[udf-dlm-develop] start_AZ

[Steve G. <ge...@ss...>]

  >3. Every data structure contains [START_AZ and STOP_AZ]

These are the starting and stopping azimuth angle of the
instrument, as of the time the data was taken.  

Chris has the official offset angle from Spacecraft +X
to each instrument.  Knowing the spin rate, he can calculate 
an instrument azimuth for any given time.

Because FUV does time-delayed-integration (TDI), these azimuths
don't mean much for image data, but the could be of some use
for housekeeping.