Reading the table
The antiscium is a zodiac position reflected across the Cancer–Capricorn solstice line. A planet at 10° Aries has an antiscium at 20° Virgo. The contra-antiscium is opposite that point, at 20° Pisces. The calculator gives both coordinates for each body and lists pairs whose mirrored longitude lies close to a different body's original longitude.
These contacts use an exact angular difference around the 360° zodiac; the chosen orb sets how close a pair must be. The same reciprocal pair is listed once. A contact is a feature of a symbolic coordinate system, not a physical conjunction of two bodies in the sky. Check the method guide before attaching an interpretation.