New Kilogram, Volt and Ohm are ready for SI-2018

[brucehoult]

Aha! The Earth itself is in free-fall with respect to the Moon and Sun, so doesn't feel anything. Someone in a place with the Sun overhead or underfoot is not quite in free-fall -- they are constrained to the same path as the Earth (by being pressed on the surface of the Earth), even though they have slightly higher or slightly lower acceleration towards the Sun than the rigid body of the Earth does.

Thanks.