The following aspect interpretations apply only to natal or birth charts. Please see Synastry aspects for comparison charts, and Interpreting transits for transit aspects.
Those with Mercury sextile Midheaven (and thus trine the Imum Coeli) are usually reputed to be intelligent. Though this isn't necessarily true, what they are good at doing is using their communication skills to appeal to a wider audience. This can sometimes translate into job success, as they are sought out for their perceived ability to pass on a message. Their home environment is quite admirably suited to this purpose; they probably have easy access to libraries or other repositories of knowledge. They enjoy passing information on to their children or other close family members.