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$\begin{displaymath}\Delta\alpha = (50.37'' (\cos\epsilon + \sin\epsilon \sin\alpha \tan \delta) - 0.11'') \Delta t(year) \end{displaymath}$

(1)

$\begin{displaymath}\Delta\delta = 50.37''(\sin\epsilon \cos\alpha) \Delta t(year) \end{displaymath}$

(2)