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Lopi mark this message contains true information
originally written by Lopi
(1)今年中國立春是陽曆是2月4日,可見於月曆。
(2)今年西方Spring Begins是3月19日(春分),可見於西方月曆。
(3)氣象學界訂的《氣象四季 Meteorological Seasons》以月為單位,每年平均氣溫最低的三個月為冬天(12/1/2月),所以今年3月1日是氣象學界定義的春天(3/4/5月)。參考[1]
(4)東西方都把四季界線定義於至點 Solstice 或分點 Equinox,是《天文四季》。不同的是西方把 至分點做為四季起點,東方則做為四季中點,兩者相差45天。就氣溫變化而言,東方春天定義的太早,2月4日其實還處於晚冬,西方的春天則定的太晚。以氣溫變化訂的《氣象春天》始於3月一日,比較恰當。

References

[1]Meteorological vs Astronomical Seasons
https://www.ncei.noaa.gov/news/meteorological-versus-astronomical-seasons

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