Annual variation

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Related to Annual variation: seasonal variation
(Astron.) the yearly change in the right ascension or declination of a star, produced by the combined effects of the precession of the equinoxes and the proper motion of the star.

See also: Variation

References in periodicals archive ?
Region III has a similar annual variation of erosivity as that for Region II except for a more rapid increase of the erosivity in the summer months.
Chi-squared and cluster analysis of mean annual variation show relationships among the wells that correlate with well depth and position on the flood plain.
A Kruskal-Wallis test was used to examine the annual variation within the species at Prairie Creek for all data and also for a subset consisting of only those data that were collected during the 15 May to 15 August window.
Although ecological investigations have routinely incorporated the analysis of daily, monthly, or seasonal variation in ecological parameters, annual variation has been considered less often, and published studies based on data from more than a few years are comparatively scarce.
Annual variation and survival advantage of large juvenile sideblotched lizards, Uta stansburiana: its causes and evolutionary significance.
The amplitude of the annual variation generally increases by approaching the Bermejo river estuary, which is in accordance with the increasing amount of water received from the inflowing rivers.
The annual variation rates of the NDVI were calculated using the annual mean maximum NDVI of each pixel for China and different regions during 1998-2013.
The interaction sex*bi-month was not significant ([F.sub.5/67] = 1.48; p = 0.207), the annual variation of body mass was quite similar for both sexes, with the highest values from April to September and the lowest from eecember to February (Fig.
The prices of clothes and footwear climbed up by 7% in terms of annual variation, due to the rise by 5.2% in footwear prices, 7.5% in clothes prices and 16.2% in the prices of clothing accessories.
Changes in food availability can be a result of seasonal and annual variation in weather conditions, human-induced habitat changes, and climate change (Walther et al.
Findings showed a clear annual variation in the decay rate of a radioactive isotope called chlorine 36, with the highest rate in January and February and the lowest rate in July and August, over a period from July 2005 to June 2011.
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