Well according to this site it is allegedly 67.99 degrees

"The Pyramid of Cestius was built between 18 BC and 12 BC as a tomb for Gaius Cestius, a magistrate in Rome, and a member of the priestly college of the Epulones, who supervised religious feasts and public banquets. The inscription on the pyramid (see 1st photo below) reads
C · CESTIVS · L · F · POB · EPULO · PR · TR · PL
VII · VIR · EPOLONVM
which translates as: "Gaius Cestius, son of Lucius, of the gens Pobilia, member of the College of Epulones, praetor, tribune of the plebs, septemvir of the Epulones". The pyramid was built in only 330 days, as ordered by Cestius in his will. The pyramid is 120 feet tall and 97 feet wide on each side at the base, and it rises at a much sharper angle than the famous pyramids in Egypt. It has a travertine foundation, with the pyramid made of concrete covered by brick, then covered by sheets of white marble. A larger pyramid, the Pyramid of Romulus, once stood near Castel Sant'Angelo, but it was demolished in the 16th century and its marble was used in the stairs of St. Peter's Basilica, leaving the Pyramid of Cestius as the only Pyramid in Rome."

[www.jeffbondono.com]

97 / 2 = 48.5 ... 120 / 48.5 = 2.4742268 and this is the tan of 67.99 degrees

Apparently he is an author

[www.amazon.ca]

Cheers
db

"There is nothing as impenetrable as a closed mind"
and ..." if everything is a coincidence what is the point of studying or measuring or analyzing anything ?" db