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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
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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.
90:). 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
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or just random variation) makes the seasonal year very hard to measure. This means that calendars are based on
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A study of temperature records over the past 300 years suggests that the seasonal year is governed by the
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51:(which are regular enough to be easily measured) as surrogates for the seasonal year. For example, the
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The need for farmers to predict seasonal events led to the development of
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131:"The Seasons, Global Temperature, and Precession"
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78:. This suggestion is surprising because the
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36:, or the flowering of a species of plant.
82:have been thought to be governed by the
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376:. You can help Knowledge (XXG) by
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63:to predict the flooding of the
88:Effect of sun angle on climate
34:migration of a species of bird
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129:Thomson, David (1995-04-07).
157:10.1126/science.268.5207.59
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334:bezdorizhzhia / rasputitsa
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84:tilt of the Earth's axis
372:-related article is a
149:1995Sci...268...59T
92:oscillating system
49:astronomical years
24:event such as the
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222:Temperate seasons
105:Deseasonalization
53:ancient Egyptians
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325:Mud / breakup /
275:Tropical seasons
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74:rather than the
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143:(5207): 59–68.
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18:seasonal year
378:expanding it
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342:Rainy season
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428:Seasonality
438:Time stubs
417:Categories
327:minoskamin
309:Fog season
288:Dry season
283:Wet season
116:References
110:Water year
314:Harmattan
55:used the
41:calendars
297:Specific
173:34475254
165:17755231
99:See also
26:flooding
22:seasonal
214:Seasons
145:Bibcode
136:Science
80:seasons
245:Winter
240:Autumn
235:Summer
230:Spring
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61:Sirius
32:, the
368:This
169:S2CID
86:(see
30:river
28:of a
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370:time
161:PMID
65:Nile
16:The
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