“What a marvelous cooperative arrangement—plants and animals each inhaling each other’s exhalations, a kind of planet-wide mutual mouth-to-stoma resuscitation, the entire elegant cycle powered by a star 150 million kilometers away.”
Andreas Cellarius - Antique Atlas of the Geocentric Ptolemaic Cosmos, “Harmonia Macrocosmica”, 1660.
Orbiting a large central Earth, the Planets are depicted as Star-like shapes, each identified with its traditional Symbol. The Zodiac, divided into twelve thirty-degree divisions of Celestial longitude, defines the apparent path of the Sun through the Constellations as seen from Earth. The axis of the Universe is defined by the Terrestrial poles, and the Earth’s equator is projected outward, creating a Celestial equator as well. Ptolemy himself might be represented by one of the figures on the lower right, in a crumbling Alexandria, possibly also symbolic of the decline of his Cosmological design, following the revolutionary findings of Copernicus.
Sentinel-2A conducted its first ever scan of Earth on June 27th. The result was this gorgeous image of the Sahara in central Algeria, showing a glorious terrain of rocks and sand.
Sentinel-2 is the second of six planned Sentinel missions. A pair of satellites with multispectral high-resolution imaging systems, Sentinel 2 will be used to track land use, vegetation stress, soil and water cover, or satellite imagery for emergency response. This Sahara photo is only one of the first photos picked up by the satellite, the rest being shots of Europe.