**Clarifications, and corrections
are posted here**

- Periodic table (page 124): the units of the lattice constant are pm, not fm. Many thanks go to Javier Hasbun for spotting this long-standing typo.
- Cherenkov cone angle (page156): By the usual definition of a Cherenkov cone angle (angle between shock
*rays*rather than wavefronts), the left hand side of equation 7.246 should be the cosine of the cone semi-angle, not the sine. I'm very grateful to Alan Watson for gently pointing this out!

Corrections to earlier editions:

- Preface: CUP have changed their websites. They are now http://uk.cambridge.org/ for the UK and http://us.cambridge.org/ for North America.

- The new
*CODATA Recommended Values of the Physical Constants*are now available. The small changes to these values are largely academic for users who work to only a few decimal places, but see http://physics.nist.gov/cuu/Constants/index.html if you need those extra digits (or, in the case of big*G,*fewer digits!)

- Typo on page 23, Equation 2.47. There is a 'theta'
missing in the middle. The expression should read:

Well spotted by Yuki Takahashi. - p.57: the domain for the Poisson distribution (2.550)
is '
*x*= 0,1,2,...' not '*x*=1,2,3,...'

- Page 91 equation 4.19: the hbar and
*i*on the right hand side should both be raised to the power*n.*Thanks to Shawn Kwang for spotting that one.

- The right-hand side of equation 8.115 is actually
equal to the mean collision time rather than the half width at half power,
so should be the reciprocal of what is printed. Pressure broadening increases
(rather than decreases) with pressure! So the entry should read:

- Page 177 top panel needs some clarification - I hope
you are concentrating...

Equation 9.6 returns the GMST at the start (0h UT) of the calendar date in question, D/M/Y, using*T*as the fractional number of Julian centuries between 12h UT on 1 Jan 2000 and this instant. However, the*T*defined in 9.5 uses integer Julian days (as defined in 9.1) and is therefore incompatable with the half day implicit in the GMST calculation. For 9.6 to return the GMST at 0h on D/M/Y you should use the integer JD derived from 9.1 and a value of*T*=(JD-2451544.5)/36525 (which is 9.5 with a half-day correction). The GMST at other times of the day can be calculated quite accurately as an offset from this instant, using the definition of the sidereal second (page 14). In addition, be careful with 9.1. It really is designed for fortran/C integer arithmetic, and may give incorrect answers if implimented in other languages. Here is an improved version of the panel.

- Back cover: 'Professor
Anthony Hewish' should read 'Professor
*Antony*Hewish'.

- Only the hardback edition contains a handy summary of physical constants on the inside of the back cover. However, a pdf file for this is available here, so you can stick it in your paperback and upgrade it!
- Page 14: The entry for 'reyn' should of course come after 'REN' in an alphabetical list, and there are one or two other ordering errors like this, none of them serious. The next edition will contain a table of letters in alphabetical order, for my own use ...
- Page 71. The footnote should add
that when using these equations for the two-body problem (is when
*M*is similar to*m*) occurrences of*M*should be replaced by (*M+m*), in addition to*m*being replaced by the reduced mass.