Glossary
Midheaven (MC)
The Midheaven (Medium Coeli) is where the ecliptic crosses the local meridian — the highest point a planet reaches in the sky. A planet's MC line marks where it was exactly culminating at your birth.
Near an MC line, the planet tends to express publicly: work, reputation, the role a place hands you. MC and IC lines depend on the meridian rather than the horizon, which makes them the most reliable lines when a birth time is approximate.