Two instances of this quantity are cubed and divided by each other to yield a constant of proportionality of 3.98 in the derivation of Seeliger's density theorem.
Two instances of this quantity are cubed and divided by each other to yield a constant of proportionality of 3.98 in the derivation of Seeliger's density theorem. One form of this quantity is defined as the actual size of the object divided by its angular size and appears in a duality relation called Etherington's reciprocity theorem. The logarithm of ratios of this quantity is multiplied by five in the superposition of main sequences method for deriving this quantity. The tangent of the angle of the line of sight is multiplied by an object's radial velocity and divided by the proper motion in a formula for this quantity called the moving cluster method. Wilson and Bappu's observation that a Calcium 2 emission line is correlated with a star's luminosity is often used as the basis for a method of determining this quantity's namesake modulus, which is the difference between a star's apparent magnitude and absolute magnitude. Standard candles are used to calibrate scales that measure, for 10 points, what quantity, whose magnitudes are often visualized using the namesake "cosmic ladder?"
Two instances of this quantity are cubed and divided by each other to yield a constant of proportionality of 3.98 in the derivation of Seeliger's density theorem.
distance