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<p>is determined retrospectively.  In particular, time synchronization has been accomplished by using pairs of <a href="page.php?w=radio_telescope">radio telescope</a>s to listen to a <a href="page.php?w=pulsar">pulsar</a>, with the time transfer accomplished by comparing time offsets of the received pulsar signal.</p>

<p><big>Examples</big></p>
<p>Examples of time and frequency transfer techniques include:</p>

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*Simultaneous observation methods:<br/>
** Simultaneous <a href="page.php?w=carrier_signal">carrier</a> <a href="page.php?w=phase_%28waves%29">phase</a></p><p>
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