Flight plan: the geodesic arcs – one northerly, one southerly – show the shortest routes between Singapore and Quito. They are shorter than the line of the equator between the two points as Earth is not a perfect sphere

Geodesy is the study of Earth’s shape and size, and of variations in its gravitational field. Earth was originally believed to be flat, but many clues(...)

Oranges and lemons: variations of gravity have important geophysical consequences – but when it comes to weight control, they can’t substitute for the old reliables

Many of us struggle to lose weight, or at least struggle to keep our weight within a manageable range. There is no easy way to do this, but could g(...)