Earth rotates on it's axis, however relative to the rotation earth is not standing straight up. Precession is essentially the opposite of when a spinning top falls over. On a small scale, as a top slows down and gravity takes effect it begins to tip over. Precession has the opposite effect on earth, as gravity from the sun and moon pull earth to a more upright position (still relative to the rotation). Because the common points of interest in the sky are located using earthly clues, as the rotating axis changes the location of these points also changes when viewed from earth. As far as I understand it doesn't happen very quickly, with one cycle taking 26,000 years. This is why Hipparchus noticed a difference not between his own observations, but between his observation and those recorded much earlier.
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One of the my biggest nightmares is coming true with the widespread ignoring of science in the ongoing climate change debate. On that note, I do think it is everyones duty to be aware of, or at the very least, not to ignore proven and accepted scientific
One of the my biggest nightmares is coming true with the widespread ignoring of science in the ongoing climate change debate. On that note, I do think it is everyones duty to be aware of, or at the very least, not to ignore proven and accepted scientific