Popular history is contingent upon the historian who writes it. Every event in history is seen through the eyes of those who witness it. Each perspective is unique.

Thursday, January 31, 2008

Alvin Clark discovers dwarf companion of Sirius


January 31, 1862 Telescope maker Alvin Clark discovers dwarf companion of Sirius.
The first white dwarf to be discovered was found because it is a companion star to Sirius, a bright star in the constellation Canis Major. In 1844, astronomer Friedrich Bessel noticed that Sirius had a slight back and forth motion, as if it was orbiting an unseen object. In 1863, the optician and telescope maker Alvan Clark spotted this mysterious object. This star was later determined to be a white dwarf. This pair are now referred to as Sirius A and B, B, being the white dwarf. The orbital period of this system is about 50 years.

Since white dwarfs are very small and thus very hard to detect, binary systems are a helpful way to locate them. As with the Sirius system, if a star seems to have some sort of unexplained motion, we may find that the single star is really a multiple system. Upon close inspection we may find that it has a white dwarf companion.

Friday, January 25, 2008

1-25-1915 The first long distance call by Bell


1915 Alexander Graham Bell began transcontinental phone service with a call to Dr. Watson in San Francisco.
This connected the world in a whole new way. No longer would people have to wait long intervals for news to reach across the world. The telegraph had previously connected cities through its intricate network of telegraph lines.
Until 1877, all rapid long-distance communication depended upon the telegraph. That year, the rival technology developed that would again change the face of communication -- the telephone. By 1879, patent litigation between Western Union and the infant telephone system was ended in an agreement that largely separated the two services.
For five years AT&T had wanted to link the phone lines from one side of the country to the other. They finally found the device that could help them do it: Lee De Forest's "audions," the first vacuum tubes. They placed them along the 3,400 miles of wires connecting one coast to the other. As a voice signal traveled along the wires it naturally weakened. Every time it hit an audion, the signal was boosted.

The first trial took place in July of 1914, when the president of the company, Theodore Vail, spoke from one coast to the other -- his voice boosted in Pittsburgh, Omaha, and Salt Lake City along the way.

But the big celebration didn't occur until January 25, 1915, at a meeting in San Francisco. Sitting in New York, Alexander Graham Bell said into the phone what he had once said decades before: "Mr. Watson, come here. I want you." But this time Watson, sitting in San Francisco, replied, "It will take me five days to get there now!"

With the world connected through phones, Internet, television and much more, we take our technology for granted. People today feel lost without the modern conveniences they have become accustomed to depend on. Imagine a world where fire light was the only way we could see in the dark. In this world, when you read about a newsworthy event it is already "old news". Communities welcomed travelers since they were the best way to get news from other places. Newspapers were not always reliable. Of course, the gossip network was only reliable as the person who contributed to it. Now we have blogs (like this one) where a whole new ' network of information is spread. Like the primitive "word of mouth" network of days gone by, blogs are only as reliable as the person who contributes to it. Of course, today, the reader is able to follow up with their own research and verification. Then again, if one person spreads something as truth and two people repeat it, then two more, and so on, people will start to believe it. It doesn't matter if it was by gossip or Internet. Sometimes they are the same thing.


Tuesday, January 8, 2008

Galileo died on this day


Galileo Galilei (1564-1642)
Galileo was one of the greatest astronomers in the world. He changed the way we think about the universe. Galileo was the first person to use a telescope to look at the universe. He studied the sun, the planets, and the moon.

Galileo was born in Pisa, Italy, on February 15, 1564. Did you know Galileo was born in the same year as William Shakespeare? It is also the same year in which Michelangelo died.

When Galileo was born, Italy was not called Italy. Instead, Italy was made up of independent city-states. The city-states were in regions controlled by powerful families. Pisa was located in the Tuscany region and controlled by the Medici family.

Galileo died on January 8, 1642, in Arcetri, near Florence, Italy. He was 77 years old. He is buried in the Santa Croce cemetery in Florence.

Galileo's observations of the planet Jupiter were very important. To honor his contributions, the four moons of Jupiter which Galileo discovered are called the Galilean Moons. These are Jupiter's largest moons.

There is also a spacecraft named after Galileo. It was launched on October 18, 1989, to orbit Jupiter. It went into orbit around Jupiter in 1995.

Galileo proved the earth revolved around the sun.

He was a great astronomer and scientist. Galileo spent the last years of his life under house arrest on orders of the Inquisition. Today he is considered a pioneer in the science of astronomy.

Wednesday, January 2, 2008

Isaac Asimov was born on this day in 1920




Isaac Asimov (January 2, 1920– April 6, 1992
Asimov is widely considered a master of the science-fiction genre.
Isaac Asimov was born in Petrovichi, Russia, as the son of Judah Asimov and Anna Rachel Berman Asimov. Asimov could read before he entered the first grade. He also had "a near-photographic memory." At school Asimov finished books in a few days. His father got him a library card, but did not supervise the books his son read. A classic "bookworm", Asimov devoured early works on Greek mythology, the Iliad, William Shakespeare plays, history books, all kinds of miscellaneous reading. One library was not enough - he used to go to every one within reach. After leaving Boys High School in Brooklyn, an elite school in those days, Asimov studied chemistry at Columbia University, New York, where he graduated in 1939 and received his M.A. in 1941.
Asimov had published works from 1941 to 1995 (posthumously).
Also on this date, the construction of the Brooklyn bridge commenced in 1870.