pyacs.lib.units module¶

Various routines dealing with units conversion.

pyacs.lib.units.mas2rad(mas)[source]¶

Converts milliarcseconds to radians

Parameters

mas – angle in millarcseconds

Returns

rad: in radians

Example

>>> import pyacs
>>> pyacs.mas2rad(1.)
>>> 4.84813681109536e-09
>>> pyacs.mas2rad(np.array([1.0,2.0]))
>>> array([  4.84813681e-09,   9.69627362e-09])

pyacs.lib.units.rad2mas(rad)[source]¶

Converts radians to milliarcseconds

Parameters

rad – angle in radians

Returns mas

angle in millarcseconds:

pyacs.lib.units.radians2deg_mn_sec(rad, angle_range='-180-180')[source]¶

Converts an angle from radians to deg, minutes, seconds

Parameters

• rad – angle in radians

• angle_range – either ‘-180-180’ or ‘0-360’

Returns

deg, minutes, seconds

Return type

int,int,float

pyacs.lib.units.moment_to_magnitude(moment)[source]¶

Converts a moment in N.m to Mw

Parameters

moment – in N.m

Return magnitude

2./3.*(math.log10(M0)-9.05)

pyacs.lib.units.magnitude_to_moment(magnitude)[source]¶

Converts a Mw magnitude to moment in N.m

Parameters

magnitude – Mw

Return moment

in N.m, 10^(1.5*magnitude+9.5)