翻訳と辞書 Words near each other ・ Seasonal bonuses (Japan) ・ Seasonal breeder ・ Seasonal effects on suicide rates ・ Seasonal energy efficiency ratio ・ Seasonal flows on warm Martian slopes ・ Seasonal food ・ Seasonal human migration ・ Seasonal industry ・ Seasonal lag ・ Seasonal migration in Niger ・ Seasonal packaging ・ Seasonal spread trading ・ Seasonal subseries plot ・ Seasonal thermal energy storage ・ Seasonal tropical forest ・ Seasonal year ・ Seasonality ・ Seasonally adjusted annual rate ・ Seasoned equity offering ・ Seasoned Players ・ Seasoned salt ・ Seasoned tradeline ・ Seasoned Veteran ・ Seasoned Wood ・ Seasoning ・ Seasoning (colonialism) ・ Seasoning (cookware) ・ Seasoning (disambiguation) ・ Seasons (Ayumi Hamasaki song) ・ Seasons (Bing Crosby album) Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Seasonal year ： ウィキペディア英語版 Seasonal year 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 (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. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Seasonal year」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.