2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117562We present a new test for a possible Mach-Sciama dependence of the Gravitational constant G. According to Ernst Mach (1838-1916), the gravitational interaction depends on the distribution of masses in the universe. A corresponding hypothesis of Sciama (1953) on the gravitational constant, $c^2/G = \sum m_i/r_i$, can be tested since the elliptic earth orbit should then cause minute annual variations in G. The test is performed by analyzing the gravity signals of a network of superconducting gravimeters (SG) which reach a precision of $10^{-10} m/s^2$. After reducing the signal by modelling tidal, meteorologic and geophysical effects, no significant evidence for the above dependence is found.8 pages, figures separate. To include figures, run pdflatex as described in the source. Paper with figures included can be obtained from http://www.alexander-unzicker.de/research.htmlGeneral Relativity and Quantum CosmologyAstrophysicstext