The influential 17th-century astrologer William Lilly states simply: "Planets in angles do more forcibly show their effects.
For example, a person who has Leo on the cusp of their first house and Virgo as their Sun sign can be quite dynamic and dramatic, but the fastidious, efficient, self-effacing part of themself will not be readily apparent until people are able to pierce through the persona and see the real person.
The fourth house, of which the cusp is often (but not always) the Imum Coeli, signifies a person's home, security, family, and those things in early life that served as a foundation for them.
The seventh house, of which the cusp is often (but not always) the Descendant, shows the type of mate the native is likely to be attracted to and all partnerships in general.
[2] The tenth house, of which the cusp is often (but not always) the Midheaven, refers to our careers, vocations, creative output, and how we would like the world to see us.