Iapetus was discovered by Giovanni Domenico Cassini, an Italian–French astronomer, in October 1671. He had discovered the moon on the western side of Saturn and tried viewing it on the eastern side some months later, but was unsuccessful. The pattern continued the following year as he was able to observe it on the western side, but not the eastern side. Cassini finally observed Iapetus on the eastern side in 1705 with the help of an improved telescope, finding it two magnitudes dimmer on that side.
Cassini correctly surmised that Iapetus has a bright hemisphere and a dark hemisphere, and that it is tidally locked, always keeping the same face towards Saturn. This means that the bright hemisphere is visible from Earth when Iapetus is on the western side of Saturn, and that the dark hemisphere is visible when Iapetus is on the eastern side. The dark hemisphere was later named Cassini Regio in his honour.
Read more about this topic: Iapetus (moon)
Other articles related to "discovery":
... Discovery Channel, an American TV channel distributed by Discovery Communications Discovery (Irish TV series), the first documentary television series to be ...
... Discovery Commerce operates a catalog and electronic commerce business offering lifestyle, health, science and education-oriented products, as well as products specifically ... serves as a licensing business that licenses Discovery trademarks and intellectual property to third parties for the purpose of creating and selling retail merchandise ... The Discovery shopping website offers products similar to those previously sold in the Discovery Channel retail stores ...
... Discovery Communications, Inc ... The company started as a single channel in 1985, The Discovery Channel ... DCI's 28 network entertainment brands, including Discovery Channel, Military Channel, TLC, Animal Planet, Discovery Fit Health and a family of digital channels ...
... The channel launched nationwide in the United States on June 1, 2002, as Discovery HD Theater ... The channel was rebranded to HD Theater on September 22, 2007, because Discovery Communications launched HD simulcasts of some of its other channels ...
... DCI operates its businesses in four groups Discovery Networks U.S ... Discovery Networks International, Discovery Commerce, and Discovery Education ...
Famous quotes containing the word discovery:
“As the mother of a son, I do not accept that alienation from me is necessary for his discovery of himself. As a woman, I will not cooperate in demeaning womanly things so that he can be proud to be a man. I like to think the women in my sons future are counting on me.”
—Letty Cottin Pogrebin (20th century)
“However backwards the world has been in former ages in the discovery of such points as GOD never meant us to know,we have been more successful in our own days:Mthousands can trace out now the impressions of this divine intercourse in themselves, from the first moment they received it, and with such distinct intelligence of its progress and workings, as to require no evidence of its truth.”
—Laurence Sterne (17131768)
“The gain is not the having of children; it is the discovery of love and how to be loving.”
—Polly Berrien Berends (20th century)