  Hot Jupiters orbiting rapidly rotating stars on inclined orbits undergo
tidally induced nodal precession measurable over several years of observations.
The Hot Jupiters WASP-33 b and KELT-9 b are particularly interesting targets as
they are among the hottest planets found to date, orbiting relatively massive
stars. Here, we analyze archival and new data that span 11 and 5 years for
WASP-33 b and KELT-9 b, respectively, in order to to model and improve upon
their tidal precession parameters. Our work confirms the nodal precession for
WASP-33 b and presents the first clear detection of the precession of KELT-9 b.
We determine that WASP-33 and KELT-9 have gravitational quadrupole moments
$(6.3^{+1.2}_{-0.8})\times10^{-5}$ and $(3.26^{+0.93}_{-0.80})\times10^{-4}$,
respectively. We estimate the planets' precession periods to be
$1460^{+170}_{-130}$ years and $890^{+200}_{-140}$ years, respectively, and
that they will cease to transit their host stars around the years
$2090^{+17}_{-10}$~CE and $2074^{+12}_{-10}$~CE, respectively. Additionally, we
investigate both planets' tidal and orbital evolution, suggesting that a
high-eccentricity tidal migration scenario is possible to produce both system
architectures and that they will most likely not be engulfed by their hosts
before the end of their main sequence lifetimes.
