Calculate the Midheaven (MC)
The Midheaven is the ecliptic degree that is culminating (crossing the meridian) at the given moment. It's the cusp of the 10th house.
Formula from Meeus: tan(MC) = tan(LST) / cos(ε)
Local Sidereal Time in degrees (0-360)
Obliquity of the ecliptic in degrees (~23.4°)
Midheaven position in ecliptic longitude (0-360°)
"Astronomical Algorithms" by Jean Meeus, Chapter 13
// LST = 180° (sidereal noon), obliquity = 23.44°const mc = calculateMidheaven(180, 23.44);console.log(mc); // ~180° (0° Libra) Copy
// LST = 180° (sidereal noon), obliquity = 23.44°const mc = calculateMidheaven(180, 23.44);console.log(mc); // ~180° (0° Libra)
Calculate the Midheaven (MC)
The Midheaven is the ecliptic degree that is culminating (crossing the meridian) at the given moment. It's the cusp of the 10th house.
Formula from Meeus: tan(MC) = tan(LST) / cos(ε)