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<p>with perhaps the oldest such organization being the Variable Star Section of the <a href="page.php?w=British_Astronomical_Association">British Astronomical Association</a>, founded in 1890.</p>

<p><big>Detecting variability</big></p>
<p>The most common kinds of variability involve changes in brightness, but other types of variability also occur, in particular changes in the <a href="page.php?w=stellar_spectrum">spectrum</a> and <a href="page.php?w=Polarization_%28waves%29">polarization</a>. By combining <a href="page.php?w=light_curve">light curve</a> data</p><p>
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