The purpose of angle2hms is to facilitate comparison of
rightAscension angles computed by
with angles reported in astronomical sources and software, which
often employ an hour-minute-second notation. In that notation,
decimal hour is computed as 24/360 times the angle in degrees,
and from that decimal hour are compute integer hour and minute
values, plus a decimal second value. It is common in the
astronomical literature to use strings to represent the results,
11^h40^m48^s.10 for the
value used in the “Examples”; see Chapter 1 of
Meeus (1991) for more on angle calculation and representation.
numerical value giving an angle in degrees
angle2hms returns a list containing
time (a numerical value for decimal hour, between 0 and 24),
second (the last of which may have a fractional
string, a character value indicates the time in hour-minute-second
notation, with the second part to two decimal places and intervening
s characters between the units.
Meeus, Jean. Astronomical Algorithms. Second Edition. Richmond, Virginia, USA: Willmann-Bell, 1991.
Other things related to astronomy:
# A randomly-chosen example on page 99 of Meeus (1991). angle2hms(177.74208) # string component 11h50m58s.10
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