An astrological technique that consists in casting two or more persons’ natal charts to assess their compatibility and analise the dyamics of a relationship.

This term refers to the person whose natal chart is cast.

A birth chart was called, until recently, nativity.

The point in a planet’s orbit where it it most distant to the Sun. The opposite point, where it is closest to the Sun, is called Perihelion.
The aphelion of the Earth occurs about 4th July each year.