Break-circuit chronometer

A precision clock. Electronic chronometers often use a highly accurate and stable crystal oscillator, followed by a string of multivibrators to reduce the crystal frequency to an ...

chronometer

Jewelry; General jewelry

A watch whose timekeeping has been tested and certified for maximum accuracy according to standards set by the Swiss Official Chronometer Control (Contrôle Officiel Suisse des ...

subtropical

Earth science; Mapping science

Relating to the warmest region of the Temperate Zones that border on the Torrid Zone.

sky

Earth science; Mapping science

The region above and beyond the Earth, as it is seen looking up from the ground. Sky looks blue during the day and dark at night.

South Pole

Earth science; Mapping science

The most southern point of the Earth. The South Pole is the southern end of the axis on which the Earth rotates.

prime meridian

Earth science; Mapping science

The line of longitude that passes through the town of Greenwich, England, and that measures 0 degree. It is the line from which other longitude lines are measured.

planet

Earth science; Mapping science

A celestial body revolving around a sun in a nearly circular orbit. This definition excludes comets, which have highly elliptical orbits. However, it may also exclude some of ...

area of error

Earth science; Mapping science

A figure within which the true location of a point whose location has been determined by measurement is believed to lie, with stated degree of probability.

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Industry/Domain: Government Category: U.S. election

Dead zone

The relatively quiet period of a campaign season that usually falls between the Florida primary and the contests held in Arizona and Michigan. Within ...