"I have Neptune in transit opposing or squaring Mercury in the birth chart. What is involved ?" What can it mean to have bad form Neptune aspects such as quadrature and opposition with our natal Mercury ? What a way to give an unfavorable passage of Neptune on the planet Mercury in our birth chart ? What does it mean to have the planet Neptune square or opposed natal Mercury ? The transit of Neptune quadrature and opposition to natal Mercury which carries positive connotations for us ? Which are meaning, significance, sense of the planet Neptune in transit in square or opposition at the birth Mercury ? Having this planet in bad aspect and then square (90 degrees) or that form an opposition (180 degrees) with the planet Mercury can bring important significance not only on a personal level. Let's say, however, that not take into consideration the position of Mercury in the 12 astrological houses and then Neptune transiting Mercury which is in I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII house. This is because Neptune is a generational planet, and therefore its influence rather than on the individual and therefore on its areas of life takes place and acts on an entire generation, an entire community.
Meaning : if you have a job or work related stuff and cash equivalents at sea be very careful because a mistake could be made by you in these areas. Be safe by driving especially on wet roads. Some of your close relatives might have serious mental disorders, neurotic. Do not supposed to drive if you have been drinking.