Definition:
Aspects is a word used to describe the distance between planets. The angle they form is the aspect. You could see it as the dynamic between two planets in a chart.
Aspects between planets create either ease, and are considered gifts, or friction, which are built-in challenges to overcome.
Major aspects are the conjunction (0 degrees apart), sextile (60 degrees apart, square (90 degrees apart), trine (120 degrees apart) and opposition (180 degrees apart).
Minor aspects are the semi-sextile (30 degrees apart), the semi-square (45 degrees apart), the quincunx (150 degrees apart), and the sesquiquadrate or sesquare (135 degrees apart).
Examples:
These days, Mars is in Cancer, aspecting my natal Saturn with a square.
