<?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
	xmlns:content="http://purl.org/rss/1.0/modules/content/"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:atom="http://www.w3.org/2005/Atom"
	xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
		>
<channel>
	<title>Comments on: A Great Leap&#8230;Forward?</title>
	<atom:link href="http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/feed/" rel="self" type="application/rss+xml" />
	<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/</link>
	<description></description>
	<lastBuildDate>Sat, 20 Apr 2013 10:44:00 +0000</lastBuildDate>
	<sy:updatePeriod>hourly</sy:updatePeriod>
	<sy:updateFrequency>1</sy:updateFrequency>
	<generator>http://wordpress.org/?v=3.4.2</generator>
	<item>
		<title>By: 20 Things You Didn&#8217;t Know About&#8230; Time &#124; Phasing</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37465</link>
		<dc:creator>20 Things You Didn&#8217;t Know About&#8230; Time &#124; Phasing</dc:creator>
		<pubDate>Fri, 18 Sep 2009 08:20:51 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37465</guid>
		<description>[...] To keep this time in sync with Earth’s slowing rotation, a “leap second” must be added every few years, most recently this past New Year’s [...] </description>
		<content:encoded><![CDATA[<p>[...] To keep this time in sync with Earth’s slowing rotation, a “leap second” must be added every few years, most recently this past New Year’s [...] </p>
]]></content:encoded>
	</item>
	<item>
		<title>By: 20 Things You Didn&#8217;t Know About&#8230; Time &#171; Carpiber&#8217;s Weblog</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37464</link>
		<dc:creator>20 Things You Didn&#8217;t Know About&#8230; Time &#171; Carpiber&#8217;s Weblog</dc:creator>
		<pubDate>Thu, 17 Sep 2009 15:05:09 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37464</guid>
		<description>[...] To keep this time in sync with Earth’s slowing rotation, a “leap second” must be added every few years, most recently this past New Year’s [...] </description>
		<content:encoded><![CDATA[<p>[...] To keep this time in sync with Earth’s slowing rotation, a “leap second” must be added every few years, most recently this past New Year’s [...] </p>
]]></content:encoded>
	</item>
	<item>
		<title>By: 20 Things You Should Know About Time &#171; Aquenos&#8217;s Blog</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37463</link>
		<dc:creator>20 Things You Should Know About Time &#171; Aquenos&#8217;s Blog</dc:creator>
		<pubDate>Fri, 10 Apr 2009 09:03:26 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37463</guid>
		<description>[...] keep this time in sync with Earth’s slowing rotation, a “leap second” must be added every few years, most recently this past New Year’s [...] </description>
		<content:encoded><![CDATA[<p>[...] keep this time in sync with Earth’s slowing rotation, a “leap second” must be added every few years, most recently this past New Year’s [...] </p>
]]></content:encoded>
	</item>
	<item>
		<title>By: 20 Things You Didn't Know About... Time - GupShup Forums</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37462</link>
		<dc:creator>20 Things You Didn't Know About... Time - GupShup Forums</dc:creator>
		<pubDate>Mon, 16 Mar 2009 13:33:10 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37462</guid>
		<description>[...] years to lose about one second.  11 To keep this time in sync with Earth</description>
		<content:encoded><![CDATA[<p>[...] years to lose about one second.  11 To keep this time in sync with Earth</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: Savings Schmavings &#171; Thoughts from My Pocket</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37461</link>
		<dc:creator>Savings Schmavings &#171; Thoughts from My Pocket</dc:creator>
		<pubDate>Sun, 09 Mar 2008 15:40:19 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37461</guid>
		<description>[...] Cosmic Variance - A GIANT LEAP&#8230; FORWARD?   Posted in Uncategorized &#124; [...] </description>
		<content:encoded><![CDATA[<p>[...] Cosmic Variance &#8211; A GIANT LEAP&#8230; FORWARD?   Posted in Uncategorized | [...] </p>
]]></content:encoded>
	</item>
	<item>
		<title>By: Chris Oakley</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37429</link>
		<dc:creator>Chris Oakley</dc:creator>
		<pubDate>Mon, 03 Mar 2008 15:28:37 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37429</guid>
		<description>Oh sorry - getting confused: I meant John not Tommaso ... the cumulative difference between actual &amp; mean solar day adds up to quite a lot (+/- 15 minutes) &amp; is a correction one needs to apply to sundial readings (although I believe that it is no longer common practise to rely on these for timekeeping).</description>
		<content:encoded><![CDATA[<p>Oh sorry &#8211; getting confused: I meant John not Tommaso &#8230; the cumulative difference between actual &amp; mean solar day adds up to quite a lot (+/- 15 minutes) &amp; is a correction one needs to apply to sundial readings (although I believe that it is no longer common practise to rely on these for timekeeping).</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: Chris Oakley</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37438</link>
		<dc:creator>Chris Oakley</dc:creator>
		<pubDate>Mon, 03 Mar 2008 13:06:44 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37438</guid>
		<description>&lt;boring quibble&gt; Tommaso, you talk as though the solar day was fixed at 24 hours (apart from the odd millisecond here and there) ... actually it is the sidereal day that is pretty much fixed (at 23h 56m 4.1s)owing to conservation of angular momentum - the solar day is sometimes longer than 24h &amp; sometimes shorter as the sun does not move exactly 360/365.2422 degrees a day relative to the stellar background owing to the ellipticity of our orbit &lt;/boring quibble&gt;</description>
		<content:encoded><![CDATA[<p>&lt;boring quibble&gt; Tommaso, you talk as though the solar day was fixed at 24 hours (apart from the odd millisecond here and there) &#8230; actually it is the sidereal day that is pretty much fixed (at 23h 56m 4.1s)owing to conservation of angular momentum &#8211; the solar day is sometimes longer than 24h &amp; sometimes shorter as the sun does not move exactly 360/365.2422 degrees a day relative to the stellar background owing to the ellipticity of our orbit &lt;/boring quibble&gt;</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: February 29: On This Day In History &#124; Karol Krizka</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37437</link>
		<dc:creator>February 29: On This Day In History &#124; Karol Krizka</dc:creator>
		<pubDate>Fri, 29 Feb 2008 20:19:06 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37437</guid>
		<description>[...] it, because others have already explained it much better than I could. I suggest going over to the Cosmic Variance blog to see their explanation of leap years and leap seconds. Instead I would like to share some of the events that happened on this rare day and I found [...] </description>
		<content:encoded><![CDATA[<p>[...] it, because others have already explained it much better than I could. I suggest going over to the Cosmic Variance blog to see their explanation of leap years and leap seconds. Instead I would like to share some of the events that happened on this rare day and I found [...] </p>
]]></content:encoded>
	</item>
	<item>
		<title>By: mollishka</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37434</link>
		<dc:creator>mollishka</dc:creator>
		<pubDate>Thu, 28 Feb 2008 22:45:49 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37434</guid>
		<description>&lt;blockquote&gt;It is not ‘daylight-savings&quot; Time.
It is Daylight Saving Time.&lt;/blockquote&gt;

Yeah, but Daylight Saving&lt;b&gt;s&lt;/b&gt; Time is &lt;i&gt;sooooo&lt;/i&gt; much easier to say.</description>
		<content:encoded><![CDATA[<blockquote><p>It is not ‘daylight-savings&#8221; Time.<br />
It is Daylight Saving Time.</p></blockquote>
<p>Yeah, but Daylight Saving<b>s</b> Time is <i>sooooo</i> much easier to say.</p>
]]></content:encoded>
	</item>
	<item>
		<title>By: John Merryman</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37460</link>
		<dc:creator>John Merryman</dc:creator>
		<pubDate>Wed, 27 Feb 2008 18:03:25 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2008/02/24/a-great-leapforward/#comment-37460</guid>
		<description>Sam,

 Is there such a thing as an objective perspective, Tegemark&#039;s bird&#039;s eye view? Or is that an oxymoron? The problem with defining space as three dimensional is that these serve as coordinates for the center point. While we as individuals effectively function as points in space(and time), they are not the same point. Although much of politics and religion revolves around providing such a communal point, sects based on different points emerge, resulting in large scale conflict. You might say the Arabs and the Israelis use different frames of reference to define the same space (and time).

 I&#039;m certainly not playing down how distance regulates energy transfer. If the blast of a super nova from 1000 years ago is set to destroy us, it will do so because the energy blasted in our direction reaches us and is no longer contained in the original star. As I&#039;ve argued, there is only energy, spread across space. Time, like temperature, is a measure of the motion of this activity. This isn&#039;t presentism, because as a measure of motion it would be meaningless to specify that all this activity exists at the same instant in time. We can model time as a tensor, just as we measure temperature as a scalar, but there is no fundamental existance of this dimension, any more then there is a fundamental temperature scale. The only absolute for both would be the complete absence of motion. Time may seem fundamental from our perspective, but so is temperature. Consider the basis of Big Bang theory, redshift and cosmic background radiation, are both measures of temperature, ie. reduced levels of energy from what the scale would otherwise be. We cannot travel back in time to see what happened, we can only measure current energy levels.</description>
		<content:encoded><![CDATA[<p>Sam,</p>
<p> Is there such a thing as an objective perspective, Tegemark&#8217;s bird&#8217;s eye view? Or is that an oxymoron? The problem with defining space as three dimensional is that these serve as coordinates for the center point. While we as individuals effectively function as points in space(and time), they are not the same point. Although much of politics and religion revolves around providing such a communal point, sects based on different points emerge, resulting in large scale conflict. You might say the Arabs and the Israelis use different frames of reference to define the same space (and time).</p>
<p> I&#8217;m certainly not playing down how distance regulates energy transfer. If the blast of a super nova from 1000 years ago is set to destroy us, it will do so because the energy blasted in our direction reaches us and is no longer contained in the original star. As I&#8217;ve argued, there is only energy, spread across space. Time, like temperature, is a measure of the motion of this activity. This isn&#8217;t presentism, because as a measure of motion it would be meaningless to specify that all this activity exists at the same instant in time. We can model time as a tensor, just as we measure temperature as a scalar, but there is no fundamental existance of this dimension, any more then there is a fundamental temperature scale. The only absolute for both would be the complete absence of motion. Time may seem fundamental from our perspective, but so is temperature. Consider the basis of Big Bang theory, redshift and cosmic background radiation, are both measures of temperature, ie. reduced levels of energy from what the scale would otherwise be. We cannot travel back in time to see what happened, we can only measure current energy levels.</p>
]]></content:encoded>
	</item>
</channel>
</rss>
