What is meaning of Vertex of Great Circle ?

cos lat V                               =             cos lat A               x              sin A

circle
Using Napier’s Rule:   

sin mid part = product of tan of adjacent parts

sin (co – PA)             =       tan (co – P)       x       tan (co – A)

cos PA                          =       cotan P    x       cotan A

tan P                            =                          1                

                                                  sin lat A x       tan A

circle 1

manish-mayank

 

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