HP HP-11C - Time and Angle Conversions

46 Section 3: Numeric Functions
To use any of the trig functions, ensure that the calculator is set to
the desired trig mode ([DEG], [RAD], or [GRD]), then execute the
desired trig function.
Keystroke .
To Calculate Example Display
(Examples assume
trig mode.)
All Trig functions, for
example:
Sine 33.5 33.5
SIN 0.5519
Arc Sine .7982 0.7982
52.9586
Time and Angle Conversions
Numbers representing time or angles are interpreted by the
HP-11C in a decimal or minutes-seconds format, depending upon
the conversion being executed:
Hours.Decimal Hours Hours.Minutes Seconds Decimal Seconds
(H.h) (H.MMSSs)
or
Degrees.Decimal Degrees Degrees.Minutes Seconds
(D.d) Decimal Seconds
(D.MMSSs)
Hours (or Degrees), Minutes, Sec-
onds Conversion. Pressing
converts the number in the
displayed X-register from a decimal
hours (or decimal degrees) format to
an hours (or degrees), minutes, sec-
onds, decimal seconds format.
H.h — H.MMSSs
or
D.d — D.MMSSs