Schlieren ( SHLEER-ən; German: [ˈʃliːʁn̩] , German for 'streaks') are optical inhomogeneities in transparent media that are not necessarily visible to the human eye. Schlieren physics developed out of the need to produce high-quality lenses devoid of such inhomogeneities. These inhomogeneities are localized differences in optical path length that cause deviations of light rays, especially by refraction. This light deviation can produce localized brightening, darkening, or even color changes in an image, depending on the directions the rays deviate.
Distance between:
Geneva to Schlieren137 Miles / 221 Kms Lucerne to Schlieren23 Miles / 38 Kms Zürich to Schlieren5 Miles / 8 Kms Basel to Schlieren43 Miles / 68 Kms Bern to Schlieren57 Miles / 92 Kms Lausanne to Schlieren103 Miles / 167 Kms
47.3982611,8.448795