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  2. Annual cycle - Wikipedia

    en.wikipedia.org/wiki/Annual_cycle

    In biology, the annual cycle for plants and animals details behavioral and chemical changes that take place as the seasons advance. [1] In business, a business cycle refers to the way modelling and analysis is applied to the periodic development and marketing of new products and services.

  3. Circannual cycle - Wikipedia

    en.wikipedia.org/wiki/Circannual_Cycle

    In chronobiology, the circannual cycle is characterized by biological processes and behaviors recurring on an approximate annual basis, spanning a period of about one year. This term is particularly relevant in the analysis of seasonal environmental changes and their influence on the physiology, behavior, and life cycles of organisms.

  4. Phenology - Wikipedia

    en.wikipedia.org/wiki/Phenology

    Phenology is the study of periodic events in biological life cycles and how these are influenced by seasonal and interannual variations in climate, as well as habitat factors (such as elevation).

  5. Secular variation - Wikipedia

    en.wikipedia.org/wiki/Secular_variation

    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.

  6. Photoperiodism - Wikipedia

    en.wikipedia.org/wiki/Photoperiodism

    Daylength, and thus knowledge of the season of the year, is vital to many animals. A number of biological and behavioural changes are dependent on this knowledge. Together with temperature changes, photoperiod provokes changes in the color of fur and feathers, migration, entry into hibernation, sexual behaviour, and even the resizing of organs.

  7. Season - Wikipedia

    en.wikipedia.org/wiki/Season

    prevernal, vernal, estival, serotinal, autumnal, hibernal Seasonal changes of a tree over a year. Ecologically speaking, a season is a period of the year in which only certain types of floral and animal events happen (e.g.: flowers bloom—spring; hedgehogs hibernate—winter). So, if a change in daily floral and animal events can be observed ...

  8. Why Passover's Date Changes Every Year - AOL

    www.aol.com/lifestyle/passover-know-passover...

    This year, Passover begins at sundown on April 5, and ends at sundown on April 13. Many people have Passover seders on the first and/or second nights of Passover, so seders will occur on April 5 ...

  9. Seasonality - Wikipedia

    en.wikipedia.org/wiki/Seasonality

    In time series data, seasonality refers to the trends that occur at specific regular intervals less than a year, such as weekly, monthly, or quarterly. Seasonality may be caused by various factors, such as weather, vacation, and holidays [1] and consists of periodic, repetitive, and generally regular and predictable patterns in the levels [2] of a time series.