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<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, Apr 13, 2015 at 10:45 AM, Alexander Belopolsky <span dir="ltr"><<a href="mailto:alexander.belopolsky@gmail.com" target="_blank">alexander.belopolsky@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><span class=""><br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div>Am I wrong, or is this a semantic question as to what "wall" time means?</div></blockquote></div><br></span>You are right about what wall() means, but I should have been more explicit about knowns and unknowns in the wall(loc, t) = lt equation.</div><div class="gmail_extra"><br></div><div class="gmail_extra">In that equation I considered loc (the geographical place) and lt (the time on the clock tower) to be known and t (the universal (UTC) time) to be unknown. A solution to the equation is the value of the unknown (t) given the values of the knowns (loc and lt).</div><div class="gmail_extra"><br></div><div class="gmail_extra">The rest of your exposition is correct including "a given UTC time maps to one and only one 'wall time' in a given timezone."  However, different UTC times may map to the same wall time and some expressible wall times are not results of a map of any UTC time. </div></div></blockquote><div><br></div><div>got it. I suggest you perhaps word it something like:</div><div><br></div><div>wall_time = f( location, utc_time)</div><div><br></div><div>and </div><div><br></div><div>utc_time = f( location, utc_time )</div><div><br></div><div>These are two different problems, and one is much harder than the other! (though both are ugly!)</div><div><br></div><div>you can, of course shoreten the names to "wall" and "utc" and "loc" if you like, but I kind of like long, readable names..</div><div><br></div><div>-Chris</div><div><br></div><div><br></div><div><br></div><div><br></div><div> </div></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><br>Christopher Barker, Ph.D.<br>Oceanographer<br><br>Emergency Response Division<br>NOAA/NOS/OR&R       (206) 526-6959  voice<br>7600 Sand Point Way NE   (206) 526-6329  fax<br>Seattle, WA  98115     (206) 526-6317  main reception<br><br><a href="mailto:Chris.Barker@noaa.gov" target="_blank">Chris.Barker@noaa.gov</a></div>
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