Earth is a small planet of the solar system but the conditions for the existence of life are most favorable on it.
Earth revolves around the sun in an ellipsoidal orbit measuring 2414 million km in length and completes one rotation in 365-1/4 days, but its period of rotation about its axis is 24 hours. Its polar diameter is 12,713 km and equatorial diameter measures l2,756 km. Its atmosphere consists of about 20% oxygen and 80% nitrogen. It has a satellite called Moon at a distance of 357,269 km and revolves around it.
Earth orbits around Sun at about 30 km/s (108,000 km/h), which is enough to cover one Earth diameter (~12,700 km) in 7 minutes, and one distance to the Moon (384,000 km) in 4 hours.
Earth turns around the Sun every 365 ¼ days (1 year). From Earth, this looks like an apparent movement of the Sun with respect to the stars at a rate of ca. 1 degree perday, i.e., a Sun or Moon diameter every 12 hours eastward.
The Earth is sometimes called the Third Rock from the Sun because it is the third closest planet to the sun.
Locals hypothesize that the legacy of Italian blood and culture in Cologne, colonized by the Romans more than 1500 years ago, makes the people more jovial and lighthearted. Cologne is the largest city on the Rhine.
Kolsch is not only the dialect spoken here but, also the name of their own top-fermented beer. There are more than 4,000 pubs, restaurant's and brewery taverns in Cologne.
Unlike many of the world's large cities, Cologne, with a population of over a million, gets better every day, there are more things to do and see, more new and innovative buildings... more
Travel is an opportunity to learn, whether geography, languages, history or other subjects.
Cologne is situated on the beautiful Rhine River.