FrequentlyAskedQuestions

Q.

What does this warning mean?

      Tue Sep 25 20:50:10 2007      WARN MeasIERS::fillMeas(MeasIERS::Files, Double) (file /usr/src/redhat/BUILD/casapy-svn-20.0.3022/code/measures/implement/Measures/MeasIERS.cc, line 94):
Requested JD56099.1 is outside the IERS table data range
Calculations will proceed with less precision
Tue Sep 25 20:50:10 2007      WARN MeasTable::dUT1(Double) (file /usr/src/redhat/BUILD/casapy-svn-20.0.3022/code/measures/implement/Measures/MeasTable.cc, line 6437):
No requested dUT1 data available from IERS tables. 
Proceeding with probably less precision.
Tue Sep 25 20:50:10 2007      WARN MeasTable::PolarMotion(Double) (file /usr/src/redhat/BUILD/casapy-svn-20.0.3022/code/measures/implement/Measures/MeasTable.cc, line 6265):
No requested polar motion data available from IERS tables. 
Proceeding with probably less precision.
      

A.

almasimmos tries to find the Earth's rotation parameters in a lookup table, but unfortunately the table does not extend very far into the future. It can't, because events like earthquakes, glacier calvings, or everyone in one hemisphere simultaneously jumping could cause glitches in the Earth's rotation. However, such glitches tend to be very small, and almasimmos continues, issuing a warning each time a table lookup fails. Ignore the warning(s).

1. Q.: I get "Device or Resource busy" errors and complaints about .NFS******** locks when I try to remove files. What should I do?

   A.

   Go to that directory using a different computer and rm the stuff you want to zap. Alternatively, Joe McMullin suggests moving the offending file (rename it) and then deleting it, but that didn't work for me.