- Moon (silver)
- Mercury (turquoise)
- Venus (lapis lazuli)
- Sun (gold)
- Mars (red onyx)
- Jupiter (white crystal)
- Saturn (obsidian).
Friday, January 25, 2013
APOD 3.2: The Antikythera Mechanism
I liked this particular "astronomy picture of the day" because of its incredible historical connection. the "Antikythera Mechanism" was found in an ancient Greek ship at the bottom of the sea, which most likely sank around 80 BC. Such a gear was not thought to have been created for another 1,000 years later- it was a sort of mechanical computer. The wheels and gears create a sort of orrery of the sky; although some of its functions are unknown, one use was probably to predict events such as eclipses. It is about the size of a large book.
Friday, January 18, 2013
APOD 3.1- Stickney Crater
The surreal-looking, enhanced-color picture, belonging to NASA, displays Stickney Crater, which is the largest crater on the martian moon Phobos. It was taken by the WiRISE camera aboard the Mars Reconnaissance Orbiter in 2008. The crater was named for the wife of the astronomer Asaph Hall, who was responsible for discovering both of Mars' moons.
Stickney Crater is half the diameter of Phobos; whatever created it likely could have destroyed the moon in fact. The streaks are probably from loose material sliding down the walls of the geological feature (although Phobos' gravity is less than 1/1000th Earth's gravity), and the bluish regions denote exposed surfaces. There are many groves in Stickney Crater, created during the impact that produced the feature.
Stickney Crater is half the diameter of Phobos; whatever created it likely could have destroyed the moon in fact. The streaks are probably from loose material sliding down the walls of the geological feature (although Phobos' gravity is less than 1/1000th Earth's gravity), and the bluish regions denote exposed surfaces. There are many groves in Stickney Crater, created during the impact that produced the feature.
Sunday, January 13, 2013
APOD 2.8: "Jellyfish Nebula"
This usually faint, elusive nebula, which looks much more like a brain than a jellyfish to me, is part of a supernova remnant known as IC 443. It forms a debris cloud, from an enormous star that exploded. Light from the explosion reached Earth 30,000 years ago- although I should like to review how astronomers find this out. This nebula is located near a bright star called Eta Geminorum, in the constellation Gemini. It is about 5,000 light years away, and it is a "complex environment."
Tuesday, January 8, 2013
Nathaniel Bowditch Biography
Letts 1
Olivia
Letts
Mr.
Percival
Astronomy,
Per. 3
10 Jan.
2013
Nathaniel Bowditch- Navigator and Mathematician
In
1773, the year of the Boston Tea Party, Nathaniel Bowditch was born in Salem,
Massachusetts. Because his father,
Habakkuk, was a shipmaster, he grew up exposed to the idiosyncrasies of
seafaring ways in a community where daring mariners were esteemed and blows
were delivered against British shipping during the time of the American
Revolution. It was Bowditch’s
family’s brief stay in Danvers that shielded him from the dangers of the
political and military turmoil that was occurring. As a child he tried to fill every moment he could learning
mathematics; although the school system at that time was poor, there he
excelled. His father was nearly
always absent on voyages, and while Bowditch was adored by his mother for his
promising future, the family was most often hungry and in a state of
near-poverty. Thus, Habakkuk
Bowditch pulled his son out of school, and young Nathaniel became an apprentice
clerk at a ship chandler’s shop.
However, he taught himself calculus, and also Latin and French, which
allowed him to both read and translate many influential works. He carried on with his studies all
through 1795-1806, during which he undertook many sea voyages aboard merchant
ships. As his mathematical, observational, and scientific skills were sharpened
he also became a rising businessman and after his final voyage he became
president of a prosperous fire and marine insurance company in Salem.
While president, the mathematical and scientific research
he undertook earned him great respect.
His first wife died in 1798 after only seven months of marriage,
plunging him into a depression. He
was married again two years later to Mary Ingersoll, with whom he would have
Letts 2
many
children. The many honors he
attained for his work also lent him comfort; he was elected to the American
Academy of Arts and Sciences in 1799.
After his New American Practical Navigator was published in 1802, Harvard awarded him a Master of
Arts Degree. He became known as the
father of modern maritime navigation because of this detailed instructional
work, which also improved upon John Moore’s faulty yet influential Practical
Navigator. Harvard would later offer him a chair of mathematics and
physics, which he refused along with the U.S. Military Academy and the
University of Virginia, though he would also go on to be elected to the
American Philosophical Society, the Royal Irish Academy, and the Royal Society
of Edinburgh, and the Royal Society of London. Aside from naval charts, Bowditch wrote many astronomical
articles based on his observations.
In 1806 he published a well-read article on the motion of the moon. Using a magnetic needle in some
interesting experiments, he illustrated and bolstered concepts of revolution,
the Earth’s oblateness (slightly flattened at the poles), and he also corrected
parts of the celestial table including meridians and latitudes. Bowditch wrote publications on meteor
showers, and the orbits of three comets, and reportedly demonstrated how to
find the place of a meteor. He
added touches to many famous works, including Newton’s.
Lissajous
curves (part of complex parametric equation systems) became known as Bowditch
curves due to the man’s groundbreaking mathematical studies on them conducted
through the observation of the motion of a pendulum suspended on two
points. Bowditch also translated
Pierre-Simon de Laplace’s Mécanique céleste in 1818, to
which he added commentary. He
could not afford to have the various volumes published until 1829, 1832, 1834,
and 1839, but these translations became vital to the development of theoretical
astronomy and mathematics in the United States. He did not form any great
theories but instead is admirable for his painstaking mathematical work and
tireless observations. He died in
1838 from stomach cancer, and is said to have thousands of descendents in the
United States.
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