Asian Surveying & Mapping
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Singapore Geospatial Festival 2021
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ISRO Invites Applications from Students for Two-week Free Online Course on Remote Sensing and GIS Technology
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New satellite system could improve Australia’s water quality management
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China launches twin satellites capable of creating 3D maps in space
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Egyptian Space Agency says Egypt to launch 4 satellites in 2022
Chief Executive Officer of the Egyptian Space Agency Mohamed...
Government launches new portal to facilitate geospatial planning of MGNREGA assets
The portal will serve as a repository of assets...
BRICS members to share data from Earth remote sensing satellites
BRICS members to share data from Earth remote sensing...

December 26th, 2011
1st Direct Measurement of Earth’s Rotation

The Earth wobbles. Like a spinning top touched in mid-spin, its rotational axis fluctuates in relation to space. This is partly caused by gravitation from the sun and the moon. At the same time, the Earth’s rotational axis constantly changes relative to the Earth’s surface. On the one hand, this is caused by variation in atmospheric pressure, ocean loading and wind. These elements combine in an effect known as the Chandler wobble to create polar motion. Named after the scientist who discovered it, this phenomenon has a period of around 435 days. On the other hand, an event known as the “annual wobble” causes the rotational axis to move over a period of a year. This is due to the Earth’s elliptical orbit around the sun. These two effects cause the Earth’s axis to migrate irregularly along a circular path with a radius of up to six meters. Read More