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5 result(s) found where the letter starting with "J"

Jitter

A measure of the short term frequency stability of the oscillator. It applies only to rectangular wave forms. It is measured as the uncertainty in the location of one edge of the signal with respect to other edges. It is usually specified in units of time (nano-seconds or pico-seconds), but may also be specified in degrees. This measurement has particular application to the digital communications industry.
 

Julian Date (JD)
The Julian Day number followed by the fraction of the day elapsed since the preceding noon (1200 UT). {Example: The date 1900 January (1) 0.5 day UT corresponds to JD = 2 415 020}.
 

Julian Day
Obtained by counting days from the starting point of noon on 1 January 4713 B.C. (Julian Day zero). One way of telling what day it is with the least possible ambiguity
 

Julian Day - Modified Julian Day (MJD)
Equal to the Julian day. Shifted so its origin occurs at midnight on 17 November 1858. The MJD differs from the Julian date by exactly 2 400 000.5 days.
 

Julian Day Number (JDN)
The number of a specific day from a continuous day count having an initial origin of 1200 UT on 1 January 4713 BC, the start of Julian day zero. {Example: The day extending from 1900 January (1) 0.5 day UT to 1900 January 1.5 days UT has the number 2 415 020}.