posted on Jun, 6 2012 @ 11:16 AM
Originally posted by LittleBlackEagle
the site you mentioned is back up and i have to say i viewed the footage with much surprise. indeed it looks like Venus went across the sun in more of
a straight line.
The apparent path of Venus across the sun depends on a variety of factors pertaining to the equipment used, all of which is far above Nancy's level of
understanding. For instance, the stream I watched was from a fellow amateur in Tacoma. He was using a Lundt solar scope mounted on an iOptron
minitower. That's an alt-az mount for small scopes, and as such it is subject to field rotation. The apparent path will therefore be influenced by
field rotation in a way that is completely dependent on the observer's location. One of the most popular applets people used to figure out the path
of Venus showed its path from an altitude-azimuth perspective based on their location - if you alter your location manually in the applet, it
completely changes the path.
From a polar aligned perspective, and only from a polar aligned perspective, the path of Venus WAS a straight line. However, most scopes that were
streaming were not polar aligned, for the most part they were small solar scopes on altitude-azimuth mountings. Even the polar aligned scopes would
show disagreement with the applet, however, as the applet assumed you were viewing from an altitude-azimuth perspective.
There's also the issue of camera orientation as well; you can freely rotate cameras within the draw tube of a telescope, so they can be oriented any
which way. A permanent privately owned observatory I helped set up has two solar scopes that are polar aligned, but their cameras are rotated 90
degrees so that they can be secured on a cross bar that runs between the two scopes which are mounted side by side on the same polar mount.
In short, Nancy has no clue what she's talking about, she knows nothing about astronomy or astrophotography and she makes false assumptions from her
edit on 6-6-2012 by ngchunter because: (no reason given)