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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#168821'>Alan Rahill of Environment Canada has one that is used in the Clear Sky Charts. I don’t know the derivation. Wouldn’t surprise me if it was based on TKE (Turbulent Kinetic Energy). <o:p></o:p></span></p><p class=MsoNormal><span style='color:#168821'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#168821'>Regards,<o:p></o:p></span></p><div><p class=MsoNormal><span lang=FR-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#168821;mso-fareast-language:EN-CA'>Alister Ling</span><span lang=FR-CA style='color:#168821;mso-fareast-language:EN-CA'> <o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#168821'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:EN-CA'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";mso-fareast-language:EN-CA'> gradsusr-bounces@gradsusr.org [mailto:gradsusr-bounces@gradsusr.org] <b>On Behalf Of </b>Mike Manning<br><b>Sent:</b> April 20, 2015 10:58 PM<br><b>To:</b> gradsusr@gradsusr.org<br><b>Subject:</b> [gradsusr] Calculating Seeing Index<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-AU>Hi everyone,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-AU>Does anyone have a gradscript for calculating the astronomical seeing index? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-AU><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-AU>Cheers, Mike<o:p></o:p></span></p></div></body></html>