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equatorial coordinate
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The equatorial system of coordinates.
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equatorial coordinate

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stellar positions

  • open cluster NGC 290
    In star: Basic measurements

    …in the equatorial system (the coordinates of which are called right ascension [α, or RA] and declination [δ, or DEC] and are given for some epoch—for example, 1950.0 or, currently, 2000.0). Positions of fainter stars are measured by using electronic imaging devices (e.g., a charge-coupled device, or CCD) with respect…

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