The Viking Explorer Who Beat Columbus to America. Leif Eriksson Day commemorates the Norse explorer believed to have led the first European expedition to North America.
Orbital effects on climate. There are various solar/celestial effects that exist which have an effect on Earth's climate. These effects usually occur in cycles, and primarily include how Earth's obliquity, the eccentricity of Earth's orbit, and the precession of the equinoxes and solstices affect Earth's climate.
The moon takes about 27 days and 7 hours to revolve around the Earth.
Ötzi's discovery was a stroke of luck for the study of prehistory. Ötzi, together with Stonehenge and the Egyptian pyramids, has become a universally recognized time marker. Ötzi has the oldest known tattoos in the world. They were made for medical reasons to ease pain, not for decorative purposes.
