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60
Function Keys
Hours, Minutes, Seconds
The
I
+H.MS
1
(to
hours
,
minutes, seconds)
key
converts
decimal
hours to
the format of
hours
,
minutes
and seconds
.
To see the
digits
for
seconds,
you should specify FIX
4 display format.
Forexample,
to convert
12.56
hours
to
hours,
minutes,
seconds:
Press
Display
12.56
D
~4
D
I
+H.MS
I
112.56
112.5600
112.3336
Decimal hours.
Sets
display
format.
This
is read
as
12 hours, 33
minutes
,
36 seconds
.
Conversely,
the
EEl
(to
decimal hours) key is
used to change
hours, minutes,
seconds
into decimal hours.
For example, to
convert
12 hours
,
33 minutes,
36 seconds
back into decimal
hours:
Press
Display
112.5600
Decimal
hours.
Hours to hours, minutes
,
seconds
conversion is
accurate
to
10-
5
decimal
hours
.
The
EEl
and
1
+H.MS
I
keys also
permit
you
to change
degrees,
minutes, seconds to
decimal degrees
,
and
vice
versa
.
For
example
,
to
change
137°45' 12" to decimal
degrees:
Press
Display
137.4512
D
EE]
1137.4512
1137.7533
Decimal degrees.
The
conversion
is
important because trigonometric
function
s
in
the
H P-25 operate
on
angles
in
de
cimal
de
gree
s,
but
not in
degrees,
minutes, seconds
.
In order to
calculate any trigono-
metric functions
of an angle given
in
degrees
,
minutes, seconds,
you
must first
convert
the
angle
to decimal degrees
.
Example:
Lovesick sailor
Oscar
Odysseus
dwells
on
the island
of Tristan
da
Cunha
(37°03
'
S, 12°18'W), and
his
sweetheart,
Penelope,
lives on
the nearest island
.
Unfortunately for the
course of
true love
,
however,
Tristan
da
Cunha is
the most
isolated inhabited spot in the
world.
If Penelope lives
on the
island
of St. Helena
(15°55'S, 5°43'W)
,
use
the
following
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