mean solar second การใช้

• This confirmed the unsuitability of the mean solar second of Universal Time as a precision measure of time interval.
• This confirmed the unsuitability of the mean solar second of Universal Time as a measure of time interval for the most precise purposes.
• The atomic second, often called the SI second, was intended to agree with the ephemeris second based on Newcomb's work, which in turn makes it agree with the mean solar second of the mid-19th century . ( McCarthy & Seidelman, 2009, pp . 81 & ndash; 2, 191 & ndash; 7)
• Following this, an astronomical conference held in Paris in 1950 recommended " that in all cases where the mean solar second is unsatisfactory as a unit of time by reason of its variability, the unit adopted should be the sidereal year at 1900.0, that the time reckoned in this unit be designated " ephemeris time " ", and gave Clemence's formula ( see Definition of ephemeris time ( 1952 ) ) for translating mean solar time to ephemeris time.