HP HP-21 - Page 47

Method: Enter degrees, minutes, seconds as a decimal; for
example, 21° 18’ is computed as:
18
21° 18 = 21 + — = 21.30°
60
For ease of computation, all minutes have been converted to
decimal degrees in the following equations.
The equation for the distance to Honolulu is:
cos™! [(sin 45.62°) (sin 21.30°) + (cos 45.62°) (cos 21.30°)
cos(157.87°—150.20°)] x 60
Slide oec [[[[ljr2c switch to Degrees:
S~
Press Display
157.87
150.20 [9)
e [[0.99
21.30 []
45.62 [x]
45.62 EI3
21.30 BN (%]
E
60 [x] Distance from Queequeg’s
position to Honolulu,
Hawaii.
The equation for the distance to Anchorage is:
cos™! [(sin 45.62°) (sin 61.22°) + (cos 45.62°) (cos 61.22°)
cos (149.90° —150.20°)] x 60
Press Display
149.90
150.20 [9)
61.22 B[]
45.62 ER ]
45.62 EN 0.71