Japan Standard Time - Nihonhyojunji

Japanese: 日本標準時 - ニホンヒョウジュンジ
Japan Standard Time - Nihonhyojunji
The time is 9 hours added to Coordinated Universal Time (UTC). It is expressed as "+0900 (JST)". It is created by the National Institute of Information and Communications Technology (NICT) using atomic clocks and is distributed nationwide via standard radio waves, telephone lines, and Internet NTP servers. Japan time. Central Standard Time. JST (Japan standard time). →Standard time
[Additional information] Formerly, it was measured based on astronomical observations as the mean solar time on the 135th meridian east, which passes through Akashi City, Hyogo Prefecture. Currently, the National Institute of Information and Communications Technology averages and synthesizes the times obtained from multiple cesium atomic clocks and hydrogen maser atomic clocks to generate Coordinated Universal Time, which is advanced by 9 hours to determine Japan Standard Time.

Source: About Shogakukan Digital Daijisen Information | Legend

Japanese:
協定世界時(UTC)に9時間を加えた時刻。「+0900(JST)」と表す。情報通信研究機構(NICT)が原子時計によって作成し、標準電波や電話回線、インターネットのNTPサーバーを利用して全国に配信している。日本時間。中央標準時。JST(Japan standard time)。→標準時
[補説]かつては兵庫県明石市などを通過する東経135度の子午線上での平均太陽時として、天体観測に基づいて計測されていた。現在は、情報通信研究機構が複数のセシウム原子時計・水素メーザー原子時計によって得られる時刻を平均・合成して協定世界時を生成し、これを9時間進めたものを日本標準時として決定している。

出典 小学館デジタル大辞泉について 情報 | 凡例

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