[daip] Hour angle calculation

Eric Greisen egreisen at nrao.edu
Wed Mar 9 17:23:25 EST 2005


Andy Biggs writes:
 > Hi there. I've been calculating Hour Angles today for a multi-epoch 
 > dataset. As a check I've been comparing my values with those that AIPS 
 > reports. I've noticed that whilst the x-axis in UVPLT (BPARM = 14,0) gives 
 > results that agree very well with mine, that in SNPLT does not (plotting 
 > with XAXIS=3). Am I misinterpreting Hour Angle in the SNPLT case?
 > 
You are quite right.  The SNPLT used a home brew routine rather than
the one more generally used and someone multiplied the station
longitudes 

STNLON(ANTNO) * 1.002738D0

which is not correct.  It is repaired as of tomorrow in 31DEC05.

Thanks,

Eric Greisen




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