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Hourglass Field was the popular name for an auxiliary landing field operated by the United States Navy before and during World War II in the northern part of San Diego, California. It is remembered as a racetrack in the regional road racing circuit and because a crackdown on unauthorized drag racing there triggered the El Cajon Boulevard Riot.
Chronometry[a] or horology[b] (lit. 'the study of time') is the science studying the measurement of time and timekeeping. [3] Chronometry enables the establishment of standard measurements of time, which have applications in a broad range of social and scientific areas. Horology usually refers specifically to the study of mechanical timekeeping ...
History of timekeeping devices. A marine sandglass. It is related to the hourglass, nowadays often used symbolically to represent the concept of time. The history of timekeeping devices dates back to when ancient civilizations first observed astronomical bodies as they moved across the sky. Devices and methods for keeping time have gradually ...
The Armed Forces Reserve Medal (AFRM) is a service medal of the United States Armed Forces that has existed since 1958. The medal recognizes service performed by members of the reserve components and is awarded to both officers and enlisted personnel. The medal is considered a successor award to the Naval Reserve Medal and the Marine Corps ...
An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one due to gravity.
Inducing the sense of the passage of time, the hourglass recalls an essential reality: the limited duration of earthly existence. The hourglass is thus associated with the immutable cycles of birth and death and with the notions of aging, fatality and irreversibility. The two parts of the hourglass can be likened to heaven and earth. [54] [56] [51]
The Huygens–Fresnel principle (named after Dutch physicist Christiaan Huygens and French physicist Augustin-Jean Fresnel) states that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere. [1] The sum of these spherical wavelets forms a new wavefront.
Jiffy (time) Jiffy can be an informal term for any unspecified short period, as in "I will be back in a jiffy". From this, it has acquired a number of more precise applications as the name of multiple units of measurement, each used to express or measure very brief durations of time. First attested in 1780, [1] the word's origin is unclear ...
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