[fitswcs] Question about sign convention for VELOSYS

[William Thompson]

A question has arisen about the use of the WCS keywords SPECSYS and VELOSYS for 
solar observations.  The plan is to set SPECSYS='HELIOCEN', and to set VELOSYS 
to the radial velocity of the observatory relative to the physical center of the 
Sun, with a positive value if the movement is toward the Sun.  Is this the 
correct sign convention?

Thank you,

Bill Thompson

-- 
William Thompson
NASA Goddard Space Flight Center
Code 671
Greenbelt, MD  20771
USA

301-286-2040
William.T.Thompson at nasa.gov