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पृथ्वी के पारित : चन्द्रमा का परिक्रमण काल 30 दिन मानकर इसकी पृथ्वी से दूरी ज्ञात कीजिये ।
(पृथ्वी का द्रव्यमान `M_(e)=6xx10^(24)` किग्रा, `G=6.67xx10^(-11)"न्यूटन-मीटर"^(2) //"किग्रा"^(2)`

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माना चन्द्रमा की पृथ्वी से दूरी r है ।
परिक्रमण काल `T=(2pir^(3//2))/(sqrt(GM_(e)))`
अथवा `T^(2)=(4pi^(2)r^(3))/(GM_(e))`
अथवा `r=[(T^(2)*GM_(e))/(4pi^(2))]^(1//3)`
`-[((30xx24xx60xx60)^(2)xx6.67xx10^(-11)xx6xx10^(24))/(4xx(3.14)^(2))]^(1//3)`
`~~4.1xx10^(8)` मीटर

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