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Thursday, April 03, 2014

Beyond that


Civilization has come a long way.  Ancient humans knew quite a bit about their immediate environment.  But, when they looked to the heavens, it was an amazement to them.  They really didn't know what was out there or how to put in perspective what they saw.  The Mayans, and the Babylonians before them, were very well versed in the movement of planets and the various constellations, but beyond tracking movement, they didn't know much.  The makers of Stone Henge and some of the other stone monuments around the world knew about length of days and associated that to the time of year, especially the two solstices.  But, they didn't really know how to view the heavens.

Compare that to modern knowledge and perspective.  There are 8 planets, an asteroid belt, moons revolving around most planets, a Kuiper Belt containing icy planetisimals, such as Pluto, and an Oort Cloud, which has two parts, an inner disc around the Kuiper Belt and an outer circle that defines the cosmograph of the solar system.  From the sun to the outer limits of the Oort Cloud is about 1 light year.


If I travel beyond the Oort cloud another 5 light years, I come to Alpha Centauri the nearest star to Earth's sun.  Astronomers have found another 4 stars in the Alpha Centauri field since originally finding and identifying Alpha Centauri.  Those other four stars have planets revolving around them.  Of course, there are many more solar (stellar) systems in the Milky Way Galaxy, between 100 and 200 billion of them, all of them in the 100,000 light year diameter of the galaxy.

Beyond that are billions and billions of more galaxies, with diameters up to 25 times that of the Milky Way.  All of them contain billions and billions of stars, many of them with planets, which have moons.


So, when I read documents from the ancient past, I know to read them with the perspective they had of the heavens, which was very, very, very, very limited.  We still have much to learn about our skies, but we know infinitely more than the documents coming from generations before the 1600s C.E.  Ancient documents were intended for people with the same understanding as they themselves, not for people of the future who know infinitely more.  If I understand that, then ancient documents don't impede future progress or hold me back from doing what is right for me in a modern period of civilization.

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