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<address><a class="moz-txt-link-freetext" href="https://www.hermetic.ch/cal_stud/jdn.htm">https://www.hermetic.ch/cal_stud/jdn.htm</a></address>
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<td valign="TOP" align="LEFT"><font face="Trebuchet
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<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#intro">Introduction</a></b></li>
<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#julian_period">The
Julian Period</a></b></li>
<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#julian_day_number">Julian
Day Number</a></b></li>
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<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#astronomical">Astronomical
Julian Day Number<br>
and Astronomical Julian Date</a></b></li>
<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#chronological">Chronological
Julian Day Number<br>
and Chronological Julian Date</a></b></li>
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<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#mjd">Modified
Julian Day Number</a></b></li>
<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#ldn">Lilian
Day Number</a></b></li>
<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#different_meanings">Different
Meanings of "Julian Date"</a></b></li>
<li><b><a
href="https://www.hermetic.ch/cal_stud/jdn.htm#comp">Conversion
Algorithms</a></b></li>
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<th><font size="+2">Julian Day Numbers</font></th>
</tr>
<tr>
<td align="center">by Peter Meyer</td>
</tr>
<tr>
<td align="center"> <br>
<b>The nature and origin of<br>
the Julian Day Number system</b></td>
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<td colspan="3" class="trans">
Translations of this page in</td>
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<tr>
<td class="trans"><a
href="https://www.hermetic.ch/cal_stud/jdn_de.htm"
target="_blank">German</a></td>
<td class="trans"><a
href="http://eustudiesweb.com/numeratsiya-dniv-za-yulianskim-kalendarem/"
target="_blank">Ukrainian</a></td>
<td class="trans"><a
href="http://the-sciences.com/2017/04/08/julianski-dan-brojevi/"
target="_blank">Bosnian</a></td>
</tr>
<tr>
<td class="trans"><a
href="http://filolife.com/julian/" target="_blank">Uzbek</a></td>
<td class="trans"><a
href="https://tr-ex.me/social/?p=154"
target="_blank">Hungarian</a></td>
<td class="trans"><a
href="http://www.opensourceinitiative.net/edu/cal_stud/"
target="_blank">Russian</a></td>
</tr>
<tr>
<td class="trans"><a
href="http://xovir.com/julian-day-numbers.html"
target="_blank">Slovak #1</a></td>
<td class="trans"> </td>
<td class="trans"><a
href="https://imgvehicle.com/translated/julian"
target="_blank">Slovak #2</a></td>
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<div class="moz-cite-prefix">On 21-02-2021 17:14, R.O. wrote:<br>
</div>
<blockquote type="cite"
cite="mid:ac8cb5bb-bb2e-e090-bf2c-2e363b76f42a@gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<address><a class="moz-txt-link-freetext"
href="https://www.lanl.gov/Caesar/node202.html"
moz-do-not-send="true">https://www.lanl.gov/Caesar/node202.html</a><br>
<a class="moz-txt-link-freetext"
href="http://www.fluks.combidom.com/javascript/calendar.htm"
moz-do-not-send="true">http://www.fluks.combidom.com/javascript/calendar.htm</a>?<br>
year=2021&epoch=ad<br>
</address>
<p>Fluks: dag 1 = 1794168 en niet 1? Klopt dit?<br>
</p>
<p>Wat is CE?</p>
<p><br>
</p>
<p>Day #1 is<br>
defined March 1, AD 200 [GC and JC] - the first day both<br>
calendars are equal.</p>
<p><br>
</p>
<a name="ta:Julian" moz-do-not-send="true"></a> <a name="16053"
moz-do-not-send="true"></a>
<table cellpadding="3" border="1">
<caption><strong>Table 11.18:</strong> Chronological Julian Day
numbers for some representative dates.</caption> <tbody>
<tr valign="BASELINE">
<td align="RIGHT">Date (BC/AD)</td>
<td align="RIGHT">Date (CE)</td>
<td align="RIGHT">Julian Day</td>
<td align="RIGHT">Julian Day</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT"> </td>
<td align="RIGHT"> </td>
<td align="RIGHT">(Julian Calendar)</td>
<td align="RIGHT">(Gregorian Calendar)</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">4714 BC/11/24</td>
<td align="RIGHT">-4713 CE/11/24</td>
<td align="RIGHT">-38</td>
<td align="RIGHT">0</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">4713 BC/01/01</td>
<td align="RIGHT">-4712 CE/01/01</td>
<td align="RIGHT">0</td>
<td align="RIGHT">38</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">753 BC/04/21</td>
<td align="RIGHT">-752 CE/04/21</td>
<td align="RIGHT">1446501</td>
<td align="RIGHT">1446509</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">2 BC/10/30</td>
<td align="RIGHT">-1 CE/10/30</td>
<td align="RIGHT">1720995</td>
<td align="RIGHT">1720997</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1 BC/01/01</td>
<td align="RIGHT">0 CE/01/01</td>
<td align="RIGHT">1721058</td>
<td align="RIGHT">1721060</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1 AD/01/01</td>
<td align="RIGHT">1 CE/01/01</td>
<td align="RIGHT">1721424</td>
<td align="RIGHT">1721426</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">200 AD/02/28</td>
<td align="RIGHT">200 CE/02/28</td>
<td align="RIGHT">1794166</td>
<td align="RIGHT">1794167</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">200 AD/02/29</td>
<td align="RIGHT">200 CE/02/29</td>
<td align="RIGHT">1794167</td>
<td align="RIGHT">1794168</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">200 AD/03/01</td>
<td align="RIGHT">200 CE/03/01</td>
<td align="RIGHT">1794168</td>
<td align="RIGHT">1794168</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">300 AD/02/28</td>
<td align="RIGHT">300 CE/02/28</td>
<td align="RIGHT">1830691</td>
<td align="RIGHT">1830691</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">300 AD/02/29</td>
<td align="RIGHT">300 CE/02/29</td>
<td align="RIGHT">1830692</td>
<td align="RIGHT">1830692</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">300 AD/03/01</td>
<td align="RIGHT">300 CE/03/01</td>
<td align="RIGHT">1830693</td>
<td align="RIGHT">1830692</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1582 AD/10/04</td>
<td align="RIGHT">1582 CE/10/04</td>
<td align="RIGHT">2299160</td>
<td align="RIGHT">2299150</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1582 AD/10/14</td>
<td align="RIGHT">1582 CE/10/14</td>
<td align="RIGHT">2299170</td>
<td align="RIGHT">2299160</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1752 AD/09/02</td>
<td align="RIGHT">1752 CE/09/02</td>
<td align="RIGHT">2361221</td>
<td align="RIGHT">2361210</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1752 AD/09/13</td>
<td align="RIGHT">1752 CE/09/13</td>
<td align="RIGHT">2361232</td>
<td align="RIGHT">2361221</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1858 AD/11/16</td>
<td align="RIGHT">1858 CE/11/16</td>
<td align="RIGHT">2400012</td>
<td align="RIGHT">2400000</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1968 AD/05/23</td>
<td align="RIGHT">1968 CE/05/23</td>
<td align="RIGHT">2440013</td>
<td align="RIGHT">2440000</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">1995 AD/10/09</td>
<td align="RIGHT">1995 CE/10/09</td>
<td align="RIGHT">2450013</td>
<td align="RIGHT">2450000</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">2000 AD/01/01</td>
<td align="RIGHT">2000 CE/01/01</td>
<td align="RIGHT">2451558</td>
<td align="RIGHT">2451545</td>
</tr>
<tr valign="BASELINE">
<td align="RIGHT">2132 AD/08/31</td>
<td align="RIGHT">2132 CE/08/31</td>
<td align="RIGHT">2500014</td>
<td align="RIGHT">2500000</td>
</tr>
</tbody>
</table>
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