A tide dial, also known as a Massor scratch dial, is a sundial marked with the canonical hours rather than or in addition to the standard hours of daylight. Such sundials were particularly common between the 7th and 14th centuries in Europe, at which point they began to be replaced by mechanical clocks. There are more than 3,000 surviving tide dials in England and at least 1,500 in France.
The name tide dial preserves the Old English term tīd , used for hours and canonical hours prior to the Norman Conquest of England, after which the Norman French hour gradually replaced it. The actual Old English name for sundials was dægmæl or "day-marker".
Jews long recited prayers at fixed times of day. Psalm 119 in particular mentions praising God seven times a day, Benedict upon their religious communities.and the apostles Peter and John are mentioned attending afternoon prayers. Christian communities initially followed numerous local traditions with regard to prayer, but Charlemagne compelled his subjects to follow the Roman liturgy and his son Louis the Pious imposed the Rule of St
The canonical hours adopted by Benedict and imposed by the Frankish kings were the office of matins in the wee hours of the night,Lauds at dawn, Prime at the 1st hour of sunlight, Terce at the 3rd, Sext at the 6th, Nones at the 9th, Vespers at sunset, and Compline before retiring in complete silence. Monks were called to these hours by their abbot or by the ringing of the church bell, with the time between services organized in reading the Bible or other religious texts, in manual labor, or in sleep.
The need for these monastic communities and others to organize their times of prayer prompted the establishment of tide dials built into the walls of churches. They began to be used in England in the late 7th century and spread from there across continental Europe through copies of Bede's works and by the Saxon and Hiberno-Scottish missions. Within England, tide dials fell out of favor after the Norman Conquest.By the 13th century, some tide dials—like that at Strasbourg Cathedral—were constructed as independent statues rather than built into the walls of the churches. From the 14th century onwards, the cathedrals and other large churches began to use mechanical clocks and the canonical sundials lost their utility, except in small rural churches, where they remained in use until the 16th century.
There are more than 3,000 surviving tide dials in Englandand at least 1,500 in France, mainly in Normandy, Touraine, Charente, and at monasteries along the pilgrimage routes to Santiago de Compostella in northwestern Spain.
With Christendom confined to the Northern Hemisphere, the tide dials were often carved vertically onto the south side of the church chancel at eye level near the priest's door. In an abbey or large monastery, dials were carefully carved into the stone walls, while in rural churches they were very often just scratched onto the wall.
Some tide dials have a stone gnomon, but many have a circular hole which is used to hold a more easily replaced or adjusted wooden gnomon. These gnomons were perpendicular to the wall and cast a shadow upon the dial, a semicircle divided into a number of equal sectors. Most dials have supplementary lines marking the other 8 daytime hours, but are characterized by their noting the canonical hours particularly. The lines for the canonical hours may be longer or marked with a dot or cross. The divisions are seldom numbered.
Dials often have holes along the circumference of their semicircle. As additional gnomons were needless and these holes are often quite shallow, Cole suggests they were used to quickly and easily reconstruct the tide dials following a fresh whitewash of the church walls with chalk or lime.
The oldest surviving English tide dial is on the 7th- or 8th-century Bewcastle Cross in the church graveyard of St Cuthbert's in Bewcastle, Cumbria. It is carved on the south face of a Celtic cross at some height from the ground and is divided by five principal lines into four tides. Two of these lines, those for 9 am and noon, are crossed at the point. The four spaces are further subdivided so as to give the twelve daylight hours of the Romans. On one side of the dial, there is a vertical line which touches the semicircular border at the second afternoon hour. This may be an accident, but the same kind of line is found on the dial in the crypt of Bamburgh Church, where it marks a later hour of the day. The sundial may have been used for calculating the date of the spring equinox and hence Easter.
Nendrum Monastery in Northern Ireland, supposedly founded in the 5th century by St Machaoi, now has a reconstructed tide dial.The 9th-century tide dial gives the name of its sculptor and a priest.
The 1056 x 1065 tide dial at St Gregory's Minster in Kirkdale, North Yorkshire, has four principal divisions marked by five crossed lines, subdivided by single lines. One marking ¼ of the way between sunrise and noon is an incised cross that would indicate about 9 am at midwinter and 6 am at midsummer. It was dedicated to a "Hawarth".
Proper tide dials prominently displaying the canonical hours:
Other ecclesiastical sundials ("Mass dials") used to determine times for prayer and Mass during the same period:
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Benedict of Nursia is a Christian saint venerated in the Catholic Church, the Eastern Orthodox Church, the Oriental Orthodox Churches, the Anglican Communion and Old Catholic Churches. He is a patron saint of Europe.
A sundial is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate and a gnomon, which casts a shadow onto the dial. As the Sun appears to move across the sky, the shadow aligns with different hour-lines, which are marked on the dial to indicate the time of day. The style is the time-telling edge of the gnomon, though a single point or nodus may be used. The gnomon casts a broad shadow; the shadow of the style shows the time. The gnomon may be a rod, wire, or elaborately decorated metal casting. The style must be parallel to the axis of the Earth's rotation for the sundial to be accurate throughout the year. The style's angle from horizontal is equal to the sundial's geographical latitude.
A diptych is any object with two flat plates which are a pair, these are often attached at a hinge. For example, the standard notebook and school exercise book of the ancient world was a diptych consisting of a pair of such plates that contained a recessed space filled with wax. Writing was accomplished by scratching the wax surface with a stylus. When the notes were no longer needed, the wax could be slightly heated and then smoothed to allow reuse. Ordinary versions had wooden frames, but more luxurious diptychs were crafted with more expensive materials.
In the practice of Christianity, canonical hours mark the divisions of the day in terms of fixed times of prayer at regular intervals. A book of hours, chiefly a breviary, normally contains a version of, or selection from, such prayers.
Matins, or Mattins, is a canonical hour of Christian liturgy.
The Bewcastle Cross is an Anglo-Saxon cross which is still in its original position within the churchyard of St Cuthbert's church at Bewcastle, in the English county of Cumbria. The cross, which probably dates from the 7th or early 8th century, features reliefs and inscriptions in the runic alphabet. The head of the cross is missing but the remains are 14.5 feet high, and almost square in section 22 x 21 1/4 inches at the base. The crosses of Bewcastle and Ruthwell have been described by the scholar Nikolaus Pevsner as "the greatest achievement of their date in the whole of Europe".
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Nendrum Monastery was a Christian monastery on Mahee Island in Strangford Lough, County Down, Northern Ireland. Medieval records say it was founded in the 5th century, but this is uncertain. The monastery came to an end at some time between 974 and 1178, but its church served a parish until the site was abandoned in the 15th century. Some remains of the monastery can still be seen.
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