A system (100,200) for detecting turbulent air located between a light source and an observer, the system comprising: an optical sensor associated with the observer that is configured to receive light from the light source and to produce an indication of the light; a processor configured to receive the indication of the light, to quantify scintillation in the light based upon the indication, and to identify turbulent air between the light source and the optical sensor based upon the scintillation in the light; a feedback device configured to provide a notification when turbulent air is identified; and either wherein the system further comprises: two sensors including the optical sensor; the light source is arranged to advance in space; and the processor is further configured to determine a distance to the turbulent air based upon a time difference occurring between two different observations of scintillation of light from the light source and upon a position or velocity of the light source, wherein the two different observations are taken by the two different optical sensors respectively, or wherein the system further comprises: two light sources including the light source; the optical sensor is arranged to advance in space; and the processor is further configured to determine a distance to the turbulent air based upon a time difference occurring between two different observations of scintillation of light from the two different light sources respectively and upon a position or velocity of the optical sensor, wherein the two different observations are taken by the optical sensor. an optical sensor associated with the observer that is configured to receive light from the light source and to produce an indication of the light; a processor configured to receive the indication of the light, to quantify scintillation in the light based upon the indication, and to identify turbulent air between the light source and the optical sensor based upon the scintillation in the light; a feedback device configured to provide a notification when turbulent air is identified; and either wherein the system further comprises: two sensors including the optical sensor; the light source is arranged to advance in space; and the processor is further configured to determine a distance to the turbulent air based upon a time difference occurring between two different observations of scintillation of light from the light source and upon a position or velocity of the light source, wherein the two different observations are taken by the two different optical sensors respectively, two sensors including the optical sensor; the light source is arranged to advance in space; and the processor is further configured to determine a distance to the turbulent air based upon a time difference occurring between two different observations of scintillation of light from the light source and upon a position or velocity of the light source, wherein the two different observations are taken by the two different optical sensors respectively, two light sources including the light source; the optical sensor is arranged to advance in space; and the processor is further configured to determine a distance to the turbulent air based upon a time difference occurring between two different observations of scintillation of light from the two different light sources respectively and upon a position or velocity of the optical sensor, wherein the two different observations are taken by the optical sensor.