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Chris L Peterson wrote: > Sorry, I meant 5 arcminute- just confused myself using "arcsecond" > earlier in the same sentence <g>. Field rotation will be negligible > for typical exposure times if the polar alignment error is only 5 > arcminutes (Andrea used the symbol, and it is her assertion I am > disagreeing with). You're right--Andrea used the symbol. I thought he had just copied it from you, but in looking over your post, you did write it out. What do you consider a typical exposure time? I guess the amount of field rotation also depends on how far the target is from the pole. Brian Tung <[EMAIL PROTECTED]> The Astronomy Corner at http://astro.isi.edu/ Unofficial C5+ Home Page at http://astro.isi.edu/c5plus/ The PleiadAtlas Home Page at http://astro.isi.edu/pleiadatlas/ My Own Personal FAQ (SAA) at http://astro.isi.edu/reference/faq.txt
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