Astro-Constants
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<url href="http://physics.nist.gov/cgi-bin/cuu/Value?AA" />
<categoryList>
<category>conversion</category>
<category>electromagnetic</category>
<category>nuclear</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name type="long">JANSKY</name>
<name type="short">A_Jy</name>
<alternateName />
<description>Jansky</description>
<value system="MKS">1e-26</value>
<value system="CGS">1e-23</value>
<uncertainty type="relative">0</uncertainty>
<dimensions />
<maxValue />
<minValue />
<url href="http://physics.nist.gov/cgi-bin/cuu/Value?Jy" />
<categoryList>
<category>conversion</category>
<category>cosmology</category>
<category>electromagnetic</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name type="long">AVOGADRO</name>
<name type="short">A_NA</name>
<alternateName />
<description>Avogadro's number</description>
<value>6.022140857e23</value>
<uncertainty type="relative">1.2e-8</uncertainty>
<dimensions />
<maxValue />
<minValue />
<url href="http://physics.nist.gov/cgi-bin/cuu/Value?na" />
<categoryList>
<category>conversion</category>
<category>nuclear</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name type="long">YEAR</name>
<name type="short">A_yr</name>
<alternateName>YEAR_JULIAN</alternateName>
<description>defined as exactly 365.25 days of 86400 SI seconds</description>
<value>31_557_600</value>
<uncertainty type="relative">0</uncertainty>
<dimensions />
<maxValue />
<minValue />
<url href="http://physics.nist.gov/cgi-bin/cuu/Value?yr" />
<categoryList>
<category>conversion</category>
<category>cosmology</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name type="long">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>31_556_925.1</value>
<uncertainty type="absolute">0.1</uncertainty>
<dimensions />
<maxValue>31556959</maxValue>
<minValue>31556892</minValue>
<url href="https://en.wikipedia.org/wiki/Tropical_year" />
<categoryList>
<category>conversion</category>
<category>cosmology</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name type="long">YEAR_SIDEREAL</name>
<alternateName />
<description>the period of revolution of the Earth around the Sun in a fixed reference frame</description>
<value>31_558_149.8</value>
<uncertainty type="absolute">1</uncertainty>
<dimensions />
<maxValue />
<minValue />
<url href="https://en.wikipedia.org/wiki/Sidereal_year" />
<categoryList>
<category>conversion</category>
<category>cosmology</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name type="long">YEAR_ANOMALISTIC</name>
<alternateName />
<description>the period between successive passages of the Earth through perihelion</description>
<value>31_558_432.6</value>
<uncertainty type="absolute">0.1</uncertainty>
<dimensions />
<maxValue />
<minValue />
<url href="http://asa.usno.navy.mil/SecM/Glossary.html" />
<categoryList>
<category>conversion</category>
<category>planetary</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name type="long">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>29_947_974.3</value>
<uncertainty type="absolute">0.1</uncertainty>
<dimensions />
<maxValue />
<minValue />
<url href="http://physics.nist.gov/cgi-bin/cuu/Value?yr" />
<categoryList>
<category>conversion</category>
<category>planetary</category>
</categoryList>
</PhysicalConstant>
<PhysicalConstant>
<name type="long">MASS_SOLAR</name>
<name type="short">A_msun</name>
<alternateName>SOLAR_MASS</alternateName>
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