WAnscombe's quartetWChevalineWJanuary 1973 lunar eclipseWJune 1973 lunar eclipseWJuly 1973 lunar eclipseWDecember 1973 lunar eclipseWRosenhan experimentWSolar eclipse of December 24, 1973WSolar eclipse of January 4, 1973WSolar eclipse of June 30, 1973WSolis PlanumWTwin Earth thought experimentWUppsala General Catalogue
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