Today in History
Apr 27, 2017 09:31:14 #
Happy Birthday, Universe! According to Johannes Kepler, (an astronomer and mathematician who is known for his [correct] theories that planets follow elliptical rather than circular orbits;) today in 4977 BC, the Universe was created. Strange that such a gifted mathematician, a contemporary and colleague of Tycho Brae, and Copernicus, could come up with something like that.
Apr 27, 2017 09:48:26 #
Loki wrote:
Happy Birthday, Universe! According to Johannes Kepler, (an astronomer and mathematician who is known for his [correct] theories that planets follow elliptical rather than circular orbits;) today in 4977 BC, the Universe was created. Strange that such a gifted mathematician, a contemporary and colleague of Tycho Brae, and Copernicus, could come up with something like that.
Very cool, Loki.. I didn't know this until just now..
I did know he was instrumental in the development of early telescopes....He invented the convex eyepiece, which allowed an expanded field vision as well....
Apr 27, 2017 09:56:59 #
lindajoy wrote:
Very cool, Loki.. I didn't know this until just now..
I did know he was instrumental in the development of early telescopes....He invented the convex eyepiece, which allowed an expanded field vision as well....
I did know he was instrumental in the development of early telescopes....He invented the convex eyepiece, which allowed an expanded field vision as well....
I thought that was Tycho Brae. I could be wrong. The two of them did work together for a time. I believe Brae was Keppler's boss.
Apr 27, 2017 10:09:02 #
Loki wrote:
Happy Birthday, Universe! According to Johannes Kepler, (an astronomer and mathematician who is known for his [correct] theories that planets follow elliptical rather than circular orbits;) today in 4977 BC, the Universe was created. Strange that such a gifted mathematician, a contemporary and colleague of Tycho Brae, and Copernicus, could come up with something like that.
From what I have read, Tycho Brahe was responsible for a huge data bank, of planetary observations, and Kepler used Brahe's work to calculate and plot the orbits of the planetary bodies.
Apr 27, 2017 13:35:43 #
Loki wrote:
I thought that was Tycho Brae. I could be wrong. The two of them did work together for a time. I believe Brae was Keppler's boss.
Ok since I wasn't sure I googled it..
The earliest known working telescopes appeared in 1608 in the Netherlands and are credited to Hans Lippershey. Among many others who claimed to have made the discovery were Zacharias Janssen, a spectacle-maker in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex objective lens and a concave eyepiece. Galileo used this design the following year. In 1611, Johannes Kepler described how a telescope could be made with a convex objective lens and a convex eyepiece lens and by 1655 astronomers such as Christiaan Huygens were building powerful but unwieldy Keplerian telescopes with compound eyepieces. Hans Lippershey is the earliest person documented to have applied for a patent for the device.[1]
Isaac Newton is credited with building the first "practical" reflector in 1668 with a design that incorporated a small flat diagonal mirror to reflect the light to an eyepiece mounted on the side of the telescope. Laurent Cassegrain in 1672 described the design of a reflector with a small convex secondary mirror to reflect light through a central hole in the main mirror.
Apr 27, 2017 13:40:31 #
BTW, I just read today is Ulysses S. Grant,
U.S. President, General (1822-1885) birthday too..
U.S. President, General (1822-1885) birthday too..
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