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Claudio Monteverdi
Claudio Monteverdi

Claudio Monteverdi (1567–1643) composed ten operas, a genre that emerged while he was a court musician in Mantua. His first opera, L'Orfeo, premiered in 1607 and became the first opera still in today's repertoire. The music for seven of his opera projects is mostly lost. Four of these were completed and performed, while he abandoned the others at some point. Libretti have survived for some of them, as well as fragments of the music for L'Arianna and Proserpina rapita. Monteverdi composed operas for a theatre in Venice when he was master of music at San Marco, including Il ritorno d'Ulisse in patria in 1640 and L'incoronazione di Poppea in 1643, both of which also remain in the repertoire. (Full list...)

Part of the Operas by Claudio Monteverdi series, one of Wikipedia's featured topics.

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Geostationary orbit

This is an animation showing geocentric satellite orbits, to scale with the Earth, at 3,600 times actual speed. The second-outermost (shown in grey) is a geostationary orbit, 35,786 kilometres (22,236 miles) above Earth's equator and following the direction of Earth's rotation, with an orbital period matching the planet's rotation period (a geosynchronous orbit). An object in such an orbit will appear to occupy a fixed position in the sky. Some 300 kilometres (190 miles) farther away is the graveyard orbit (brown), used for satellites at the end of their operational lives. Nearer to the Earth are the orbits of navigational satellites, such as Galileo (turquoise), BeiDou (beige), GPS (blue) and GLONASS (red), in medium Earth orbits. Much closer to the planet, and within the inner Van Allen belt, are satellites in low Earth orbit, such as the Iridium satellite constellation (purple), the Hubble Space Telescope (green) and the International Space Station (magenta).

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