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measures.epoch - Function

1.4.1 define an epoch measure


Description

epoch defines an epoch measure from the CLI. It has to specify a reference code, an epoch quantity value (see introduction for the action on a scalar quantity with either a vector or scalar value),

and optionally it can specify an offset, which in itself has to be an epoch. Allowable reference codes are: UTC TAI LAST LMST GMST1 GAST UT1 UT2 TDT TCG TDB TCB.
Note that additional ones may become available. Check in CASA with:

print "\t----\t epoch Ex 1 \t----"  
print me.listcodes(me.epoch())  
#{’normal’: [’LAST’, ’LMST’, ’GMST1’, ’GAST’, ’UT1’, ’UT2’, ’UTC’, ’TAI’,  
# ’TDT’, ’TCG’, ’TDB’, ’TCB’, ’IAT’, ’GMST’, ’TT’, ’ET’, ’UT’], ’extra’: []}  
#

See quantity for possible time formats.

Arguments





Inputs

rf

reference code

allowed:

string

Default:

UTC

v0

epoch value

allowed:

any

Default:

variant

off

optional offset epoch measure

allowed:

record

Default:

Returns
record

Example

 
 
print "\t----\t epoch Ex 2 \t----"  
print me.epoch(’utc’,’today’)  
#{’m0’: {’value’: 54048.861237743055, ’unit’: ’d’},  
# ’refer’: ’UTC’,  
# ’type’: ’epoch’}  
 

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