ra
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(1) ウラン鉱石中に微量に存在する、放射性の強い金属元素(an intensely radioactive metallic element that occurs in minute amounts in uranium ores)
(2) タカの頭部を持つ古代エジプトの太陽神全宇宙の創造者彼は、アメンラーが神の王となるよう神アーメンと同化した(ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods)(ancient Egyptian sun god with the head of a hawk)(a universal creator)(he merged with the god Amen as Amen-Ra to become the king of the gods)
(3) 春分点から空の物体を通り抜ける時圏の交点までに東向きに天の赤道に沿って測定された角度を指定する赤道の座標通常、時間と分と秒で表される天球上の位置を特定するために偏角を用いる((astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees")(the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky)(usually expressed in hours and minutes and seconds)(used with declination to specify positions on the celestial sphere)
⇒赤経の1時間が15度に等しい(used with declination to specify positions on the celestial sphere)
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