<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><br><div class="gmail_quote"><div dir="ltr">On Sun, Dec 2, 2018 at 8:29 PM Brent Allsop <<a href="mailto:brent.allsop@gmail.com">brent.allsop@gmail.com</a>> wrote:<br></div><div dir="ltr"><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi John,<br><div>Very cool and interesting.</div><div>But since it seems to me, the only way to judge the accuracy of something like a clock, is to have something to compare it to, I always wonder: how can we objectively know it is so accurate?</div></div></blockquote><div> </div><div class="gmail_default" style=""><font face="arial, helvetica, sans-serif"></font><font size="4">There is no one true objective time but you can test a clock against something you already trust. If you trust Newton and he says the Earth's rotation should be slowing down due to the moon you can see if the clock can measure that, and if you trust Einstein who says the orbital speed of 2 Neutron Stars should speed up because their orbit will decay due to Gravitational Waves you can see if the clock can measure that. And if you make a new clock you can test it against an old trusted clock and see which one agrees more with Newton and Einstein.<br><br>John K Clark</font><br></div><br>
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