Re: Shadow Velocity Calculation?

[Wuwalton]

      I see I jumped to my own conclusions, and made some wrong assumptions as to why you wanted to know the velocity of the shadow on the Kitt Peak Dial.  I think the speeds would be impressive, especially early or late in the day.  

      However, you might find estimates of the shadow's speed, near different hours lines, of help in knowing how quickly you must work in marking those lines experimentally. With that in mind I would like to make some corrections to my previous note of 5/26/02.

      The end of the first paragraph should read. "and it might be more convenient to divide 3600 seconds by the distance traveled in centimeters to get a figure for the time it takes the shadow to move one centimeter."  Use whatever unit of distance you like.  I used centimeters because you used meters in your question, and a meter might be a large distance for the shadow to move in one-second over a large portion of the dial.

      There is at least one other typographical error in the message, but the context makes it clear, I think, that I meant an "In" where I wrote an "I."

      Happy dialing,             

     Bill Walton
     Plymouth,  MA, USA
     42 N   71 W