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The redshift-magnitude relation (or magnitude-redshift relation) is a function of redshift (or distance) that affectively yields the distance modulus associated with that redshift: the difference between apparent magnitude and absolute magnitude. This was of great interest when the expansion of the universe was first proposed. It is also of current interest: like the redshift-angular size relation, it is straightforward given some simplifying approximations: i.e., constant. However, at cosmological distances, various models as well as observation reveal it is not so simple, and observation (with use of the cosmic distance ladder) can be used to select and tweak models.