Asian Art Museum Daily cultural programs and exquisite art exhibits make the nearby Asian Art Museum a picture-perfect family experience. Holiday Train On exhibit starting December 7 and throughout the holiday season. Celebrate the return of a beloved annual tradition, when our holiday model train exhibit comes chugging around the bend on the second floor mezzanine. The exhibit will be here for you to enjoy by December 7 and throughout the holiday season.
More information. This program is 20 minutes in length. Baby Rhyme Time gives babies birth to 15 months and their grown-ups a chance to sing, play, and bond together. Books, rhymes, music, movement, and more for toddlers,16 months through age 2 and their caregivers.
Family Storytime Tuesdays except Dec. Books, songs, rhymes, and fun for families with children of all ages.
Cool Links. Holiday Train On exhibit starting December 7 and throughout the holiday season Celebrate the return of a beloved annual tradition, when our holiday model train exhibit comes chugging around the bend on the second floor mezzanine.
More information Baby Rhyme Time Thursdays at pm Baby Rhyme Time gives babies birth to 15 months and their grown-ups a chance to sing, play, and bond together. An hour symbol : h ;  also abbreviated hr. Such seasonal , temporal , or unequal hours varied by season and latitude. The hour was subsequently divided into 60 minutes , each of 60 seconds. Since this unit was not constant due to long term variations in the Earth's rotation, the hour was finally separated from the Earth's rotation and defined in terms of the atomic or physical second.
In the modern metric system , hours are an accepted unit of time defined as 3, atomic seconds. However, on rare occasions an hour may incorporate a positive or negative leap second , [a] making it last 3, or 3, seconds, in order to keep it within 0. Hour is a development of the Anglo-Norman houre and Middle English ure , first attested in the 13th century. The time of day is typically expressed in English in terms of hours.
Whole hours on a hour clock are expressed using the contracted phrase o'clock , from the older of clock. Hours on a hour clock "military time" are expressed as "hundred" or "hundred hours". Fifteen and thirty minutes past the hour is expressed as "a quarter past" or "after"  and "half past", respectively, from their fraction of the hour. Fifteen minutes before the hour may be expressed as "a quarter to", "of", "till", or "before" the hour. The coffin diagrams show that the Egyptians took note of the heliacal risings of 36 stars or constellations now known as " decans " , one for each of the ten-day "weeks" of their civil calendar.
Another seven stars were noted by the Egyptians during the twilight and predawn periods, [ citation needed ] although they were not important for the hour divisions. The original decans used by the Egyptians would have fallen noticeably out of their proper places over a span of several centuries. By the time of Amenhotep III c.
These were filled to the brim at sunset and the hour determined by comparing the water level against one of its twelve gauges, one for each month of the year. The later division of the day into 12 hours was accomplished by sundials marked with ten equal divisions. The morning and evening periods when the sundials failed to note time were observed as the first and last hours. The Egyptian hours were closely connected both with the priesthood of the gods and with their divine services.
By the New Kingdom , each hour was conceived as a specific region of the sky or underworld through which Ra 's solar barge travelled. Two fire-spitting cobras were said to guard the gates of each hour of the underworld, and Wadjet and the rearing cobra uraeus were also sometimes referenced as wnwt from their role protecting the dead through these gates. The Egyptian word for astronomer , used as a synonym for priest, was wnwty , "One of the Hours" or "Hour-Watcher".
The 12 shi supposedly began to be divided into 24 hours under the Tang ,  although they are first attested in the Ming -era Book of Yuan. The modern ke is now used to count quarter-hours, rather than a separate unit. As with the Egyptian night and daytime hours, the division of the day into twelve shi has been credited to the example set by the rough number of lunar cycles in a solar year,  although the year Jovian orbital cycle was more important to traditional Chinese  and Babylonian reckoning of the zodiac.
In Thailand , Laos , and Cambodia , the traditional system of noting hours is the six-hour clock. This reckons each of a day's 24 hours apart from noon as part of a fourth of the day. This system existed in the Ayutthaya Kingdom , deriving its current phrasing from the practice of publicly announcing the daytime hours with a gong and the nighttime hours with a drum.
hours (and hours) definition: infml a long time. Learn more. hour definition: 1. a period of 60 minutes: 2. the period of time when a particular activity happens or when a shop or public building is open: 3. a particular time.
The Thai system remains in informal use in the form codified in by King Chulalongkorn. The ancient Greeks and Romans originally divided the day into 12 hours and the night into 3 or 4 night watches. They were notionally deified as the Horae , although sometimes only as a triad. This structure tracked a hour day using both sundials and mechanical hour indicators. During Europe's Middle Ages , the Roman hours continued to be marked on sundials but the more important units of time were the canonical hours of the Orthodox and Catholic Church.
During daylight, these followed the pattern set by the three-hour bells of the Roman markets , which were succeeded by the bells of local churches.
Matins and lauds precede these irregularly in the morning hours; compline follows them irregularly before sleep; and the midnight office follows that. Vatican II ordered their reformation for the Catholic Church in ,  though they continue to be observed in the Orthodox churches.
bafeqysaga.gq When mechanical clocks began to be used to show hours of daylight or nighttime, their period needed to be changed every morning and evening for example, by changing the length of their pendula. The use of 24 hours for the entire day meant hours varied much less and the clocks needed to be adjusted only a few times a month. The minor irregularities of the apparent solar day were smoothed by measuring time using the mean solar day , using the Sun's movement along the celestial equator rather than along the ecliptic.
The irregularities of this time system were so minor that most clocks reckoning such hours did not need adjustment. However, scientific measurements eventually became precise enough to note the effect of tidal deceleration of the Earth by the Moon , which gradually lengthens the Earth's days.
During the French Revolution , a general decimalization of measures was enacted, including decimal time between and This hour was only briefly in official use, being repealed by the same legislation that first established the metric system. Its hours are a secondary unit computed as precisely 3, seconds. The addition of these seconds accommodates the very gradual slowing of the rotation of the Earth. In modern life, the ubiquity of clocks and other timekeeping devices means that segmentation of days according to their hours is commonplace.
Most forms of employment , whether wage or salaried labour, involves compensation based upon measured or expected hours worked. The fight for an eight-hour day was a part of labour movements around the world. Informal rush hours and happy hours cover the times of day when commuting slows down due to congestion or alcoholic drinks are available at discounted prices.
The hour record for the greatest distance travelled by a cyclist within the span of an hour is one of cycling 's greatest honours. Many different ways of counting the hours have been used. Because sunrise, sunset, and, to a lesser extent, noon, are the conspicuous points in the day, starting to count at these times was, for most people in most early societies, much easier than starting at midnight. However, with accurate clocks and modern astronomical equipment and the telegraph or similar means to transfer a time signal in a split-second , this issue is much less relevant.
Astrolabes , sundials , and astronomical clocks sometimes show the hour length and count using some of these older definitions and counting methods.
In ancient and medieval cultures, the counting of hours generally started with sunrise. Before the widespread use of artificial light, societies were more concerned with the division between night and day, and daily routines often began when light was sufficient. In fact, they divided the day into 12 parts called kaspu or "double hours" or into 60 equal parts.
Sunrise marked the beginning of the first hour, the middle of the day was at the end of the sixth hour and sunset at the end of the twelfth hour. This meant that the duration of hours varied with the season. In the Northern hemisphere, particularly in the more northerly latitudes, summer daytime hours were longer than winter daytime hours, each being one twelfth of the time between sunrise and sunset.
These variable-length hours were variously known as temporal, unequal, or seasonal hours and were in use until the appearance of the mechanical clock, which furthered the adoption of equal length hours. This is also the system used in Jewish law and frequently called "Talmudic hour" Sha'a Zemanit in a variety of texts.