Tag: second

The second (symbol: s) is the base unit of time in the International System of Units (SI) and is also a unit of time in other systems of measurement (abbreviated s or sec). Between 1000 (when al-Biruni used seconds) and 1960 the second was defined as 1/86,400 of a mean solar day (that definition still applies in some astronomical and legal contexts). Between 1960 and 1967, it was defined in terms of the period of the Earth’s orbit around the Sun in 1900, but it is now defined more precisely in atomic terms. Seconds may be measured using mechanical, electric or atomic clocks.
19th- and 20th-century astronomical observations revealed that the mean solar day is slowly but measurably lengthening and the length of a tropical year is not entirely predictable either; thus the sun–earth motion is no longer considered a suitable basis for definition. With the advent of atomic clocks, it became feasible to define the second based on fundamental properties of nature. Since 1967, the second has…

New SD Card Spec Supports 2TB Capacities

The SD Association has announced a new card spec dubbed SDXC (eXtended Capacity) that can support memory capacities up to 2TB with read/write speeds to 104MB per second. More: continued…

Accessing Internet at 640 Gb/s?

University of Sydney physicists have developed an optical chip that could potentially improve ‘Internet speeds to up to 100 times faster than current Australia’s networks.’ He adds that these chips…

U.K.’s fastest supercomputer unveiled

High-End Computing Terascale Resource–can handle 63 trillion calculations per second, which is the equivalent processing power of 12,000 desktop systems and four times faster than its predecessor. The amt. of…

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