<html><body><div style="color:#000; background-color:#fff; font-family:garamond, new york, times, serif;font-size:24px"><div id="yui_3_16_0_1_1424080067804_44821"><span></span></div><div></div><div id="yui_3_16_0_1_1424080067804_44793"> Hi Davide, I learned the <gs id="2cf6fd4d-6445-4006-a135-4e8f2603b774" ginger_software_uiphraseguid="8f432158-ec73-433c-92ad-0f216981a252" class="GINGER_SOFTWARE_mark">script but</gs> the final part of the script is not clear to me </div><div dir="ltr" id="yiv9577197012yui_3_16_0_1_1424080067804_34754" class="" style=""><span class="" id="yui_3_16_0_1_1424080067804_43541" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"> Alpha='acos ( cos ( 'Phi1' ) *cos ( 'Phi2') +</span><br clear="none" class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><span class="" id="yui_3_16_0_1_1424080067804_43545" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><gs id="49617b36-1c1e-46b5-9451-ef492830702b" ginger_software_uiphraseguid="3a36f4f9-2ac4-4fe6-8fe5-875038b7ddb8" class="GINGER_SOFTWARE_mark">cos</gs> <gs id="3ce5fda0-8938-4551-a98d-b99e51a7b800" ginger_software_uiphraseguid="3a36f4f9-2ac4-4fe6-8fe5-875038b7ddb8" class="GINGER_SOFTWARE_mark">( </gs>'Theta1'-'Theta2'<gs id="425449a2-9a62-43ad-abff-67595a705b7a" ginger_software_uiphraseguid="3a36f4f9-2ac4-4fe6-8fe5-875038b7ddb8" class="GINGER_SOFTWARE_mark"> )</gs> *sin <gs id="f6d58bcc-0473-498d-aac2-40feeab216d4" ginger_software_uiphraseguid="3a36f4f9-2ac4-4fe6-8fe5-875038b7ddb8" class="GINGER_SOFTWARE_mark">( </gs>'Phi1'<gs id="a40816ed-84d4-43fd-9bfa-153a5aa21342" ginger_software_uiphraseguid="3a36f4f9-2ac4-4fe6-8fe5-875038b7ddb8" class="GINGER_SOFTWARE_mark"> )</gs> *sin <gs id="860ec21b-cfb8-4b90-bf64-12359683f6d1" ginger_software_uiphraseguid="3a36f4f9-2ac4-4fe6-8fe5-875038b7ddb8" class="GINGER_SOFTWARE_mark">( </gs>'Phi2'))'</span><br clear="none" class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><span class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" id="yui_3_16_0_1_1424080067804_44820">* 'd asin ( sqrt ( 'd2'))'</span><br clear="none" class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><span class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" id="yui_3_16_0_1_1424080067804_44819">* 'd <gs id="f8d0b9f4-1f37-4b5e-9d64-13c0457b19d2" ginger_software_uiphraseguid="f4efb535-fc1a-4b31-9c0f-ef1f69966191" class="GINGER_SOFTWARE_mark">acos</gs> <gs id="40a22ba3-9484-4fd9-9a6f-008318be8f25" ginger_software_uiphraseguid="f4efb535-fc1a-4b31-9c0f-ef1f69966191" class="GINGER_SOFTWARE_mark">( </gs>'Alpha')'</span><br clear="none" class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><span class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"> ' <gs id="8da034b6-602e-411a-9b4d-e5a1ad834231" ginger_software_uiphraseguid="59c56929-db4e-4a41-93a9-905d0582f72b" class="GINGER_SOFTWARE_mark">d</gs> 'Alpha</span><br clear="none" class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><span class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;">*say 'T<gs id="38d0c026-8e3a-4085-b7fb-e375253ec9bc" ginger_software_uiphraseguid="1f01a71f-3859-4926-8d30-7d2914b1756d" class="GINGER_SOFTWARE_mark"> ,</gs> P: 'Theta1' 'Phi1</span><br clear="none" class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><span class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;">*say 'T<gs id="da6374c7-c459-4f59-8827-59ad5edd958b" ginger_software_uiphraseguid="c518dad6-3a99-447b-bf6f-5e9b1572ba90" class="GINGER_SOFTWARE_mark"> ,</gs> P: 'Theta2' 'Phi2</span><br clear="none" class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><span class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" id="yui_3_16_0_1_1424080067804_44862">*say 'A<gs id="9e82d5e9-69c3-4f69-96fe-6e184950e31d" ginger_software_uiphraseguid="080d2c1e-5bae-403d-af42-fcce8f728df3" class="GINGER_SOFTWARE_mark"> ,</gs> <gs id="7a243df2-ef99-4e77-9d1f-b29c0d3e0111" ginger_software_uiphraseguid="080d2c1e-5bae-403d-af42-fcce8f728df3" class="GINGER_SOFTWARE_mark">cA</gs><gs id="dd66b1d2-624c-43f5-871b-ea9c4590ed3c" ginger_software_uiphraseguid="080d2c1e-5bae-403d-af42-fcce8f728df3" class="GINGER_SOFTWARE_mark"> :</gs> 'Alpha' 'subwrd <gs id="9f49f66f-5f84-4537-ad36-a8f5088d8b64" ginger_software_uiphraseguid="080d2c1e-5bae-403d-af42-fcce8f728df3" class="GINGER_SOFTWARE_mark">( </gs>result<gs id="282bffc2-ee8b-4872-b92a-0966388e41c3" ginger_software_uiphraseguid="080d2c1e-5bae-403d-af42-fcce8f728df3" class="GINGER_SOFTWARE_mark"> ,</gs> 4)</span><br clear="none" class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;"><span class="" style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" id="yui_3_16_0_1_1424080067804_44863"> <gs id="fe13450e-bf3d-4159-87ba-029fe43a464f" ginger_software_uiphraseguid="4160fecf-6de6-43d3-aa53-3c8a4917707d" class="GINGER_SOFTWARE_mark">return</gs> (subwrd <gs id="b08c3373-b93c-427c-b84b-034b982d0894" ginger_software_uiphraseguid="4160fecf-6de6-43d3-aa53-3c8a4917707d" class="GINGER_SOFTWARE_mark">( </gs>result<gs id="01b56e85-0925-418a-a91b-6e4acd4c7bbf" ginger_software_uiphraseguid="4160fecf-6de6-43d3-aa53-3c8a4917707d" class="GINGER_SOFTWARE_mark"> ,</gs> 4<gs id="2b9b9b80-ba97-4813-a590-fe301e5ec705" ginger_software_uiphraseguid="4160fecf-6de6-43d3-aa53-3c8a4917707d" class="GINGER_SOFTWARE_mark"> )</gs> *_At) </span><br clear="none" class="" style=""></div><div class="" style=""></div><div dir="ltr" id="yiv9577197012yui_3_16_0_1_1424080067804_34755" class="" style=""> <gs id="cbd2e25f-0766-4520-9c5e-baa9bba3fd55" ginger_software_uiphraseguid="b2537d29-ac97-49e4-a6ff-4cd8581072b2" class="GINGER_SOFTWARE_mark">what</gs> is a distance then. <gs id="b627cc54-5d66-4386-8e61-a4235ac61b73" ginger_software_uiphraseguid="6b0ff574-05cb-41e2-b9b2-96d7b88eeecb" class="GINGER_SOFTWARE_mark">is</gs> it * d2=x*x+y*y+z*z?</div><div class="" style="" id="yui_3_16_0_1_1424080067804_44834"><br class="" style=""></div><div id="yui_3_16_0_1_1424080067804_44792"><div id="yui_3_16_0_1_1424080067804_44791">AS EVER
<br>LUHUNGA
<br>
<br>--------------------
<br>Philbert Modest Luhunga
<br>University of Pretoria
<br>Department of Geography,Geoinformatics and Meteorology
<br>Private Bag X20 Hatfield 0028 South Africa
<br>Tel +27 (0) 12 420 5164
<br>Fax +27 (0) 12 420 6385
<br>Mobile:+ 27826228060
<br>Email address: philuhunga@yahoo.com</div></div></div></body></html>