The Ecliptic Latitude is 0. This is the Ecliptic Latitude. If LO is negative add 180 degrees. LO is the Ecliptic Longitude. F d is the doppler due to the earth's orbit of the sun.
F o is the frequency of interest.
LOS is the Ecliptic Longitude of the Sun. LOE is the given Ecliptic Longitude. LAE is the given Ecliptic Latitude. F o is the frequency transmitted by the source. F d is the doppler shifted frequency.