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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Leap second today
From: Andrés Ruiz
Date: 2012 Jul 3, 09:05 +0200
Navigational Algorithms
http://sites.google.com/site/navigationalalgorithms/
From: Andrés Ruiz
Date: 2012 Jul 3, 09:05 +0200
Only for remember:
UTC - Coordinated Universal Time
UT1 - Universal time
TT - Terrestrial Time
TAI - Temps Atomique International - International Atomic Clock Time
TDB - Barycentric Dynamical Time
TAI-UTC (leap seconds) -> BULLETIN C
from 01/07/2012 TAI-UTC = 35.0 s
|UT1-UTC| < 0.9s
The decision to introduce a leap second in UTC to meet this condition is the responsibility of the IERS .
DUT1 = UT1-UTC (+/-0.1 s) -> BULLETIN D
Delta T = 32.184 + (TAI-UTC) - (UT1-UTC);
UT1 = UTC + (UT1-UTC)
TT = TAI + 32.184 = UT1 + delta_t [s]
Nautical Almanac: UT is UT1
Celestial bodies coordinates:
GAST = f( UT1, delta_t )
Star, Planet = f( TT )
Regards,
--
Andrés RuizNavigational Algorithms
http://sites.google.com/site/navigationalalgorithms/
