Celestial navigation Celestial navigation Celestial navigation, also known as astronavigation, is the ancient and modern practice of position fixing that enables a navigator to transition through a space without having to rely on estimated calculations, or dead reckoning, to know their position. Celestial navigation uses "sights", or angular measurements taken between a celestial body (e.g. the Sun, the Moon, a planet, or a star) and the visible horizon. The Sun is most commonly used, but navigators can also use the Moon, a planet, Polaris, or one of 57 other navigational stars whose coordinates are tabulated in the nautical almanac and air almanacs.
Fear of crossing streets traumatic event. Sometimes this behavior may be misinterpreted during PTSD symptom assessment as a caution (i.e., a normal learning behavior) rather than fear (which is an abnormal avoidant behavior). Fear of crossing streets may also result from an anticipatory anxiety related to person's limited mobility due to stiff person syndrome (SPS). In fact a person with SPS crossing a street may develop attacks of increasing stiffness or spasms. Dromophobia may be present in people, especially children, with autism, since crossing a road involves complex skills, such as judging the speed of an approaching car. Fear of crossing streets The fear