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If you’re looking forward to spring, you’re not alone. But it’s not just Easter and Mother’s Day that you might want to pencil in on your calendar—Earth Day falls on April 22 this year ...
3. Ride before you drive. Wherever you need to go on Earth Day, from point A to point B, make it a priority to leave a little earlier and trade your tires for some wheels.
Earth's rotation axis moves with respect to the fixed stars (inertial space); the components of this motion are precession and nutation. It also moves with respect to Earth's crust; this is called polar motion. Precession is a rotation of Earth's rotation axis, caused primarily by external torques from the gravity of the Sun, Moon and other bodies.
A rich collection of exciting and imaginative activities [9] covering a wide range of Earth-related topics can be found on the website. Each week an activity is posted on the ELI blog. New activities are published here and comments and suggestions are encouraged. The suggestions are incorporated into ´Extension´ ideas for the activities.
The pendulum was introduced in 1851 and was the first experiment to give simple, direct evidence of the Earth's rotation. Foucault followed up in 1852 with a gyroscope experiment to further demonstrate the Earth's rotation. Foucault pendulums today are popular displays in science museums and universities. [1]
The Chandler wobble or Chandler variation of latitude is a small deviation in the Earth's axis of rotation relative to the solid earth, [1] which was discovered by and named after American astronomer Seth Carlo Chandler in 1891. It amounts to change of about 9 metres (30 ft) in the point at which the axis intersects the Earth's surface and has ...
Obliquity of the ecliptic is the term used by astronomers for the inclination of Earth's equator with respect to the ecliptic, or of Earth's rotation axis to a perpendicular to the ecliptic. It is about 23.4° and is currently decreasing 0.013 degrees (47 arcseconds) per hundred years because of planetary perturbations.
Earth's Birthday Project still puts butterflies into the hands of children, through programs in schools and individually to families. [9] [10] The organization also promotes the teaching of environmental issues as part of school science curriculum. Earth's Birthday Project rebranded as Celebrate Planet Earth in 2019. [11]