<div>Dear Paul</div> <div> </div> <div>I experienced similar error concerning this longitude difference.</div> <div> </div> <div>In ESP-r, longitude difference means 'the difference measured from standard time meridian.'</div> <div> </div> <div>For example, in Seoul Korea, the longitude is approximately 126.5. But the Standard Time is based on Tokyo, Japan where the longitude is 135.</div> <div> </div> <div>Therefore, there is longitude difference 135-126.5=8.5W</div> <div> </div> <div>When the longitude difference is calculated to West direction from the Standard Time meridian, you can put (-) for displaying its western direction. (That's why in Seoul the longitude difference is -8.5, if the area is located in east from Tokyo the difference will be (+).)<br> <br>Because it only deals with difference value (not the longitude itself), the longitude difference should be b/w -15 and 15 degree.</div> <div> </div> <div>Since one full rotation (360 degrees) of the Earth takes 24 hours we see that 1 hour of time equates to 15 degrees of longitude (360 degrees of longitude/24 hours= 15 degrees of longitude).</div> <div> </div> <div>I hope this can be helpful to you.</div> <div> </div> <div> </div> <div>Lewis Yook </div> <div> <br>Team Manager,<br>Integrated Simulation Unit.<br>Design and Simulation for Sustainability (DASS) consultants Ltd.<br>  <br>143-834<br>Venture Center 304-ho<br>632-9 Guui-dong Gwangjin-gu, Seoul, Korea<br>T. 82.2.913.2585 F. 82.2.949.2585<br> H. <a href="http://www.dasskorea.com">www.dasskorea.com</a><br> </div> <div> </div> <div><span class="gmail_quote">2008/12/28, Leepaul <<a href="mailto:esprfans@hotmail.com">esprfans@hotmail.com</a>>:</span> <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"> <div>Dear all,<br> <br>I downloaded a weather file from ENERGY+ website, and transfered it as the binary file ESP-r needs. when I opened that binary weather file with ESP-r, and tried to output the "integration radiation" data, the esp-r reminded me"the longitude difference is more than +-15 degree", I noted that the site data of my downloaed file are: longitude -32.8, and somwhere is 32.8W. So  what does "longitude -32.8, or 32.8W" mean? and why computer tell me"the longitude difference is more than +-15 degree"? <br>  <br>thank you for your answer.<br> <br>kind regards,<br>Paul<br><br> <hr> MSN保护盾，十八般武艺保障MSN安全！ <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://im.live.cn/safe/" target="_blank">现在就下载！</a></div><br>_______________________________________________<br>esp-r mailing list<br><a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:esp-r@lists.strath.ac.uk">esp-r@lists.strath.ac.uk</a><br> <a onclick="return top.js.OpenExtLink(window,event,this)" href="http://lists.strath.ac.uk/mailman/listinfo/esp-r" target="_blank">http://lists.strath.ac.uk/mailman/listinfo/esp-r</a><br></blockquote></div><br><br clear="all"> <br><br>