**Syzygies** — Syzygy Syz y*gy (s[i^]z [i^]*j[y^]), n.; pl. {Syzygies} ( j[i^]z). [L. syzygia a joining together, conjunction, Gr. syzygi a; sy n with + zeygny nai to join, zygo n yoke: cf. F. syzygie. See {Yoke}, n.] 1. (Astron.) The point of an orbit, as of… … The Collaborative International Dictionary of English

**Timeline of astronomy** — Timeline of astronomy2500 BCMany ancient sites are thought to have astronomical significance, such as the Ancient Egyptian pyramids, Harappan shell instruments, British megaliths, and buildings in China and Latin America.In Lothal, the ancient… … Wikipedia

**Syzygy** — Syz y*gy (s[i^]z [i^]*j[y^]), n.; pl. {Syzygies} ( j[i^]z). [L. syzygia a joining together, conjunction, Gr. syzygi a; sy n with + zeygny nai to join, zygo n yoke: cf. F. syzygie. See {Yoke}, n.] 1. (Astron.) The point of an orbit, as of the moon … The Collaborative International Dictionary of English

**Homogeneous coordinate ring** — In algebraic geometry, the homogeneous coordinate ring R of an algebraic variety V given as a subvariety of projective space of a given dimension N is by definition the quotient ring R = K[X0, X1, X2, ..., XN]/I where I is the homogeneous ideal… … Wikipedia

**Lunar phase** — Moon phase redirects here. For the manga and anime series, see Tsukuyomi: Moon Phase. Animation of the Moon as it cycles through its phases, as seen from the Northern Hemisphere. The apparent wobbling of the Moon is known as libration. The… … Wikipedia

**Canonical bundle** — In mathematics, the canonical bundle of a non singular algebraic variety V of dimension n is the line bundle which is the nth exterior power of the cotangent bundle Ω on V. Over the complex numbers, it is the determinant bundle of holomorphic n… … Wikipedia

**Eclipse cycle** — Animated graph of a the paths of totality of a solar eclipse cycle. Eclipses may occur repeatedly, separated by certain intervals of time: these intervals are called eclipse cycles.[1] The series of eclipses separated by a repeat of one of these… … Wikipedia

**Gnosticism** — This article is part of a series on Gnosticism History of Gnosticism … Wikipedia

**Syzygy** — In broadest terms, Syzygy (IPAEng|ˈsɪzɪʤi) is a kind of unity, especially through coordination or alignment, most commonly used in the astronomical and/or astrological sense. [http://dictionary.reference.com/search?q=Syzygy x=56 y=22 Syzygy… … Wikipedia

**Leap year** — A leap year (or intercalary year) is a year containing one or more extra days (or, in the case of lunisolar calendars, an extra month) in order to keep the calendar year synchronised with the astronomical or seasonal year. For example, in the… … Wikipedia