Downward sloping line of 13 months
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As you look at from the figure, the down ward sloping linear line of the 13 month shows that it varies from the reality of about the constant function of 12 months. Moreover the variance of 13 months concept is about 42 days, and its standard deviation is also about 6.48 days. these high variations confirm that the 13 months concept in a solar year is statistically awkward.
