ln2 value is _math.c (cpython)

[matanya_stroh]

Hi. I'm not so sure where to ask it, so I'm trying here.
m looking at the source code of _math.c (line 25):

#if !defined(HAVE_ACOSH) || !defined(HAVE_ASINH)
static const double ln2 = 6.93147180559945286227E-01;
static const double two_pow_p28 = 268435456.0; /* 2**28 */

and I noticed that ln2 value is different from the what wolframalpha value for ln2. (bald part is the difference)

ln2 = 0.693147180559945286227 (cpython)

ln2 = 0.6931471805599453094172321214581 (wolframalpha)

ln2 = 0.693147180559945309417232121458 (wikipedia)

so my question is why there is a difference? what am I missing?

I asked this question also in Stack-overflow if it's matter - stackoverflow question