The Milky Way galaxy has several spiral arms, each of which is roughly a logarithmic spiral with pitch of about 12 degrees. Usually the Sun (or Moon for nocturnal species) is the only light source and flying that way will result in a practically straight line. They are used to having the light source at a constant angle to their flight path. The approach of an insect to a light source.Their sharpest view is at an angle to their direction of flight this angle is the same as the spiral's pitch. The approach of a hawk to its prey in classical pursuit, assuming the prey travels in a straight line.In several natural phenomena one may find curves that are close to being logarithmic spirals. The logarithmic spiral can be distinguished from the Archimedean spiral by the fact that the distances between the turnings of a logarithmic spiral increase in geometric progression, while in an Archimedean spiral these distances are constant. More than a century later, the curve was discussed by Descartes (1638), and later extensively investigated by Jacob Bernoulli, who called it Spira mirabilis, "the marvelous spiral". The first to describe a logarithmic spiral was Albrecht Dürer (1525) who called it an "eternal line" ("ewige Linie"). Logarithmic spiral ( pitch 10°) A section of the Mandelbrot set following a logarithmic spiralĪ logarithmic spiral, equiangular spiral, or growth spiral is a self-similar spiral curve that often appears in nature. For for the Italian film, see Spira Mirabilis (film). For the orchestra, see Spira Mirabilis (orchestra).
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