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The Indian Standard Time was adopted on 1 January 1906 during the British era with the phasing out of its precursor Madras Time (Railway Time), [2] and after Independence in 1947, the Union government established IST as the official time for the whole country, although Kolkata and Mumbai retained their own local time (known as Calcutta Time and Bombay Time) until 1948 and 1955, respectively. [3]
The submultiple centistokes (cSt) is often used instead, 1 cSt = 1 mm 2 ·s −1 = 10 −6 m 2 ·s −1. 1 cSt is 1 cP divided by 1000 kg/m^3, close to the density of water. The kinematic viscosity of water at 20 °C is about 1 cSt.
As seen from above the Earth's north pole, a star's local hour angle (LHA) for an observer near New York (red dot).Also depicted are the star's right ascension and Greenwich hour angle (GHA), the local mean sidereal time (LMST) and Greenwich mean sidereal time (GMST).
France, which had adopted Paris time on 14 March 1891 and Greenwich Mean Time on 9 March 1911, [22] was switched to CET. Spain switched to CET. [19] After World War II Monaco, Andorra and Gibraltar implemented CET. [19] Portugal used CET in the years 1966–1976 and 1992–1996. United Kingdom
Time zones of South Asia, with Nepal Standard Time indicated. Nepal Standard Time (NPT) is the time zone for Nepal. [1] With a time offset from Coordinated Universal Time (UTC) of UTC+05:45 all over Nepal, [2] [3] it is one of only three time zones with a 45-minute offset from UTC.
Pale colours: Standard time observed all year Dark colours: Summer time observed Central European Summer Time (CEST, UTC+02:00), sometimes referred to as Central European Daylight Time (CEDT), [1] is the standard clock time observed during the period of summer daylight-saving in those European countries which observe Central European Time (CET; UTC+01:00) during the other part of the year.
In 1981, Malaysia decided to standardise the time across its territories to a uniform UTC+08:00. Singapore elected to follow suit, citing business and travel schedules. [14] [15] The change took effect on New Year's Day (1 January) 1982 when Singapore moved half an hour forward on New Year's Eve (31 December) 1981 at 11:30 pm creating "Singapore Standard Time" (SST) or "Singapore Time" (SGT). [16]
The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound.