Besselian year

Japanese: ベッセル年 - ベッセルねん(英語表記)Besselian year
Besselian year
Taking into account the effect of aberration, the beginning of the solar year is the moment when the mean right ascension of the sun reaches 18:40 or 280°, and since it is the same regardless of the location of the longitude, it is used to calculate the positions of celestial bodies. In modern times, the beginning of the Bessel year coincides well with the actual New Year's Day, and the time is expressed in decimal units of years.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
光行差の影響を考えにいれて,平均太陽の赤経が 18時 40分あるいは 280°になる瞬間を年始とした太陽年で,経度の異なる土地でも同じになるので,天体の位置計算などに用いられる。ベッセル年の年頭は,近代においては実際の元旦とよく一致し,時刻の表示は小数を用いた年単位で表わされる。

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