Astrology pattern for early July, 2017. Mercury changes signs, entering Cancer. Mercury separates from Mars, but only for a week: Mars enters Cancer on July 11, again joining Mercury. Mars is debilitated in Cancer. Mars in Cancer has important effects on Astrology Chart of Donald Trump. The Full Moon on July 8 will be conjunct Pluto and opposed by Mars, indicating high energy for Destruction and Rejuvenation.