Due to the oblateness, I would say a spot on the floor of the Arctic Ocean. If we can get to Challenger Deep twice we could certainly get there and back.
I assume there are topological maps of the Ocean floor under the Arctic, although they are probably somewhat ‘confidential’.
Are there any deep mines in Northern Russia or Canada that might come close?
BTW, I was thinking of the planet’s centre of gravity, as used to calculate orbits etc and this may be variable, as well as not necessarily the geometric centre of the Earth.
The maximum depth of the Arctic Ocean is Litke Deep in the Eurasian Basin, at 5,450 m (17,880 ft).
The lowest known point on Earth—the Mariana Trench—lies 10,911 meters (35,797 ft or 5,966 fathoms) below sea level in the Pacific Ocean.
Hi there, it’s not really an answer, the Wiki article states that:
Litke Deep is an oceanic trench located to the northeast of Greenland, and approx. 350 kilometers north of Svalbard, in the Eurasian Basin in the Arctic Ocean. The Litke Deep holds the distinction of being the deepest known point in the Arctic Ocean at 5,449 metres (17,881 feet).[1] It is the 20th deepest oceanic trench in the world.
The piece doesn’t state whether that place on Earth is closest to the centre of the Earth.
No offence intended but it’s an incomplete answer.
That’s where I’d put my money. But if someone wants to do the necessary calculations for all other contenders, they should concentrate on the Arctic. Nothing in the tropics stands a chance.
Given a feature at latitude L, the distance from the center to the ellipsiod at that point in kilometers (IIRC) is E = 162177731.1568/(161634607.8736cos[sup]2[/sup]L + 162722679.4384sin[sup]2[/sup]L). This assumes the Earth is an ellipse if cut along a line of longitude with the polar radius the semi-minor axis and the equatorial radius the semi-major axis. Distance from the center of the Earth is E+a where a is the altitude above or below the ellipsoid.
Mean Seal level (MSL) follows the geoid and the distance of the feature from the center of the Earth is G+A where A is the altitude above or below the geoid and G is the distance of the geoid at that coordinate from the center of the Earth. The geoid only approximates the ellipsoid, is based on the barycenter of the Earth instead of the orthocenter and suffers from hills and valleys.
It’s pretty straightforward. The closest accessible place to the centre of the earth is likely going to be at one of the poles. Antarctica is a land mass, so attention turns to the northern pole, and the sea bed of the Arctic Ocean. Litke Deep is, as far as we know, the deepest part of the ocean up there.
It’s kind of like “What part of the world is furthest from the centre?” It’s not Everest, it’s the summit of Chimborazo, in Ecuador.
I’m sure (s)he gets that. The answer still is incomplete. The sounds like a good guess, but perhaps there’s a canyon that’s not quite as deep, but is further north that might pose a challenge.
I’m not sure where the attitude from several of the responders is coming from.
People were getting there, gradually. The math is a part of finding the answer. You’re an asshole. When they find that deepest part, I hope they throw you in there and dance afterward.