Midheaven (MC) in Astrology: Meaning, Natal, How to Find Web22. Apr. 2022 · MC Sign Meaning. In general, the MC is a very important part of the chart—because it helps us identify who people are on the outside vs. what they are like on the inside. In fact, the four corners of the chart work together to show these things. For example, the Midheaven speaks on our public face, whereas the IC speaks on our past …