Today, the sun is no longer within the constellation of Aries during much of that period.
From March 11 to April 18, the sun is actually in the constellation of Pisces! The table below lists the dates when the sun is actually within the astronomical constellations of the Zodiac, according to modern constellation boundaries and corrected for precession these dates can vary a day from year to year.
Just because the dates are different from the ones you use doesn't make your sun sign invalid. You need to decide which method of determining your sun sign you wish to use and then stick with it. Regardless what the current range of dates are, the only important thing is what the range was at the time of your birth.
That determines your true sun sign. To find this out, you can use an ephemeris to reveal the beginning and ending dates for each sign. An ephemeris derived from Greek word ephemeros which means daily is a table that lists the positions of the stars and planets at any given moment in time. With astrology computer programs wide-spread, these have been pared down to simply typing in a date and receiving your sun sign.
Once you know your zodiac sign dates, it's easy to follow your daily, weekly, monthly , and annual horoscope predictions.
Your sign is determined by the date of your birth. An ephemeris helps you determine your sun sign.
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