Editing Very-long-baseline interferometry (section)

==International VLBI Service for Geodesy and Astrometry{{anchor|IVS}}==
The '''International VLBI Service for Geodesy and Astrometry''' ('''IVS''') is an international collaboration whose purpose is to use the observation of astronomical radio sources using VLBI to precisely determine [[earth orientation parameters]] (EOP) and celestial reference frames (CRF) and terrestrial reference frames (TRF).<ref name="Nothnagel2016">{{cite journal |last1=Nothnagel |first1=A. |last2=Artz |first2=T. |last3=Behrend |first3=D. |last4=Malkin |first4=Z. |title=International VLBI Service for Geodesy and Astrometry |journal=Journal of Geodesy |date=8 September 2016 |volume=91 |issue=7 |pages=711–721 |doi=10.1007/s00190-016-0950-5 |bibcode=2017JGeod..91..711N |s2cid=123256580 }}</ref> IVS is a service operating under the [[International Astronomical Union]] (IAU) and the [[International Association of Geodesy]] (IAG).<ref name="Schuh2012">{{cite journal |last1=Schuh |first1=H. |last2=Behrend |first2=D. |title=VLBI: A fascinating technique for geodesy and astrometry |journal=Journal of Geodynamics |date=October 2012 |volume=61 |pages=68–80 |doi=10.1016/j.jog.2012.07.007 |bibcode=2012JGeo...61...68S |hdl=2060/20140005985 |hdl-access=free }}</ref>