Thus, for example, the path of a planet orbiting around a star is the projection of a geodesic of the curved 4-dimensional spacetime geometry around the
measurements 撤销 DIN 5 Technical drawings - Axonometric projections, Isometric projection 撤销 DIN ISO 5456-1, DIN ISO 5456-2, DIN ISO 5456-3, DIN ISO 5456-4 ISO