Monthly report for March 2003 by Christian A. Hummel:

Hummel implemented a procedure in the NPOI photometry analysis
to account for the APD non-linearity as measured a few months
ago. The inconsistencies in the photometric scans are only for
the brightest stars. He also correlated the total NAT and white
light spectrometer counts and found considerable scatter in some
recent nights.

Hummel spend some time answering questions from our Japanese visitor
at NPOI related to NPOI data reduction. 

Hummel updated the orbit of Zeta Orionis with the new 6-station
data obtained last December.

Together with Jim Benson, Hummel analysed test observations with
the new constant term metrology system.