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.
Celestial monarch Celestial monarch The celestial monarch ("Hypothymis coelestis") is a species of bird in the family Monarchidae, and one of the most attractive of all the monarch flycatchers, with its spectacular blue crest and large yellow eye-ring (neither of which are illustrated in the facing painting). It is endemic to the Philippines. An alternate name for the celestial monarch is the celestial blue monarch. Two subspecies are recognized: Its natural habitat is subtropical or tropical moist lowland forests. This beautiful insectivore is declining rapidly, with recent surveys revealing its presence at only 10 sites. Widespread and continuing reduction of its lowland