Less than two months earlier, Tucker had begun a systematic program he calls HELIOS (High Ecliptic Latitude
Interplanetary Object Search), which looks for asteroids and comets that cross Earth's orbit.
The European Space Agency's Ulysses spacecraft arched over the Sun's south polar region from late June through early November of last year, reaching a southernmost ecliptic latitude of 80 [degrees] .
Although CMEs start out from the Sun with speeds that are fairly independent of latitude, those detected by Ulysses at far southerly ecliptic latitudes are moving much faster than those encountered here on Earth.
Certain angles might be more easily found over others when looking at a small range of ecliptic latitudes
In 1982 in the Publications of the Astronomical Society of the Pacific, he presented a new argument: that the Almagest's errors in the ecliptic latitudes
of stars vary sinusoidally around the ecliptic in a manner that could have arisen if Ptolemy stole Hipparchus's star catalog and applied an inadequate precession correction.