Evaluate
\frac{\pi }{15778800}\approx 0.000000199
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\frac{\pi }{24\times 365.25\times 1800}
Cancel out 2 in both numerator and denominator.
\frac{\pi }{8766\times 1800}
Multiply 24 and 365.25 to get 8766.
\frac{\pi }{15778800}
Multiply 8766 and 1800 to get 15778800.
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