| The photons that reached its senses followed paths that varied slightly from the straight-line geodesics of flat spacetime. |
| Since no strong theoretical reason exists to confine the analysis to geodesics, Stephenson and Zelen's measure might be preferable. |
| Since geodesics aren't always straight, light doesn't always travel in straight lines. |
| Those distortions guide the moving masses along straight-line geodesics, which look like the curved trajectories that physicists call orbits. |
| Hence, we can produce poles, polars, points, geodesics, angles, and so forth readily by converting back to the Poincare model. |
| He then considered the problem of when the geodesics on a surface could be represented as straight lines on the plane. |
