This HTML5 document contains 19 embedded RDF statements represented using HTML+Microdata notation.

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Namespace Prefixes

Prefix	IRI
n9	http://qudt.org/vocab/quantitykind/
dcterms	http://purl.org/dc/terms/
n6	http://qudt.org/vocab/sou/
n4	http://qudt.org/schema/qudt/
n2	http://qudt.org/vocab/unit/
skos	http://www.w3.org/2004/02/skos/core#
n10	http://qudt.org/vocab/dimensionvector/
rdfs	http://www.w3.org/2000/01/rdf-schema#
n7	http://qudt.org/2.1/vocab/
rdf	http://www.w3.org/1999/02/22-rdf-syntax-ns#
xsdh	http://www.w3.org/2001/XMLSchema#

Statements

Subject Item

n2:YR_TROPICAL

rdf:type

n4:Unit

rdfs:label

Tropical Year

rdfs:isDefinedBy

n7:unit

dcterms:description

<p>A tropical year (also known as a solar year), for general purposes, is the length of time that the Sun takes to return to the same position in the cycle of seasons, as seen from Earth; for example, the time from vernal equinox to vernal equinox, or from summer solstice to summer solstice. Because of the precession of the equinoxes, the seasonal cycle does not remain exactly synchronised with the position of the Earth in its orbit around the Sun. As a consequence, the tropical year is about 20 minutes shorter than the time it takes Earth to complete one full orbit around the Sun as measured with respect to the fixed stars. Since antiquity, astronomers have progressively refined the definition of the tropical year, and currently define it as the time required for the mean Sun's tropical longitude (longitudinal position along the ecliptic relative to its position at the vernal equinox) to increase by 360 degrees (that is, to complete one full seasonal circuit).</p>

skos:altLabel

solar year

n4:exactMatch

n2:YR_TROPICAL

n4:hasDimensionVector

n10:A0E0L0I0M0H0T1D0

n4:symbol

yr{tropical}

n4:hasQuantityKind

n9:Time

n4:applicableSystem

n6:IMPERIAL n6:SI n6:USCS n6:CGS n6:CGS-EMU n6:CGS-GAUSS

n4:conversionMultiplier

3.15569e+07

n4:iec61360Code

0112/2///62720#UAB029

n4:ucumCode

a_t

n4:uneceCommonCode

D42