Sun square or opposite Mercury

A square or opposition between the Sun and Mercury cannot occur. Mercury's greatest elongation is about twenty eight degrees, well short of the ninety needed for a square, and the two bodies are never on opposite sides of the chart. The entry exists so the pairing is not read as missing. Charts that appear to show it have been cast with faulty data or are using a different point named Mercury. For the tension between identity and mind, readers should look instead at Mercury's aspects to Saturn, Uranus or Neptune, which supply the friction the Sun cannot.