# Differences

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why_does_the_rate_of_change_of_day_length_vary_and_why_it_is_greatest_at_the_equinox 2008/10/08 09:03 why_does_the_rate_of_change_of_day_length_vary_and_why_it_is_greatest_at_the_equinox 2009/01/16 10:25 current
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-Dear Nick,
The rate of change of the length of the day is not constant but rather sinusoidal. The main reason for this effect is that the Earth's axis is tipped over about 23.5° from vertical. This produces that the fraction of the 24 hour day that a person in a given location of the earth spends on the lit up portion of the earth changes along the year. The rate of change of the length of the day is not constant but rather sinusoidal. The main reason for this effect is that the Earth's axis is tipped over about 23.5° from vertical. This produces that the fraction of the 24 hour day that a person in a given location of the earth spends on the lit up portion of the earth changes along the year.