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- Seasonal_year abstract "The seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, or the flowering of a species of plant.The need for farmers to predict seasonal events led to the development of calendars. However, the variability from year to year of seasonal events (allegedly due to climate change or just random variation) makes the seasonal year very hard to measure. This means that calendars are based on astronomical years (which are regular enough to be easily measured) as surrogates for the seasonal year. For example, the ancient Egyptians used the heliacal rising of Sirius to predict the flooding of the Nile.A study of temperature records over the past 300 years suggests that the seasonal year is governed by the anomalistic year rather than the tropical year.This suggestion is surprising because the seasons have been thought to be governed by the tilt of the Earth's axis (see Effect of sun angle on climate). The two types of years differ by a mere 4 days over 300 years, so Thompson's result may not be significant. However, the result is not unreasonable. The seasons can be considered to be an oscillating system driven by two inputs with slightly different frequencies: the total input of energy from the sun varies with the anomalistic year, while the distribution of this energy between the hemispheres varies with the tropical year. In other physical situations, oscillating systems driven by two similar frequencies can latch onto either one. One point that must be considered is that the oscillation arising from the tilt of the axis is much greater than that arising from the distance of the sun.".
- Seasonal_year wikiPageID "596116".
- Seasonal_year wikiPageLength "2174".
- Seasonal_year wikiPageOutDegree "15".
- Seasonal_year wikiPageRevisionID "707550905".
- Seasonal_year wikiPageWikiLink Ancient_Egypt.
- Seasonal_year wikiPageWikiLink Axial_tilt.
- Seasonal_year wikiPageWikiLink Calendar.
- Seasonal_year wikiPageWikiLink Category:Units_of_time.
- Seasonal_year wikiPageWikiLink Climate_change.
- Seasonal_year wikiPageWikiLink Effect_of_Sun_angle_on_climate.
- Seasonal_year wikiPageWikiLink Heliacal_rising.
- Seasonal_year wikiPageWikiLink Nile.
- Seasonal_year wikiPageWikiLink Oscillation.
- Seasonal_year wikiPageWikiLink Season.
- Seasonal_year wikiPageWikiLink Sirius.
- Seasonal_year wikiPageWikiLink Tropical_year.
- Seasonal_year wikiPageWikiLink Year.
- Seasonal_year wikiPageWikiLinkText "Seasonal year".
- Seasonal_year wikiPageWikiLinkText "seasonal year".
- Seasonal_year wikiPageWikiLinkText "seasonal".
- Seasonal_year wikiPageWikiLinkText "year".
- Seasonal_year wikiPageUsesTemplate Template:Reflist.
- Seasonal_year subject Category:Units_of_time.
- Seasonal_year hypernym Time.
- Seasonal_year type SportsEvent.
- Seasonal_year type Unit.
- Seasonal_year comment "The seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, or the flowering of a species of plant.The need for farmers to predict seasonal events led to the development of calendars. However, the variability from year to year of seasonal events (allegedly due to climate change or just random variation) makes the seasonal year very hard to measure.".
- Seasonal_year label "Seasonal year".
- Seasonal_year sameAs Q7441921.
- Seasonal_year sameAs m.02trdj.
- Seasonal_year sameAs Q7441921.
- Seasonal_year sameAs 季節年.
- Seasonal_year wasDerivedFrom Seasonal_year?oldid=707550905.
- Seasonal_year isPrimaryTopicOf Seasonal_year.