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<h1 class="redTitleThreeCol">Our place in space</h1>
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<h2>Our place in space</h2>
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conWebDoc.5458/viewPage/1" title="Page&nbsp;1" class="current">1</a>
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title="Page&nbsp;2">2</a> <a href="http://www.nmm.ac.uk/server/show/
conWebDoc.5458/viewPage/3" title="Page&nbsp;3">3</a> <a href="http://
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<h2>Timekeeping by the Earth, Moon and Sun</h2>
<span class="cont_left_noborder"><span class="embedimg"><a
href="http://www.nmm.ac.uk/server/show/conMediaFile.3499";><img alt="A
clock" src="http://www.nmm.ac.uk/upload/img/clock_20030415133752.gif";
border="0" /></a></span></span><br />
The rotation of the Earth, the revolution of the Earth around the Sun
and the Moon around the Earth are the basis of terrestrial
timekeeping. <span class="cont_right_noborder"><span
class="embedimg"><a href="http://www.nmm.ac.uk/server/show/
conMediaFile.4327"><img alt="Illustration of the solar day"
src="http://www.nmm.ac.uk/upload/img/solar-day_20030416084401.gif";
border="0" /></a></span></span>
<p><strong><br />
<br />
The solar and sidereal day</strong></p>
<p>The <strong>solar day</strong> is measured using the passage of the
mean Sun across the sky. It lasts 24 hours - the average interval
between two successive midnights.</p>
<p class="c2"><span class="imageCaption">Looking down to the north
pole, the Earth rotates in an anticlockwise direction.<br />
Illustration by Greg Smye-Rumbsy � NMM London</span></p>
<p><br />
<br /></p>
<span class="cont_left_noborder"><span class="embedimg"><a
href="http://www.nmm.ac.uk/server/show/conMediaFile.5443";><img
alt="The sidereal day" src="http://www.nmm.ac.uk/upload/img/
siderealday2.gif" border="0" /></a></span></span><br />
The <strong>sidereal day</strong> is measured with respect to the
stars. It lasts 23 hours 56 minutes and 4 seconds. This is the time
between two successive passages of a star across the meridian - the
line connecting the due north and south points on the horizon with the
overhead point (the zenith).<br />
<br />
<span class="cont_right_noborder"><span class="embedimg"><a
href="http://www.nmm.ac.uk/server/show/conMediaFile.5445";><img
alt="The sidereal day compared to the mean solar day" src="http://
www.nmm.ac.uk/upload/img/sidereal-mean-day_20030415143827.gif"
border="0" /></a></span></span>
<p class="c3"></p>
<span class="imageCaption">The sidereal day and how it is measured
(left) and the sidereal day compared to the mean solar day (right).
Click on the images to enlarge.<br />
Illustrations by Greg Smye-Rumbsy � NMM London</span>
<p>Each <strong>solar day</strong> the Earth rotates 360� with respect
to the Sun. Similarly the Earth rotates 360� with respect to the
background stars in a <strong>sidereal day</strong>. During each solar
day, the motion of the Earth around the Sun means the Earth rotates
361� with respect to the background stars.</p>
<p><strong>Daily star positions</strong></p>
<div class="multiimage"><span class="cont_left_noborder"><span
class="embedimg"><a href="http://www.nmm.ac.uk/server/show/
conMediaFile.5173"><img alt="Star positions, Monday 22.30" src="http://
www.nmm.ac.uk/upload/img/star-pos1.jpg" border="0" /></a></span></
span> <span class="cont_right_noborder"><span class="embedimg"><a
href="http://www.nmm.ac.uk/server/show/conMediaFile.5174";><img
alt="Star positions, Tuesday 22.26" src="http://www.nmm.ac.uk/upload/
img/star-pos2.jpg" border="0" /></a></span></span> <span
class="cont_right_noborder"><span class="embedimg"><a href="http://
www.nmm.ac.uk/server/show/conMediaFile.5175"><img alt="Star positions,
Wednesday 22.22" src="http://www.nmm.ac.uk/upload/img/star-pos3.jpg";
border="0" /></a></span></span> <span class="imageCaption c4">The
difference between the solar and sidereal days means that a given star
will rise<br />
four minutes earlier each day. The diagrams illustrates how the
constellation of Orion<br />
reaches the same position four minutes earlier on each successive
day.<br />
Illustration by Greg Smye-Rumbsy � NMM London</span></div>
<br /></div>
<div class="pagination"><a href="http://www.nmm.ac.uk/server/show/
conWebDoc.5458/viewPage/1" title="Page&nbsp;1" class="current">1</a>
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title="Page&nbsp;2">2</a> <a href="http://www.nmm.ac.uk/server/show/
conWebDoc.5458/viewPage/3" title="Page&nbsp;3">3</a> <a href="http://
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<h2>GCSE Astronomy</h2>
<ul>
<li class=" parent"><a href="http://www.nmm.ac.uk/server/show/nav.
3114" class="parent">Planet Earth</a>
<ul>
<li><a href="http://www.nmm.ac.uk/server/show/nav.3115";>Introduction</
a></li>
<li class="current"><a href="http://www.nmm.ac.uk/server/show/nav.
3116" class="current">Our place in space</a></li>
<li><a href="http://www.nmm.ac.uk/server/show/nav.3117";>Shadows &amp;
sundials</a></li>
<li><a href="http://www.nmm.ac.uk/server/show/nav.3118";>Our place on
Earth</a></li>
<li><a href="http://www.nmm.ac.uk/server/show/nav.3119";>Our view of
the sky</a></li>
</ul>
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Moon</a></li>
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3130">The solar system</a></li>
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No offence to the Greenwich site but they aught to do better than have
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