# Errata 2013

#### Time Scales, Section B

• Page B50, Equinox Method of reduction from the GCRS — rigorous formulae

sin ϵ cos ψ sin φ̄ + cos ϵ cos φ̄

• Page B51, Offsets of the Pole and Origin at J2000.0

For F-W IAU 2006, in the column φB

replace 6.891 with 6.819

• Page B54, in the formulae c:

replace $-0.0001\,0415\,5607\ T^3$
with $+2.9710\ \times\ 10^{-8}\ T^3$

and in the formulae c':

replace $-0.0001\,0417\,7728\ T^3$
with $+7.5882\ \times\ 10^{-9}\ T^3$

The Astronomical Almanac Online! 2014
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