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The secular variation of a time series is its long-term, non-periodic variation (see Decomposition of time series).Whether a variation is perceived as secular or not depends on the available timescale: a variation that is secular over a timescale of centuries may be a segment of what is, over a timescale of millions of years, a periodic variation.
Examples of purely domestic architecture include the great hall of a fortified manor in England, and a small number of large town houses in France and Germany and several palazzos in Venice. A great many more small houses are spread across Europe, often greatly altered by the insertion of later windows, and sometimes with their antiquity ...
Although secular and civic architecture in general was subordinate in importance to ecclesiastical architecture, civic architecture grew in importance as the Middle Ages progressed. David Watkin , for example writes about secular Gothic architecture in present-day Belgium : "However, it is the secular architecture, the guild-halls and town ...
The first secular examples appeared in the 12th century following the establishment of the knightly class. [32] These tombs were usually placed on flat marble slabs supported by tomb-style chests (also known as tumba) [10] decorated with heraldry and architectural detailing. The earliest examples showing armour date from the 1240s, with the ...
Geomagnetic secular variation refers to changes in the Earth's magnetic field on time scales of about a year or more. These changes mostly reflect changes in the Earth's interior , while more rapid changes mostly originate in the ionosphere or magnetosphere .
Port with the disembarkation of Cleopatra in Tarsus (1642), by Claude Lorrain, Musée du Louvre, Paris. Light in painting fulfills several objectives like, both plastic and aesthetic: on the one hand, it is a fundamental factor in the technical representation of the work, since its presence determines the vision of the projected image, as it affects certain values such as color, texture and ...
Most Insular art originates from the Irish monastic movement of Celtic Christianity, or metalwork for the secular elite, and the period begins around 600 with the combining of Celtic and Anglo-Saxon styles. One major distinctive feature is interlace decoration, in particular the interlace decoration as found at Sutton Hoo, in East Anglia.
For example, time series are usually decomposed into: , the trend component at time t, which reflects the long-term progression of the series (secular variation). A trend exists when there is a persistent increasing or decreasing direction in the data. The trend component does not have to be linear. [1]