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122 lines
5.0 KiB
HTML
122 lines
5.0 KiB
HTML
<!DOCTYPE html>
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<html lang="en"><!-- #BeginTemplate "/Templates/Main.dwt" --><!-- DW6 -->
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<!-- Mirrored from www.mathsisfun.com/sun-clock.html by HTTrack Website Copier/3.x [XR&CO'2014], Sat, 29 Oct 2022 00:57:43 GMT -->
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<title>Sun Clock</title>
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<h1 class="center">Sun Clock</h1>
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<p>
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</p>
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<script src="measure/images/sol-clock-tzs.js"></script>
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<script src="measure/images/sol-clock.js"></script>
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<script>solclockMain('sun');</script>
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<h2>About the Sun Clock</h2>
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<p>See at a glance who is in Day or Night, and follow the Sunset and Sunrise around the World.</p>
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<p>Your <b>device's local time</b> is shown at the lower left corner, as well as "UTC" time (the '0' time at the center of map). <i>The</i><i> timezone bar has</i><i> no adjustment for Daylight Saving Time. </i></p>
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<p style="float:right; margin: 0 0 5px 10px;"><img src="geometry/images/planet-earth.jpg" alt="planet earth" height="162" width="162"></p>
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<h2>About the Map</h2>
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<p>The Planet Earth's shape is similar to a <a href="geometry/sphere.html">Sphere</a>, but maps are Flat.<br>
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<br>
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Curved onto Flat doesn't quite work ...</p>
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<p class="center">... try wrapping a piece of paper around a ball!</p>
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<p>So when we draw a map of the world we have to ask "how will I fit the shapes on the curved surface on to the flat surface?" This is called <b>Projection</b>, and every method of projection has its good and bad points.</p>
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<p>For the Sun Clock we used a special type of <i>Cylindrical Projection</i> called <b>Plate Carrée</b>, or <b>Equirectangular Projection</b>, because it works a bit like an x-y graph (which made the mathematics a lot easier):</p>
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<table style="border: 0; margin:auto;">
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<tbody>
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<tr>
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<td style="text-align:center;"><img src="geometry/images/cylindrical-projection.gif" alt="cylindrical projection" height="133" width="71"><br>
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<img src="images/style/right-arrow.gif" alt="right arrow" height="46" width="46"></td>
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<td><img src="geometry/images/equirectangular-projection.gif" alt="equirectangular projection" height="258" width="510"></td>
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</tr>
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</tbody></table>
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<p><i>(But it does make the land near the poles squashed-and-stretched, and countries near the equator look smaller than they should.)</i></p>
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<p>Also check out <a href="time-zones-world.html">World Time Zones</a>.</p>
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<p> </p>
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<div class="questions">
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<script>getQ(3694,3695,3696,3697);</script>
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</div>
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<div class="related">
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<a href="time-zones-world.html">World Time Zones</a>
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<a href="time.html">Time: AM/PM and 24 Hour Clock</a>
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<a href="time-add-subtract.html">Adding and Subtracting Time</a>
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<a href="time-clocks.html">Clocks - Digital and Analog</a>
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<a href="leap-years.html">Leap Years</a>
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<a href="earth-orbit.html">Earth's Orbit and Daylight</a>
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Copyright © 2020 MathsIsFun.com
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