- Star Tales - Ophiuchus (ianridpath.com)
Ophiuchus (pronounced off-ee-YOO-cuss) represents a man grasping a huge snake with both hands, the head of the snake in his left hand and its tail in his right hand. The snake is represented by a separate constellation, Serpens, which is unique among the 88 constellations in being divided into two halves, the head on one side of Ophiuchus and the tail on the other. The mythologists such as Aratus and Hyginus described the snake as being coiled around the waist of Ophiuchus, and that is how it was shown on early illustrations, including Dürer’s hemisphere of 1515; but from Bayer’s chart onwards it was usually shown passing either across his body or between his legs.
passage through the ecliptic
- Natural number (Wikipedia)
In mathematics, the natural numbers are the numbers 1, 2, 3, etc., possibly including 0 as well. Some definitions, including the standard ISO 80000-2, begin the natural numbers with 0, corresponding to the non-negative integers 0, 1, 2, 3, …, whereas others start with 1, corresponding to the positive integers 1, 2, 3, … Texts that exclude zero from the natural numbers sometimes refer to the natural numbers together with zero as the whole numbers, while in other writings, that term is used instead for the integers (including negative integers). In common language, particularly in primary school education, natural numbers may be called counting numbers to intuitively exclude the negative integers and zero, and also to contrast the discreteness of counting to the continuity of measurement—a hallmark characteristic of real numbers.
- Ophiuchus (Wikipedia)
Ophiuchus (/ˌɒfiˈjuːkəs/) is a large constellation straddling the celestial equator. Its name comes from the Ancient Greek ὀφιοῦχος (ophioûkhos), meaning “serpent-bearer”, and it is commonly represented as a man grasping a snake. The serpent is represented by the constellation Serpens. Ophiuchus was one of the 48 constellations listed by the 2nd-century astronomer Ptolemy, and it remains one of the 88 modern constellations. An old alternative name for the constellation was Serpentarius (/ˌsɜːrpənˈtɛəriəs/).
