And just because this is The Dope, one will note that defining the tropics to this accuracy is not always meaningful. One thousandth of a degree of latitude is 111 meters.
The tropics are currently moving towards the Equator at about 46.8” per century, which is about 15 meters a year.
This is one of the Milankovitch cycles, and over the period of the cycle has a real influence on climate.
My father enjoyed showing people a picture of a sign on the road next to a line painted across the road denoting the Tropic of Capricorn, and pointing out that the real line was marching north at 4cm a day.