This is the reason why modern [[முதனெடுங்கோடு]] passes more than 100 m to the east of the [[Prime meridian (Greenwich)|historical astronomic prime meridian]] in Greenwich.<ref>{{cite journal| title = Why the Greenwich meridian moved | first1 = Stephen | last1 = Malys | first2 = John H. | last2 = Seago | first3 = Nikolaos K. | last3 = Palvis | first4 = P. Kenneth | last4 = Seidelmann | first5 = George H. | last5 = Kaplan | journal = Journal of Geodesy | volume = 89 | issue = 12 | pages = 1263 | date = 1 ஆகத்து 2015 | doi = 10.1007/s00190-015-0844-y|bibcode = 2015JGeod..89.1263M | doi-access = free }}</ref>
==ஒப்பீட்டு மதிப்புகள்==
==Comparative values worldwide==
Toolsபல்வேறு existஇடங்களில் forஈர்ப்புவிசை calculatingமதிப்புகளை theகணக்கிட strengthபல்வேறு of gravity at various cities around theகருவிகள் worldஉள்ளன.<ref name=wolfram>[http://www.wolframalpha.com/widgets/view.jsp?id=d34e8683df527e3555153d979bcda9cf Gravitational Fields Widget as of Oct 25th, 2012] – [[வொல்பிராம் அல்பா]]</ref> Theஉயர் effectநிலநேர்க்கோடு ofநகரங்களில் latitudeஈர்ப்பு canவிசையின் beதாக்கத்தினை clearlyதெளிவாகக் seen with gravity in high-latitude citiesகாணலாம்: Anchorage[[ஏங்கரெஜ்]] (9.826 m/s<sup>2</sup>), Helsinki[[எல்சிங்கி]] (9.825 m/s<sup>2</sup>), being about 0.5%greaterஇவற்றுடன் than that in cities near the equatorஒப்பிடுக: Kuala Lumpur[[கோலாலம்பூர்]] (9.776 m/s<sup>2</sup>), Manila[[மணிலா]] (9.780 m/s<sup>2</sup>).<!-- (| V1 - V2 | / ((V1 + V2)/2)) * 100 = 0.52038% --> The effect of altitude can be seen in Mexico City (9.776 m/s<sup>2</sup>; altitude {{convert|2240|m|ft|}}), and by comparing Denver (9.798 m/s<sup>2</sup>; {{convert|1616|m|ft}}) with Washington, D.C. (9.801 m/s<sup>2</sup>; {{convert|30|m|ft}}), both of which are near 39° N. Measured values can be obtained from Physical and Mathematical Tables by T.M. Yarwood and F. Castle, Macmillan, revised edition 1970.<ref>T.M. Yarwood and F. Castle, ''Physical and Mathematical Tables'', revised edition, Macmillan and Co LTD, London and Basingstoke, Printed in Great Britain by The University Press, Glasgow, 1970, pp 22 & 23.</ref>
