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Ìlà 60:
== Àkíyèsí ==
<ref name=epoch>All astronomical quantities vary, both [[Secular phenomena|secularly]] and [[Frequency|periodically]]. The quantities given are the values at the instant [[J2000.0]] of the secular variation, ignoring all periodic variations.</ref> <ref name=asc_node>The reference lists the longitude of the ascending node as -11.26064°, which is equivalent to 348.73936° by the fact that any angle is equal to itself plus 360°.</ref> <ref name=arg_peri>The reference lists the [[longitude of periapsis|longitude of perihelion]], which is the sum of the longitude of the ascending node and the argument of perihelion. That is, 114.20783° + (-11.26064°) = 102.94719°.</ref><ref name="blue planet">"Blue Planet" is used as the title of two films (''[[Blue Planet (film)|Blue Planet]]'' and ''[[The Blue Planet]]''), in the ''[[Life (magazine)|Life]]'' issue "The Incredible Year '68", which featured the [[Earthrise]] photo with [http://yalepress.yale.edu/yupbooks/excerpts/poole_earthrise.pdf lines] from poet [[James Dickey]] ("Behold/The blue planet steeped in its dream/Of reality"), and in the title of the [[European Space Agency]] bulletin report ''[http://www.esa.int/esapub/bulletin/bulletin137/bul137b_drinkwater.pdf Exploring the water cycle of the 'Blue Planet']''.</ref><ref name="Terra">By [[International Astronomical Union]] convention, the term ''terra'' is used only for naming extensive land masses on celestial bodies other than the Earth. ''Cf.'' {{cite web | last=Blue | first=Jennifer | date=2007-07-05 | url=http://planetarynames.wr.usgs.gov/jsp/append5.jsp | title=Descriptor Terms (Feature Types) | work=Gazetteer of Planetary Nomenclature | publisher=USGS | accessdate=2007-07-05 }}</ref><ref name=sidereal_solar>The number of solar days is one less than the number of [[sidereal day]]s because the orbital motion of the Earth about the Sun results in one additional revolution of the planet about its axis.</ref><ref name="water vapor">At present, the other planets in the Solar System are either too hot or too cold to support liquid water on the surface in vapor-liquid equilibrium. As of 2007, water vapor has been detected in the atmosphere of only one extrasolar planet, and it is a gas giant. See: {{cite journal | last=Tinetti | first=G. | coauthors=Vidal-Madjar, A.; Liang, M.C.; Beaulieu, J. P.; Yung, Y.; Carey, S.; Barber, R. J.; Tennyson, J.; Ribas, I | title=Water vapour in the atmosphere of a transiting extrasolar planet | journal=Nature | month=July | year=2007 | volume=448 | pages=169–171 | url=http://www.nature.com/nature/journal/v448/n7150/abs/nature06002.html | doi = 10.1038/nature06002 | pmid=17625559 | issue=7150 }}
</ref><ref name=surfacecover>Due to natural fluctuations, ambiguities surrounding [[Ice shelf|ice shelves]], and mapping conventions for [[vertical datum]]s, exact values for land and ocean coverage are not meaningful. Based on data from the [[Vector Map]] and [http://www-gem.jrc.it/ Global Landcover] datasets, extreme values for coverage of lakes and streams are 0.6% and 1.0% of the earth's surface. The ice shields of [[Antarctica]] and [[Greenland]] are counted as land, even though much of the rock which supports them lies below sea level.</ref>▼
▲<ref name=surfacecover>Due to natural fluctuations, ambiguities surrounding [[Ice shelf|ice shelves]], and mapping conventions for [[vertical datum]]s, exact values for land and ocean coverage are not meaningful. Based on data from the [[Vector Map]] and [http://www-gem.jrc.it/ Global Landcover] datasets, extreme values for coverage of lakes and streams are 0.6% and 1.0% of the earth's surface. The ice shields of [[Antarctica]] and [[Greenland]] are counted as land, even though much of the rock which supports them lies below sea level.</ref>
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