Configurations


Also found in: Dictionary, Thesaurus, Medical, Legal, Wikipedia.

Configurations

 

in astronomy, the characteristic relative positions of the sun, planets, moon, and other bodies of the solar system on the celestial sphere. Of greatest interest are the planetary configurations (see Figure 1).

Figure 1. Planetary configurations

In the case of Mercury and Venus, which are known as the inferior planets because they revolve within the earth’s orbit, we distinguish between superior and inferior conjunctions with the sun. At these conjunctions, the planet and the sun have the same celestial longitude. Eastern and western elongations correspond to the greatest apparent angular distance of the planet from the sun. The inferior planets at superior conjunction are situated behind the sun, and being hidden by its rays are inaccessible to observation. Directly before inferior conjunction and after it, the inferior planets are visible as a narrow crescent. In some cases, at inferior conjunction, such planets can pass across the sun’s disk (transit of planets across the sun’s disk). At the elongations, the inferior planets have the form of a bright half-disk. The values of the angular distances of the planets at the moment of elongation vary somewhat because of the ellipticity of the planets’ orbits. For Mercury it is about 28°, for Venus about 48°.

For superior planets (planets whose orbits are outside the earth’s orbit), we distinguish between conjunction with the sun, opposition, and eastern and western quadratures. At conjunction with the sun, the planet has the same longitude as the sun. At opposition, the celestial longitudes of the planet and the sun differ by 180°. Finally, at the eastern and western quadratures, the difference between the celestial longitudes of the planet and the sun measures 90°, with the planet in the first case located to the east of the sun, and in the second, to the west of the sun. The superior planets are not visible near the conjunctions. The best conditions for their observation are near the oppositions, when the planets are closest to the earth and have the sunlit hemisphere presented to it.

The configurations of the moon, asteroids, comets, and space probes are determined in the same manner as the planetary configurations. The configurations of the moon are characterized by the lunar phases. For example, a new moon begins at the conjunction of the moon with the sun and a full moon begins at the opposition. The first and last quarters are observed when the moon is at the eastern and western quadratures, respectively. Data on all the planetary configurations, conjunctions of the planets with the moon, and the conjunctions of the planets with each other, as well as the phases of the moon, are published in astronomical yearbooks.

References in periodicals archive ?
Intelligent Compliance -- MetaSolv Configuration Management provides highly flexible network-wide auditing and reporting of detailed network configuration data, as opposed to tools that only validate data structures, which are generally not sufficiently representative of the configuration accuracy.
Also last week, Configuresoft announced ECM Management Extensions (ECMMX) for Microsoft's Desired Configuration Monitoring (DCM), embedding Configuresoft's industry proven regulatory and security compliance validation across the heterogeneous enterprise--from within the Microsoft management framework.
6 automates previously manual processes of assessing host configurations and then gives security teams a unique new tool to instantly and dynamically synthesize that data in a way that simply wasn't possible before.
ECM's new dashboards correlate configuration and change tracking information with compliance standards.
VoyenceControl NG is the industry's first solution to automate the entire configuration management lifecycle -- including design, change and compliance, allowing MSPs to quickly overcome the challenges associated with network configuration and change management.
That person is your configuration manager, your CM Man.
Of everything that goes into the design of a diecast component, die configuration is arguably the most crucial.
has launched ConfigSENTRY, an innovative application that gives customers a single point of control over the configuration of devices across their network.
Their calculational procedure weights the configurations it samples with a guessed importance function, and it corrects and refines the guessed importance function as it goes.
Effective IT service management requires a comprehensive federated configuration management database (CMDB).
RICHARDSON, Texas -- Voyence, a pioneer in automated network change and configuration management (NCCM) solutions, today simplified disaster recovery procedures with the introduction of its new Geo-Diverse High Availability solution for VoyenceControl NG.
Planar's DA4 architecture is designed to connect to multiple graphics controllers to support multiple head configurations and provide the versatility to view multi-modality studies.