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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.
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 .
The weaker variations are the Earth's magnetic map. Within these weaker areas the local directions and intensities change gradually (secular variation). A compass does not point to the true North Pole but to a direction that is a function of the North Magnetic Pole and the local secular variation to yield a magnetic declination.
An additive model would be used when the variations around the trend do not vary with the level of the time series whereas a multiplicative model would be appropriate if the trend is proportional to the level of the time series. [3] Sometimes the trend and cyclical components are grouped into one, called the trend-cycle component.
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 ...
A rather different art developed out of northern realist traditions in 17th century Dutch Golden Age painting, which had very little religious art, and little history painting, instead playing a crucial part in developing secular genres such as still life, genre paintings of everyday scenes, and landscape painting.
Gothic art was a style of medieval art that developed in Northern France out of Romanesque art in the 12th century, led by the concurrent development of Gothic architecture. It spread to all of Western Europe , and much of Northern , Southern and Central Europe , never quite effacing more classical styles in Italy.
As a secular, non-sectarian, universal notion of art arose in 19th-century Western Europe, secular artists occasionally treated Christian themes (Bouguereau, Manet). Only rarely was a Christian artist included in the historical canon (such as Rouault or Stanley Spencer ).