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      <maxValue/>
      <minValue/>
      <source url="https://en.wikipedia.org/wiki/Angstrom"/>
      <categoryList>
        <category>conversion</category>
        <category>electromagnetic</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>JANSKY</name>
      <alternateName/>
      <symbol>Jy</symbol>
      <description>Jansky, a unit of flux density</description>
      <value>1e-26</value>
      <uncertainty type="relative">0</uncertainty>
      <dimensions mass="1" time="-2"/>
      <maxValue/>
      <minValue/>
      <source url="https://en.wikipedia.org/wiki/Jansky" authority="IAU"/>
      <categoryList>
        <category>conversion</category>
        <category>cosmology</category>
        <category>electromagnetic</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>AVOGADRO</name>
      <alternateName/>
      <description>Avogadro's number</description>
      <value>6.02214076e23</value>
      <uncertainty type="relative">0</uncertainty>
      <dimensions amountOfSubstance="-1"/>
      <maxValue/>
      <minValue/>
      <source url="http://physics.nist.gov/cgi-bin/cuu/Value?na" authority="2018 CODATA" year="2019"/>
      <categoryList>
        <category>conversion</category>
        <category>nuclear</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>YEAR</name>
      <alternateName>YEAR_JULIAN</alternateName>
      <description>defined as exactly 365.25 days of 86400 SI seconds</description>
      <value>31557600</value>
      <!-- <value>31_557_600</value> -->
      <uncertainty type="relative">0</uncertainty>
      <dimensions time="1"/>
      <maxValue/>
      <minValue/>
      <source url="https://en.wikipedia.org/wiki/Julian_year_(astronomy)"/>
      <categoryList>
        <category>conversion</category>
        <category>cosmology</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>YEAR_TROPICAL</name>
      <alternateName/>
      <description>the period of time for the ecliptic longitude of the Sun to increase 360 degrees, approximated by the Gregorian calendar</description>
      <value>31556925.1</value>
      <!-- <value>31_556_925.1</value> -->
      <uncertainty type="absolute">0.1</uncertainty>
      <dimensions time="1"/>
      <maxValue>31556959</maxValue>
      <minValue>31556892</minValue>
      <source url="https://en.wikipedia.org/wiki/Tropical_year"/>
      <categoryList>
        <category>conversion</category>
        <category>cosmology</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>YEAR_SIDEREAL</name>
      <alternateName/>
      <description>the period of revolution of the Earth around the Sun in a fixed reference frame</description>
      <value>31558149.8</value>
      <!-- <value>31_558_149.8</value> -->
      <uncertainty type="absolute">1</uncertainty>
      <dimensions time="1"/>
      <maxValue/>
      <minValue/>
      <source url="https://en.wikipedia.org/wiki/Sidereal_year"/>
      <categoryList>
        <category>conversion</category>
        <category>cosmology</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>YEAR_ANOMALISTIC</name>
      <alternateName/>
      <description>the period between successive passages of the Earth through perihelion</description>
      <value>31558432.6</value>
      <!-- <value>31_558_432.6</value> -->
      <uncertainty type="absolute">0.1</uncertainty>
      <dimensions time="1"/>
      <maxValue/>
      <minValue/>
      <source url="https://en.wikipedia.org/wiki/Year#Sidereal,_tropical,_and_anomalistic_years"/>
      <categoryList>
        <category>conversion</category>
        <category>planetary</category>
      </categoryList>
    </PhysicalConstant>
    <PhysicalConstant>
      <name>YEAR_ECLIPSE</name>
      <alternateName/>
      <description>the period between successive passages of the Sun (as seen from the geocenter) through the same lunar node</description>
      <value>29947974.3</value>
      <!-- <value>29_947_974.3</value> -->
      <uncertainty type="absolute">0.1</uncertainty>
      <dimensions time="1"/>
      <maxValue/>
      <minValue/>
      <source url="https://en.wikipedia.org/wiki/Year#Draconic_year"/>
      <categoryList>
        <category>conversion</category>
        <category>planetary</category>
      </categoryList>
    </PhysicalConstant>