refraction

• the amount by which a propagating wave is bent
• the change in direction of a propagating wave (light or sound) when passing from one medium to another
• The act of refracting, or the state of being refracted
• The change in the direction of ray of light, heat, or the like, when it enters obliquely a medium of a different density from that through which it has previously moved
• The change in the direction of a ray of light, and, consequently, in the apparent position of a heavenly body from which it emanates, arising from its passage through the earth´s atmosphere
• The correction which is to be deducted from the apparent altitude of a heavenly body on account of atmospheric refraction, in order to obtain the true altitude

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