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Hollywood Sign. / 34.1340611°N 118.3215917°W / 34.1340611; -118.3215917. The Hollywood Sign is an American landmark and cultural icon overlooking Hollywood, Los Angeles, California. Originally the Hollywoodland Sign, it is situated on Mount Lee, above Beachwood Canyon in the Santa Monica Mountains.
Aristarchus of Samos. Eratosthenes ( c. 276 – c. 194/195 BC ), a Greek mathematician who calculated the circumference of the Earth and also the distance from the Earth to the Sun. Hipparchus ( c. 190 – c. 120 BC ), a Greek mathematician who measured the radii of the Sun and the Moon as well as their distances from the Earth.
Apollo 13 (April 11–17, 1970) was the seventh crewed mission in the Apollo space program and the third meant to land on the Moon. The craft was launched from Kennedy Space Center on April 11, 1970, but the lunar landing was aborted after an oxygen tank in the service module (SM) ruptured two days into the mission, disabling its electrical and life-support system.
There should have been more than a two-second delay in communications between Earth and the Moon, at a distance of 250,000 mi (400,000 km). The round-trip light travel time of more than two seconds is apparent in all the real-time recordings of the lunar audio, but this does not always appear as expected.
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Lunar distance (LD or ), or Earth–Moon characteristic distance, is a unit of measure in astronomy. More technically, it is the semi-major axis of the geocentric lunar orbit . The lunar distance is on average approximately 385,000 km (239,000 mi), or 1.28 light-seconds ; this is roughly 30 times Earth's diameter or 9.5 times Earth's ...
The sign sits at 1,578 feet, just above the 1,500-foot line at which the National Weather Service expected to see snow during the storm bringing frigid temperatures to Southern California.
On Sizes and Distances (of the Sun and Moon) (Greek: Περὶ μεγεθῶν καὶ ἀποστημάτων [ἡλίου καὶ σελήνης], romanized: Peri megethon kai apostematon) is a text by the ancient Greek astronomer Hipparchus (c. 190 – c. 120 BC) in which approximations are made for the radii of the Sun and the Moon as well as their distances from the Earth.