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<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>However, I know of few who use that, since it is measured to a specific point on earth. Right AscensionA is universal (haha) MW <br /> Posted by MeteorWayne</DIV></p><p>Hour Angle + Right Ascension = Local Star Time (or Local Sidereal Time).</p><p>Hence, if you have one coordinate and could measure the other, you will get the 3rd and could go from universal equatorial coordinates to local coordinates or the other way around. </p><p>Had I been able to measure the hour angle of the "fog object" mentioned in the beginning, I could have calculated the Right Ascension, which should have lead to deep space object M31 reliably.</p>