where does the length of a second come from
Second Though the historical definition of the unit was based upon this division of the Earth's rotation cycle, the formal definition in the International System of Units SI is a much steadier timekeeper: 1 second is defined to be exactly 9 192 631 770 cycles of a Caesium atomic clock.[1][2][3] Because the Earth's rotation varies and is also slowing ever so slightly, a leap second is added to clock time[nb 2] to keep clocks in sync with Earth's rotation.
Second The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI).[1][2] It is qualitatively defined as the second division of the hour by sixty, the first division by sixty being the minute.[3] The SI definition of second is "the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom".[1][4] Seconds may be measured using a mechanical, electrical or an atomic clock.
Shekhinah This term does not occur in the Bible, and is from rabbinic literature.[2]:148[3][4]
Masoretic Text The Masoretic[1] Text (MT or