Why are the solutions different?

[tom234]

I am comparing the answers of the same equation between HP Prime G2 and HP27S.
I am entering a formula for distance between points using:
"
//MATH
//COS A = SIN LT1 SIN LT2 + COS LT1 COS LT2 COS(LG1-LG2)
//DISTANCE=C*ACOS(SIN(HRS(LT1))*SIN(HRS(LT2))+
// COS(HRS(LT1))*COS(HRS(LT2)) *(HRS(LG1)-HRS(LG2)))

// 1 DEGREE OF ARC = 60 NAUTICAL MILES = PI X D/360 STATUTE MILES
// WHERE D IS THE DIAMETER OF THE EARTH, 7917.59
//DEGREES.MINUTESSECOND FORMAT(D.MM.SSss)
//EAST LONGITURDE ARE NEGATIVE NUMBERS. THE CALCULATOR MUST BE IN DEGREE MODE.

// WHERE C IS CONSTANT:
// C= 60 TO COMPUTE NATICAL MILES.
// C=69.0940 TO COMPUTE STATUTE MILES.

"N.B.
When I enter the equation below into the Solver I get the answer:2,434.2929Statute Miles. The same answer if I ented the for PPL program.
HMS-> entry goes to decimal form.
D=69.094*ACOS(SIN(HMS→(40.35))*SIN(HMS→(44.35))+COS(HMS→(40.35))*COS(HMS→(44.35)​)*COS((HMS→(75.1)-HMS→(123.16))))"

However, when I use My HP27s I get 2,426.9794 Statute Miles. This is correct for the formula backed up by my HP27s text.
This discrepancy or difference in the answer is quite distressing.

"wish PPL was QB/QuickC which one could program in a language of their choice...just trying to learn this program It's me I have to adapt.
If anyone can figure this out please help is required....could it be the calculator...
PS I am in degree mode.
Thank You for your help, your attention to this matter would be greatly appreciated.