Comments on: Myths disproved http://ddhr.org/2006/01/10/myths-disproved/ The personal web presence of David Hosier Wed, 04 Jan 2012 20:12:12 +0000 hourly 1 By: Dave http://ddhr.org/2006/01/10/myths-disproved/#comment-122 Dave Thu, 12 Jan 2006 03:48:19 +0000 http://ddhr.org/2006/01/10/myths-disproved/#comment-122 Rich:  Thanks for the physics lesson.  It sounds like you know what you're talking about.  Guest:  <a href="http://www.space.com/scienceastronomy/visible_from_space_031006.html">Space.com</a> says astronauts can see many things from space, including highways, airports, dams, cities, and the Egyptian Pyramids.  Astronauts in <a href="http://en.wikipedia.org/wiki/Low_Earth_orbit">low Earth orbit</a> are about 135 miles from the surface of the earth, and they're traveling at about 17,000 mph. Rich:  Thanks for the physics lesson.  It sounds like you know what you're talking about. 

Guest:  Space.com says astronauts can see many things from space, including highways, airports, dams, cities, and the Egyptian Pyramids.  Astronauts in low Earth orbit are about 135 miles from the surface of the earth, and they're traveling at about 17,000 mph.

]]> By: GUEST http://ddhr.org/2006/01/10/myths-disproved/#comment-121 GUEST Wed, 11 Jan 2006 16:56:05 +0000 http://ddhr.org/2006/01/10/myths-disproved/#comment-121 I guess that would be a matter of perspective.  How far in space are you from the Earth?  According to your post; what other man made structures can been seen from space? I guess that would be a matter of perspective.  How far in space are you from the Earth?  According to your post; what other man made structures can been seen from space?

]]> By: Rich http://ddhr.org/2006/01/10/myths-disproved/#comment-120 Rich Wed, 11 Jan 2006 08:39:01 +0000 http://ddhr.org/2006/01/10/myths-disproved/#comment-120 About #2.  If you assume a perfect hemisphere with a circular hole at the bottom, and no initial perturbation (don't stir it ), the coriolis effect will manifest itself, and the water will form a whirlpool in the opposite direction depending on whether you are in the northern or southern hemisphere.  How about on the equator, you may ask?  In theory it might flow straight out, but in practice, there would be some imperfection in the bowl or hole, or some slight perturbation as the water begins to drain, and that would give it a rotation.  You are correct, though, since we aren't dealing with a perfect hemisphere at all, and the water is definately given an initial rotation. About #2.  If you assume a perfect hemisphere with a circular hole at the bottom, and no initial perturbation (don't stir it ), the coriolis effect will manifest itself, and the water will form a whirlpool in the opposite direction depending on whether you are in the northern or southern hemisphere.  How about on the equator, you may ask?  In theory it might flow straight out, but in practice, there would be some imperfection in the bowl or hole, or some slight perturbation as the water begins to drain, and that would give it a rotation.  You are correct, though, since we aren't dealing with a perfect hemisphere at all, and the water is definately given an initial rotation.

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