Eccentricity. Obliquity. Precession. The Earth’s climate is influenced by both natural long-term cycles and recent human activities. The Milankovitch cycles refer to the long-term variations in the ...

Throughout Earth’s long and dynamic history, the climate has shifted dramatically. Ice ages have come and gone, shaping the planet and leaving scientists and historians alike wondering about their ...

At the International Earth Rotation and Reference Systems Service in Paris, a quiet calculation takes place several times a year. Technicians compare the world’s atomic clocks, which measure time with ...