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Mathematically, the climatological annual cycle is commonly estimated from observational data or model output by taking the average of all
Januaries, all Februaries, and so forth. If the observational record is long enough and conditions are stationary (i.e. there is no significant long-term trend),
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refers to the way modelling and analysis is applied to the periodic development and marketing of new products and services.
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refers to a set of changes or events that uniformly, or consistently, take place at the same time of year.
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McNamara, John M. and
Houston, Alasdair I. (2008) "Introduction: Adaptation to the annual cycle"
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over the course of the year. Such quantities might be influenced directly (e.g. incoming
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which tracks the various saint's days. Some
Christian churches only observe the
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Philosophical
Transactions of the Royal Society of London B Biological Sciences
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over the winter and summer hemispheres, respectively) by orbital position.
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a meaningful annual cycle will result that can be used to calculate an
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