The angular diameter distance d A reaches a maximum at a redshift z = z t (in the ΛCDM model, this occurs at z t ≈ ≈ 1.5 ), such that the slope of d A ( z ) changes sign at z = z t , or ∂ ∂ z d A > 0 ∀ ∀ z < z t , ∂ ∂ z d A < 0 ∀ ∀ z > z t . In reference to its appearance when plotted, z t is sometimes referred to as the turnover point. Practically, this means that if we look at objects at increasing redshift (and thus objects that are increasingly far away) those at greater redshift will span a smaller angle on the sky only until z = z t , above which the objects will begin to span greater angles on the sky at greater redshift. The turnover point seems paradoxical because it contradicts our intuition that the farther something is, the smaller it will appear.