period variation

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• Variation (astronomy) — Variation in astronomy is used to refer to a perturbation of the orbit of a body, such as a planet or satellite.Specifically, in the case of the motion of the Moon around the Earth, the Variation is a type of perturbation caused by the action of… …   Wikipedia

• Period (gene) — period serina Identifiers Organism D. melanogaster Symbol per Entrez …   Wikipedia

• period — of an oscillation is the smallest increment of time in which one complete sequence of variation in displacement occurs or, in other words, the amount of time required to complete one cycle of vibration. Period is the inverse of frequency and is… …   Mechanics glossary

• period-luminosity relation — /pear ee euhd looh meuh nos i tee/, Astron. the relationship between the period of light variation and of the absolute magnitude of Cepheid variable stars. [1945 50] * * * …   Universalium

• period — Synonyms and related words: Alexandrine, Archean, Archeozoic, Cambrian, Carboniferous, Cenozoic, Comanchean, Cretaceous, Devonian, Eocene, Glacial, Holocene, Lower Cretaceous, Lower Tertiary, Mesozoic, Miocene, Mississippian, Oligocene, Paleocene …   Moby Thesaurus

• period-luminosity law — noun : a law in astronomy: the period of light variation of a Cepheid variable is in direct relation with its absolute magnitude whereby intrinsically fainter stars have the shorter periods …   Useful english dictionary

• period-luminosity relation — /pear ee euhd looh meuh nos i tee/, Astron. the relationship between the period of light variation and of the absolute magnitude of Cepheid variable stars. [1945 50] …   Useful english dictionary

• variation — Synonyms and related words: Nachtmusik, Proteus, aberrancy, aberration, about face, absolute music, accommodation, adaptation, adjustment, air varie, aleatory, aleatory music, allotropism, allotropy, alteration, altering, alternation,… …   Moby Thesaurus

• variation — /vɛəriˈeɪʃən / (say vairree ayshuhn) noun 1. the act or process of varying; change in condition, character, degree, etc. 2. an instance of this. 3. amount or rate of change. 4. a different form of something; a variant. 5. Music a. the… …  

• Solar variation — Solar variations are changes in the amount of solar radiation emitted by the Sun. There are periodic components to these variations, the principal one being the 11 year solar cycle (or sunspot cycle), as well as aperiodic fluctuations. Solar… …   Wikipedia

• Critical period hypothesis — The critical period hypothesis is the subject of a long standing debate in linguistics and language acquisition over the extent to which the ability to acquire language is biologically linked to age. The hypothesis claims that there is an ideal… …   Wikipedia