Title:DynamicsoftheEarth-MoonsystemandestablishmentofLunarspatio-temporalreferencesystem Speaker:WeiTian   Abstract:Theplanetaryandlunarephemeris,asadynamicreferenceframeoftheSolarsystem,playsimportantrolesinmanyfieldsofastronomyanddeepspaceexploration.ThepresentationwillintroduceacoompletelynewplanetaryandlunarephemerisPETREL19.ConsideringtheparticularityoftheEarth-Moonsystemintheconstructionofplanetaryandlunarephemeris,thereportwilldiscussthekeyroleoflunarlaserrangingtechnologyintheconstructionofthelunarephemerisandtheestablishmentofthespatio-temporaldatumonthelunarsurface.   Bio:WeiTianisanassociateresearcherattheShanghaiAstronomicalObservatory,ChineseAcademyofScience.In2013,hegraduatedfromtheinstituteofplanetarygeodesy,TechnicalUniversityofDresden(TUD).Afteralonglaboriouswork,thespeakersystematicallyconstructedanewplanetaryandlunar(numerical)ephemerisPETREL19.Thisworkwasincludedinthetriennialreport(‪2022-2024)ofIAUCommissionX-2solarsystemephemerides(https://www.iau.org/static/science/scientific_bodies/commissions/x2/commission-x2-triennial-report-2021-2024.pdf),togetherwiththeAmericanDEephemeris,theFrenchINPOPephemerisandtheRussianEPMephemeris,anditfilledthegapinthefieldofplanetaryandlunarephemerisinChina.Atpresent,heismainlyengagedinbasicresearchonthedynamicsofthesolarsystemandtheconstructionofplanetaryandlunarephemeris.     Time:14:00-15:00,25/Dec,WednesdayVenue:Room506(Largeseminarroom),DepartmentofAstronomy Youcanalsoaccessthecolloquiumvia: https://www.koushare.com/space/329883/live-series/4614