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Autumnal Equinox
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The location of the first point of Libra is not fixed due to the phenomenon of axial precession, a slow, conical wobble of the Earth's rotational axis with a period of approximately 25,772 years. Because of this wobble, the vernal equinox point (the spring equinox) currently resides in the constellation Pisces, although it is still conventionally defined relative to the coordinates of the constellation [Libra](/e…
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Precession Of The Equinoxes
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Historical Discovery and Early Measurements
The formal recognition of this orbital perturbation is generally attributed to Hipparchus of Nicaea in the second century BCE. Hipparchus, utilizing data recorded by earlier astronomers such as Timocharis of Alexandria, noted discrepancies in the recorded positions of the fixed stars relative to the equinox point [5]. By compa…