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in the precession cycle, the earth's axis wobbles about the normal of the earth's orbit, so that the timing of the seasons shift around relative to the timing of perihelion and aphelion.
in the precession cycle, the earth's axis wobbles about the normal of the earth's orbit, so that the timing of the seasons shift around relative to the timing of perihelion and aphelion.
it also increases the annual average insolation in the southern middle and high latitudes and reduces it in the northern middle and high latitudes, because the increase in solar insolation at perihelion relative to aphelion is in proportion to the solar insolation recieved at the time of year at the latitude considered, so the increase in insolation at perihelion is closer to the winter solstice cannot fully make up for the decrease at aphelion when aphelion is closer to the summer solstice.
it also increases the annual average insolation in the southern middle and high latitudes and reduces it in the northern middle and high latitudes, because the increase in solar insolation at perihelion relative to aphelion is in proportion to the solar insolation recieved at the time of year at the latitude considered, so the increase in insolation at perihelion is closer to the winter solstice cannot fully make up for the decrease at aphelion when aphelion is closer to the summer solstice.
