If you want information on those, look at these upgrade patch files . Fixes a roundoff problem present on some machines. No dates plus or minus 300 years of the present are affected. No change in C version is required. No change in C version is required.
Bug affects only some B.C. dates.
In the main books, equations 18.3.14 and 18.3.16 are missing a minus sign before the ln. The programs and figure are correct. The associated function is called even if xp is not defined, which is an error. There is no corresponding change needed in indexx.for or indexx.c . These are obvious from the respective codes.