English Dictionary

astronomical unit

名詞

(astronomy) 149,597,870,700 metres, the approximate mean distance from the Earth to the Sun (the semi-major axis of Earth's orbit), (symbol AU), used to measure distances in the solar system.

日本語の意味

天文単位：太陽系内の距離を測るための単位で、地球から太陽までの平均距離（約149,597,870,700メートル）を示す

The comet passed within 0.2 astronomical unit of Earth, prompting close observation by astronomers.

その彗星は地球に約0.2天文単位（天文単位＝約149,597,870,700メートル、地球と太陽の平均距離）まで接近し、天文学者たちによる綿密な観測を促しました。

意味（1）

(astronomy) 149,597,870,700 metres, the approximate mean distance from the Earth to the Sun (the semi-major axis of Earth's orbit), (symbol AU), used to measure distances in the solar system.

Now this big quarter of a Jupiter mass planet is in an orbit about Zeta 2 Reticuli which lasts 18.9 days and has a Semi-Major Axis of 0.14 Astronomical Unit (AU). For comparison Mercury has a Semi-Major Axis of 0.387 AU equal to 36 million miles and Earth has a Semi-Major Axis of 1.00 AU equal to 92.9 million miles. Now if we assume that this newly discovered planet, which we will name Reticulum 1 in accordance with Bob Lazar’s convention, is the closest one to Zeta 2 Reticuli (it’s hard to imagine a closer one), then following Bode’s Law (the law which states each planet is about twice the distance from it’s sun as its inner neighbor) Reticulum 2 should be at 0.28 AU, Reticulum 3 should be at 0.56 AU and, INTERESTINGLY, Reticulum 4 would be at 1.12 AU in between the Earth’s 1.00 AU and Mars’s 1.52 AU, well within the “life-zone” of a G class star!

astronomical units （ plural ）