EntityQ1602577· pop 15· linked from 11 articlesheliotropeSign in to savemeasuring instrumentConnectionssurveyingEntityGermanyCountryIndiaCountryGreekEntityCarl Friedrich GaussEntityInternational Standard Book NumberEntitymirrorEntitymathematicianEntitydigital object identifierEntityHeliosEntitysunlightEntitystylistic deviceEntityGeorge EverestEntitytriangulationEntityNational Oceanic and Atmospheric AdministrationEntityoptical aberrationEntityMount ShastaEntityheliographEntityretroreflectorEntityGreat Trigonometric SurveyEntityCategoriesCarl Friedrich GaussSurveying instruments