Midheaven Calculator
Find the highest point of your birth chart: your MC sign and degree, the IC opposite it, and what they say about your calling and your roots.
The Midheaven, written MC from the Latin Medium Coeli (“middle of the sky”), is the point of the zodiac that was culminating on your local meridian at the moment you were born: the top of the chart, due south for most northern-hemisphere births and due north for most southern ones. Astrologers read it as your public face: the work you are drawn to, the reputation you build and the direction your life takes in the world.
Directly opposite sits the IC, the Imum Coeli or “bottom of the sky”. Where the MC looks outward, the IC looks inward, to home, family, private life and the ground you stand on. The two form an axis, so knowing one sign tells you the other. Together with the Ascendant they are the angles of the chart, the points that fix it to a real place and a real minute.
How it’s calculated
Your birthplace is looked up to find its latitude, longitude and time zone, and the zone’s history (including daylight saving time on your birth date) converts your local time into Universal Time. From there the calculator finds the apparent sidereal time at your longitude, the true angle of the sky overhead, and projects the meridian onto the ecliptic using the tilt of Earth’s axis on that date. The underlying positions are computed to within seconds of arc of NASA JPL Horizons.
The Midheaven moves quickly, through a full sign in roughly two hours and about one degree every four minutes. That is why an exact birth time matters more here than for almost anything else in astrology, and why the result shows the window of birth times that share your MC sign.
The MC and your houses
Your full reading divides the chart into Equal houses of 30° each, counted from the Ascendant. In that system the Midheaven is not automatically the start of the 10th house; it is a point in its own right, most often found in the 9th or 10th house. The calculator tells you which house yours falls in. In quadrant house systems such as Placidus, by contrast, the MC is always the 10th-house cusp.
Frequently asked
What is the Midheaven in astrology?
The Midheaven (MC) is the degree of the zodiac at the top of the sky at the moment of your birth, where the ecliptic crosses your local meridian. It is read for career, ambition, reputation and the role you take in public life. Its sign describes the style in which you tend to pursue those things.
Why is an exact birth time required?
The MC moves about one degree every four minutes and changes sign roughly every two hours. A time that is off by 30 minutes can shift it by seven or eight degrees, and near the edge of a sign even a few minutes can change the sign. The calculator shows the range of birth times that give the same MC sign so you can judge how much your recorded time matters.
What is the IC?
The IC (Imum Coeli) is the point exactly opposite the Midheaven, the lowest point of the chart. It stands for home, family, ancestry and your private inner life. Because it is always 180 degrees from the MC, its sign is always the opposite sign: a Capricorn MC always has a Cancer IC, for example.
Is the Midheaven the same as the 10th house?
It depends on the house system. In quadrant systems such as Placidus or Koch the MC is the cusp of the 10th house by definition. In Equal houses, which your full reading uses, houses are measured in 30-degree steps from the Ascendant, so the MC floats and usually lands in the 9th or 10th house. Either way its sign keeps the same meaning.
Why isn’t my Midheaven exactly 90 degrees from my Ascendant?
Because Earth’s axis is tilted, the ecliptic meets the horizon and the meridian at changing angles through the day. The distance between the Ascendant and the MC can range from well under 90 degrees to well over it, and the difference grows the farther from the equator you were born. This is ordinary geometry, not an error.
Is it free, and what happens to my data?
It is free and needs no sign-up. The birthplace you choose is sent to our server only to look up its coordinates and time zone. The chart itself, including your date and time of birth, is computed in your browser.
Your MC points the way; the chart fills in the map
Arcana Origin computes your whole chart from the same exact ephemeris, planets and Equal houses included, and reads it alongside dozens of other traditions from a single birth date.
Cast your full reading →