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occult

adj. not apparent to the naked eye; not easily determined or detected. For example occult blood is blood present in such small quantities that it can only be detected ...

occultation

occultation   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

... The passage of one astronomical body in front of another, usually the obscuration of a star by the Moon; strictly speaking, a solar eclipse, when the Moon passes in front of the Sun, is a special form of occultation. Precise timings of lunar occultations of stars help to refine our knowledge of the Moon’s orbit. Occultations of stars by asteroids and planetary satellites can provide improved diameters for the occulting bodies. The Galilean satellites of Jupiter are regularly occulted by the planet. Jupiter’s satellites may occult one another when...

occultation

occultation   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
31 words

...occultation The disappearance of a star, planet, or other celestial body behind the moon or another planet, while it is being observed. A solar eclipse is a form of occultation...

Occultation

Occultation   Quick reference

The Oxford Dictionary of Islam

Reference type:
Subject Reference
Current Version:
2003
Subject:
Religion
Length:
64 words

...Occultation “Hidden” state of the twelfth Shii imam. Shiis believe that during the Lesser Occultation, the imam continued to communicate with the community through four successive appointed agents, the last of whom died in 944 . During the Greater Occultation, which continues to the present, there is no special agent, although Shii jurists are recognized as his agents and the only legitimate interpreters of...

occultation

occultation   Quick reference

A Dictionary of Space Exploration (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

...occultation A temporary obscuring of a star or spacecraft as it passes behind a celestial object, or its atmosphere or rings. Occultations are used to provide information about changes in an orbit, and the structure of objects in space, such as radio sources. When a spacecraft is obscured, it can rotate so that its radio signal is refracted towards the Earth. The point of refraction is known as ‘virtual...

grazing occultation

grazing occultation   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

...occultation A lunar occultation in which the limb of the Moon just touches a star. Such events may produce numerous brief disappearances and reappearances, accurate timings of which can help in determining the Moon’s limb profile. The most useful records of grazing occultations are obtained by teams of observers spread across the predicted ground...

radio occultation

radio occultation   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...occultation The technique of using radio waves transmitted from a spacecraft to probe the atmospheres of planets. The signals received on the Earth as the spacecraft swings behind a planet provide information about both the vertical structures of the planetary ionospheres and the atmospheric density. Monochromatic radio waves provide more accurate measurements than those obtained using stellar occultations...

global ozone monitoring by occultation of stars

global ozone monitoring by occultation of stars   Quick reference

A Dictionary of Space Exploration (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

...global ozone monitoring by occultation of stars ( GOMOS ) An instrument used by the European Space Agency ( ESA ) to monitor and measure ozone in the Earth's atmosphere. GOMOS was carried aboard ESA's Envisat , and programmed to take more than 600 profile measurements each day. This was the first time that a star occultation will be used to measure ozone. The data collected by GOMOS are used for global ozone mapping and for monitoring trends in ozone...

Global Ozone Monitoring by Occultation of Stars

Global Ozone Monitoring by Occultation of Stars   Quick reference

A Dictionary of Weather (3 ed.)

Reference type:
Subject Reference
Current Version:
2023

...Ozone Monitoring by Occultation of Stars ( GOMOS ) An instrument carried by the Envisat satellite to determine the distribution of ozone in the stratosphere . The instrument uses the absorption by ozone of ultraviolet radiation from stars to obtain highly detailed three-dimensional maps of ozone...

occultation

occultation  

The disappearance of a star, planet, or other celestial body behind the moon or another planet, while it is being observed. A solar eclipse is a form of occultation.
Occultation

Occultation  

Reference type:
Overview Page
Subject:
Religion
“Hidden” state of the twelfth Shii imam. Shiis believe that during the Lesser Occultation, the imam continued to communicate with the community through four successive appointed agents, the last of ...
occult

occult   Quick reference

A Dictionary of African Politics

Reference type:
Subject Reference
Current Version:
2019

...occult The realm of supernatural, magical powers. See witchcraft ....

occult

occult   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
10 words

... concealed or hidden; not apparent to the unaided...

occult

occult adj.   Quick reference

Concise Medical Dictionary (10 ed.)

Reference type:
Subject Reference
Current Version:
2020
Subject:
Medicine and health, Clinical Medicine
Length:
40 words

... adj. not apparent to the naked eye; not easily determined or detected. For example occult blood is blood present in such small quantities that it can only be detected microscopically or by chemical testing. See faecal occult blood test...

occult

occult adj.   Quick reference

A Dictionary of Nursing (8 ed.)

Reference type:
Subject Reference
Current Version:
2021
Subject:
Medicine and health
Length:
38 words

... [ŏ- kult ] adj. not apparent to the naked eye; not easily detected. o. blood blood present in such small quantities that it can only be detected microscopically or by chemical testing. See faecal occult blood test...

occult

occult   Quick reference

The Oxford Dictionary of Sports Science & Medicine (3 ed.)

Reference type:
Subject Reference
Current Version:
2007

... In medicine, applied to a condition that is not readily detectable by signs and symptoms, or which is detectable only from microscopic examination or chemical...

occultism

occultism   Reference library

The Continuum Encyclopedia of British Philosophy

Reference type:
Subject Reference
Current Version:
2010
Subject:
Philosophy
Length:
747 words

...morally acceptable of the occult sciences, with the word ‘occultism’ being restricted to magical and divinatory practices. This usage has now been generally adopted in academic circles. In Britain public awareness of ‘occult philosophy’ was ensured with the publication in 1651 of an English translation of Henry Cornelius Agrippa 's Three Books of Occult Philosophy , while popular accounts of the occult sciences began to appear in the late eighteenth century (e.g. Ebenezer Sibly 's A New and Complete Illustration of the Occult Sciences , 1790 ). There...

grazing occultation

grazing occultation  

A lunar occultation in which the limb of the Moon just touches a star. Such events may produce numerous brief disappearances and reappearances, accurate timings of which can help in determining the ...
radio occultation

radio occultation  

The technique of using radio waves transmitted from a spacecraft to probe the atmospheres of planets. The signals received on the Earth as the spacecraft swings behind a planet provide information ...
occulting bar

occulting bar   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

... bar An obstruction placed in the field of view of an eyepiece to hide or occult bright objects so that fainter objects may be seen more...

occulting disk

occulting disk   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

... disk A small disk placed centrally in the field of view of an eyepiece, or at the focal point of a telescope, to hide or occult a bright object so that fainter objects can be seen more readily. An occulting disk may be used, for example, to reveal faint satellites of a planet, or to hide the Sun’s disk in a...

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