Since 1970 April 22 is known as International Earth Day designed to inspire awareness and appreciation for the Earth’s environment and popularize knowledge about our Planet.

Founded by the organizers of the first April 22 EarthDay in 1970, Earth Day Network promotes environmental citizenship and year round progressive action worldwide. Earth Day Network is a driving force steering environmental awareness around the world. Through Earth Day Network, activists connect change in local, national, and global policies. Earth Day Network’s international network reaches over 17,000 organizations in 174 countries, while the domestic program engages 5,000 groups and over 25,000 educators coordinating millions of community development and environmental protection activities throughout the year. Earth Day is the only event celebrated simultaneously around the globe by people of all backgrounds, faiths and nationalities. More than a half billion people participate in Earth Day Network campaigns every year. [wikipedia.com]

To celebrate EarthDay 2009, we have added some ‘Earth Facts’ in the table below.
If you are not familiar with the units given in the table or you just want to get other units, click on the value to get to the unit converter.

Dictionary (Definition):
Aphelion the point in its orbit where a planet (Earth) is farthest from the Sun (opposite of perihelion)
Perihelion the point in its orbit where a planet (Earth) is closest to the Sun (opposite of aphelion)
Equatorial Radius radius measured from the center of the Earth to the point on the Equator.
Polar Radius radius measured from the center of the Earth to the polar.
Circumference equatorial Earth circumference measured along the Equator.
Circumference meridional Earth circumference measured through the poles.
Sidereal rotation period Average Earth day.
Orbital Period Of the Earth The amount of time it takes the Earth to travel once around its orbit.

Happy Earth Day!