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Definition
Greek Astronomy
Ancient Greek astronomy was the study of the universe to understand how it functioned and why apart from the established theistic model that claimed all things were ordered and maintained by the gods. Ancient Greek astronomers relied on observation...

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The Planet Uranus
This is an image of the planet Uranus taken by the spacecraft Voyager 2 in 1986. The Voyager project is managed for NASA by the Jet Propulsion Laboratory.

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Eratosthenes' Calculation of the Earth's Circumference
An illustration showing Greek scientist Eratosthenes' method for calculating the circumference of the Earth. By measuring the angle of a shadow in one location (Alexandria) and comparing at the same time with a second point (Syene) where...

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Sif - Norse Goddess of the Earth
An illustration portraying Sif, a goddess in the Norse pantheon. She was associated with earth but was married to Thor, the god of the sky and thunder. Sif is a relatively little known figure who appears mainly in the Poetic Edda from the...

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Earth's Solar System
Earth's solar system by NASA and Rawpixel.

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The Forerunners of the Inca. Tiwanaku City | History - Planet Doc Full Documentaries
▶ SUBSCRIBE! http://bit.ly/PlanetDoc Full Documentaries every Tuesday, Thursday and Saturday! ▶ Documentary "The Forerunners of the Inca" http://pdoc.es/ForeIncas We traveled to the Bolivian altiplano plateau for the first pre-Inca cultures...

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Maasai People | Tribes - Planet Doc Full Documentaries
The Maasai live in southern Kenya and Amboseli very near the border with Tanzania. The Maasai love and care for their livestock. Maasai women perform multiple tasks but they also have time to get pretty. With the creation of Amboseli National...

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Tiwanaku | History - Planet Doc Full Documentaries
We travel the immense Lake Titicaca in Bolivia, for its ancient civilizations. The legendary Tiahuanaco and the mysterious islands of the sun and the moon, where even today, its inhabitants invoke the gods Pachamama and Viracocha. Subscribe...

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The Coolest Stuff on the Planet- Chillin' in Chan Chan
Northern Peru's Chan Chan Archaeological Zone is a massive complex that was once the capital of the Chimu civilization. But who were the Chimu? Why'd they build such a big city? Find out in this episode as you take a virtual tour of Chan...

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How the #LandBack Movement Might Help Save the Planet
Indigenous communities across the globe are experts at managing and protecting land. Is it time the U.S. finally returned STOLEN parklands back to them? SUBSCRIBE so you never miss a video! https://bit.ly/3tNKzhV And follow us on Instagram...