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?? ???????? ????-? ??? ????????? ???? time .gov ??????????? ?????? ????? ???? ????????? ?

??? ??????? ????? ???????? ??????? ????? (??????) ?? ????????? ??????, ?? ????????? ???? ?????? ??????? ?????? ??????????? ????????? ???? (?????) ??? ?????? ????????? ??? ?????? (?????) ????? ????????? ???? ???? ??? ??? ???? ??????? ?????? ???? ?????? ??? ???????????? ??????? ???? ????????? ??? ???? ????????? ???? ??????????? ??????????? ???? ??????? ?????? ???? ??? ????? ???? ????? ??????? ??? ??? ???????? ???????? ?????-?? ????? ?????? ?? ????? ??? ????????? ??? ?????? ?????? ????? ?? ??????? ???????? ???? ???????? ???????? ??? ??????? ??? ??? ???? ???? ???? ??? ??????? ???? ??????? ??? ??? ???? ?????? ????? ???? ??? ??????? ??? ??? ??????? ^[?]

?????? ??????? ????????? ????? ???? ??????? ?????? ??? ????????? ???, ^[?]^[?] ?????? ?????? ??? ??????? ???????? ??? ??????????? ???? ?????????????? ???? ?????? ??????? ????????? ???????? ??????? (IERS) ??????? ??? ??? ??? ???? ??? ??????? ??? ???? ????????? ????? ???, ???? ??? ?????? ? ????? ?????? ????? ???????? ?.? ????????? ???? ?? ???? ^[?]^[?]

??? ??????? ??? ???? ?? ????? ???? ?????? ????????? ????????? ???? ???? ?????, ????? ??? ????? ????????? ???? ?????? ??????????????? ?? ?????? ?????????? ??? ?????????? ??? ?????? ?? ??????????? ???? ??? ????????? ????? ?????? ????? ???? ??, ??? ????? ???? ??? ??????? ??????? ?????? ????? ?????????????? ??? ??? ????? ^[?] ??????? ?????? ??????? ????? ??????? ?? ??????? ????-? ???? ??? ? ?????? ?????? ????? ???? ???? ?? ??? ??? ??? ??????? ???? ???? ????????? ?????? ???????? ^[?]^[?]

????????? [ ???????? ]

↑ ^? ^? ?????????, ??????? "Leap Second: ?????? ?? ????? ???????? ??????? ??? ??? ????, ??? ??????" ? www.anandabazar.com ? ???????? ????? ????-??-?? ?
↑ "IERS science background" ? Frankfurt am Main: IERS ? ????? ?? ????? ???? ?????? ??? ???? ??????? ??? ? ???????? ????? ? ????? ???? ?
↑ Gambis, Danie (? ????????? ????)? "Bulletin C 49" ? Paris: IERS ? ?? ?? ???? ?????? ??? ???? ??????? ??? ? ???????? ????? ? ????????? ???? ?
↑ James Vincent (? ????????? ????)? "2015 is getting an extra second and that's a bit of a problem for the internet" ? The Verge ? ?? ????? ???? ?????? ??? ???? ??????? ????
↑ Finkleman, David; Allen, Steve; Seago, John; Seaman, Rob; Seidelmann, P. Kenneth (????)? "The Future of Time: UTC and the Leap Second" ? American Scientist ? 99 (4): 312?319? arXiv : 1106.3141   ? ?????????? 118403321 ? ????? : 10.1511/2011.91.312 ?
↑ "Do not adjust your clock: scientists call time on the leap second" ? The Guardian ? Agence France-Presse? ?? ??????? ?????
↑ Gibney, Elizabeth (?? ??????? ????)? "The leap second's time is up: world votes to stop pausing clocks"? Nature ? 612 (7938): 18? ???????? 0028-0836 ? ????? : 10.1038/d41586-022-03783-5   ? ???????? 36400956 |pmid= ?? ??? ??????? ???? ( ??????? ) ? ?????? : 2022Natur.612...18G ?

????????? [ ???????? ]

[আনন্দবাজার-1] ? ^? ?????????, ??????? "Leap Second: ?????? ?? ????? ???????? ??????? ??? ??? ????, ??? ??????" ? www.anandabazar.com ? ???????? ????? ????-??-?? ?

[2] "IERS science background" ? Frankfurt am Main: IERS ? ????? ?? ????? ???? ?????? ??? ???? ??????? ??? ? ???????? ????? ? ????? ???? ?

[Bulletin_C_49-3] Gambis, Danie (? ????????? ????)? "Bulletin C 49" ? Paris: IERS ? ?? ?? ???? ?????? ??? ???? ??????? ??? ? ???????? ????? ? ????????? ???? ?

[4] James Vincent (? ????????? ????)? "2015 is getting an extra second and that's a bit of a problem for the internet" ? The Verge ? ?? ????? ???? ?????? ??? ???? ??????? ????

[5] Finkleman, David; Allen, Steve; Seago, John; Seaman, Rob; Seidelmann, P. Kenneth (????)? "The Future of Time: UTC and the Leap Second" ? American Scientist ? 99 (4): 312?319? arXiv : 1106.3141   ? ?????????? 118403321 ? ????? : 10.1511/2011.91.312 ?

[AFP-6] "Do not adjust your clock: scientists call time on the leap second" ? The Guardian ? Agence France-Presse? ?? ??????? ?????

[gibney-7] Gibney, Elizabeth (?? ??????? ????)? "The leap second's time is up: world votes to stop pausing clocks"? Nature ? 612 (7938): 18? ???????? 0028-0836 ? ????? : 10.1038/d41586-022-03783-5   ? ???????? 36400956 |pmid= ?? ??? ??????? ???? ( ??????? ) ? ?????? : 2022Natur.612...18G ?

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?? ? ?????? ??? ? ??????
?????? ?????	???? Chronometry Orders of magnitude Metrology
??????????? ???	?????? UTC offset ???? Δ?? DUT1 IERS ????? ??-? ????? ???? ??????????? ????? ???? 12-hour clock 24-hour clock Barycentric Coordinate Time Civil time ??????? ??????? ???? Geocentric Coordinate Time ??????????? ????? ???? ??? ??????? ??? ???? Terrestrial Time ???? ?????
???????? ???	Barycentric Dynamical Time Ephemeris time ??????? ??? ???? ??? ????????
??????????????? ????	Absolute time and space ?????-??? Chronon Continuous time Coordinate time Cosmological decade Discrete time Planck epoch ???????? ???? Proper time ?????????? ?????? Time dilation Gravitational time dilation Time domain T-symmetry
???? ?????????????	???? Astrarium ????? ???? Complication Equation of time History of timekeeping devices Hourglass Marine chronometer Marine sandglass Radio clock Sundial Watch ?? ????
???????	Astronomical Dominical letter Epact ????? ????????? ?????? ?????? Intercalation ??????? ?????? ??????? Lunar Lunisolar Seven-day week Solar Solstice Tropical year Weekday determination Weekday names
???????????? ??? ????????	Dating methodologies ??????????? ???? ?????????????? ????? ?? ????????????????
?????????????? ????????	Galactic year Nuclear time scale Precession Sidereal time
?????? ???	??????? ??? ??? ???? ????? Jiffy Lustrum ????????? ????? ??? Saeculum ??????? Shake Tide ?????? ???
????????? ?????	Chronology Duration Mental chronometry Metric time System time Time value of money Timekeeper