HOUR ANGLE, the angular distance of a heavenly body from the meridian, as measured around the celestial pole. It is equal to the angle at the pole between the hour circle through the body and the meridian, but is usually expressed in time.
HOUR-GLASS, a device for measuring intervals of time, also known as sand-glass, and as log-glass when used in conjunction with the common log for ascertaining the speed of a ship. It consists of two pear-shaped bulbs of glass, united at their apices and having a minute passage formed between them. A quantity of sand (or occasionally of mercury) is enclosed in the bulbs, and the size of the passage is so proportioned that this sand will completely run through from one bulb to another in the time it is desired to measure—e.g. an hour or a minute. Instruments of this kind, which have no great pretensions to accuracy, were formerly common in churches. In the English House of Commons, as a preliminary to a division, a two-minute sand-glass is still turned, and while the sand is running the “division bells” are set in motion in every part of the building, to give members notice that a division is at hand.
HOURI, the term for a beautiful virgin who awaits the devout Mahommedan in Paradise. The word is the French representative of the Pers. hūrī, Arab, hawrā‘, a black-eyed virgin, from hawira, to be black-eyed, like a gazelle.
HOURS, CANONICAL, certain portions of the day set apart by rule (canon) of the church for prayer and devotion. The Jewish custom of praying three times a day, i.e. at the third, sixth and ninth hours, was perpetuated in the early Christian Church (Acts ii. 15, iii. 1, x. 9), and to these were added midnight (when Paul and Silas sang in prison), and the beginning of day and of night. Ambrose, Augustine and Hilary commended the example of the psalmist who gave praise “seven times a day” (Ps. cxix. 164). The seventh (Compline, Completorium) was added by Benedict. These hours were adopted especially in the monasteries as a part of the canonical life, and spread thence to the cathedral and collegiate chapters.
Since the 6th century the number and order of the hours have been fixed thus: matins, lauds, prime, terce, sext, none, vespers, compline.
Matins theoretically belongs to midnight, but in Italy it is said about 7 or 8 A.M. and in France often on the preceding evening in accordance with the statement “evening and morning were one day.” At matins is said the Venite (Ps. xcv.) and a hymn, followed by a Nocturna or night-watch (on Sundays three) which consists of twelve psalms. After the nocturna comes a lesson divided into three parts, one biblical and two patristic, and finally the Te Deum.