- astronomical sign
- 天文符号
English-Chinese electricity dictionary (电气专业词典). 2013.
astronomical sign
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Astronomical year numbering — is based on AD (Anno Domini)/CE (Common Era) year numbering, but follows normal decimal integer numbering more strictly. Thus, it has a year 0 and the years before that are designated with a minus sign − . The era designations BC (Before… … Wikipedia
Astronomical chronology — Astronomical chronology, or astronomical dating, is a technical method of dating events or artifacts that are associated with astronomical phenomena. Written records of historical events that include descriptions of astronomical phenomena have… … Wikipedia
Astronomical clock — An astronomical clock is a clock with special mechanisms and dials to display astronomical information, such as the relative positions of the sun, moon, zodiacal constellations, and sometimes major planets. DefinitionThe term is loosely used to… … Wikipedia
astronomical map — Introduction any cartographic representation of the stars, galaxies, or surfaces of the planets and the Moon. Modern maps of this kind are based on a coordinate system analagous to geographic latitude and longitude. In most cases, modern… … Universalium
Mirage of astronomical objects — Mock mirage of the setting sun A mirage of an astronomical object is a naturally occurring optical phenomenon, in which light rays are bent to produce distorted or multiple images of an astronomical object. The mirages might be observed for such… … Wikipedia
Coordinate time — In the theory of relativity, it is convenient to express results in terms of a spacetime coordinate system relative to an implied observer. In many (but not all) coordinate systems, an event is specified by one time coordinate and three spatial… … Wikipedia
Archaeology of the Cross and Crucifix — Archæology of the Cross and Crucifix † Catholic Encyclopedia ► Archæology of the Cross and Crucifix I. PRIMITIVE CRUCIFORM SIGNS The sign of the cross, represented in its simplest form by a crossing of two lines at right angles,… … Catholic encyclopedia
Time dilation — This article is about a concept in physics. For the concept in sociology, see time displacement. In the theory of relativity, time dilation is an observed difference of elapsed time between two events as measured by observers either moving… … Wikipedia
1345 — The year 1345 was a Julian calendar year in the 14th century, in the midst of a period in world history often referred to as the Late Middle Ages. During this year on the Asian continent, the several divisions of the old Mongol Empire were in a… … Wikipedia
Thursday — is the fourth day of the week in most western countries and the fourth day of the week in the Judeo Christian calendar, falling between Wednesday and Friday. In countries that adopt the Sunday first convention, it is considered the fifth day of… … Wikipedia
Hindu chronology — The subject of Hindu chronology divides naturally into three parts: the calendar, the eras, and other reckonings. The Calendar The Hindus have had, from very ancient times, the system of lunisolar cycles, made by the combination of solar years,… … Wikipedia
