DaytimeDaytime as observed on Earth is the period of the day during which a given location experiences natural illumination from direct sunlight. Daytime occurs when the Sun appears above the local horizon, that is, anywhere on the globe's hemisphere facing the Sun. In direct sunlight the movement of the sun can be recorded and observed using a sundial that casts a shadow that slowly moves during the day. Other planets and natural satellites that rotate relative to a luminous primary body, such as a local star, also experience daytime, but this article primarily discusses daytime on Earth.
Unit diskIn mathematics, the open unit disk (or disc) around P (where P is a given point in the plane), is the set of points whose distance from P is less than 1: The closed unit disk around P is the set of points whose distance from P is less than or equal to one: Unit disks are special cases of disks and unit balls; as such, they contain the interior of the unit circle and, in the case of the closed unit disk, the unit circle itself. Without further specifications, the term unit disk is used for the open unit disk about the origin, , with respect to the standard Euclidean metric.
Modified gross national incomeModified gross national income, Modified GNI or GNI* was created by the Central Bank of Ireland in February 2017 as a new way to measure the Irish economy, and Irish indebtedness, due to the increasing distortion that the base erosion and profit shifting ("BEPS") tools of US multinational tax schemes were having on Irish GNP and Irish GDP; the climax being the July 2016 leprechaun economics affair with Apple Inc. While "Inflated GDP-per-capita" due to BEPS tools is a feature of tax havens, Ireland was the first to adjust its GDP metrics.
