This practice was in small part responsible for the subsequent adoption of Greenwich Mean Time as an international standard . ( Time balls became redundant around 1920 with the introduction of lunar or solar observations.
42.
In 1868, Pierre Janssen's solar observations had led him to report to the Acad�mie des Sciences that " It is no longer geometry and mechanics which dominate [ in astronomy ] but physics and chemistry ."
43.
Scientists for the Spartan 201 solar observation satellite were jubilant about the data it collected from two telescopes that captured hundreds of images of the sun's glowing corona during its two-day mission free of the shuttle.
44.
Life-size structural models abound, both inside _ where a huge Soho solar observation satellite hangs in midair _ and in the grounds outside, you can walk through part of the Mir orbital station built by the Russians.
45.
A major event planned for Tuesday is the recovery of the Spartan solar observation spacecraft, which was released from the Discovery on Sunday for two days of studies centering on the Sun's hot, outermost layer, the corona.
46.
As solar observation explains, the Fabricii used a combination of telescope and camera obscura, and there were conflicting claims of priority in discovery because, as soon as the telescope came into astronomical use, multiple observers saw the sunspots.
47.
The scientific studies were carried out in the beginning with a radio telescope produced by the Dutch PTT, a 5 cm astrograph, a 15 cm Zeiss from Germany for solar observations, a Hilger and Watts microphotometer and a Cuffey Iris photometer.
48.
While his new observatory was in course of construction, he devoted some of his spare time to examining the drawings and records of sun-spots in possession of the Astronomical Society, and was much struck with the need and scarcity of systematic solar observations.
49.
Solar observation discusses the history of the process, but it doesn't explain the mechanics; exceptions such as eclipses can be done with the naked eye ( especially since the ancients maybe didn't know that it was still dangerous ), but sunspots are radically different.
50.
Construction of the solar observation site started in 1959 . The first instrument on the site was a new solar telescope, similar to Covington's original instrument, but slightly enlarged to 6 ft ( 1.8 m ) which allowed it to better observe the entire solar disk.
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