http://www.englishforums.com/English/EslGeneralEnglishGrammar-Questions/Forum12.htmAsk your questions on grammar and get your sentence checked. We answer lots of different types of general English grammar questions here. <font color=red>DO NOT post paragraphs and compositions here. Post them in our <a href="http://www.englishforums.com/English/EssayReportCompositionWriting/Forum9.htm"><b>Essay, Report and Composition Writing Forum</b></a>.</font>enXMOD (Build: 3607.32596)http://www.englishforums.com/English/BasedBasingOnTheData/gxjmb/post.htm#572755Wed, 22 Apr 2009 14:22:48 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:572755Mister Micawber0http://www.englishforums.com/English/BasedBasingOnTheData/gxjmb/post.htm#572755http://www.englishforums.com/English/comments12-572755.xml. Neither is right. The understood subject of the nonfinite clause must be the same as for the main clause, but you don&#39;t supply enough text to make that clear. Do something like this: Based on the data, their calculations demonstrated to the astronomers that the two planets have intersecting orbits. Basing their calculations on the data, the astronomers learned that the two planets have intersecting orbits. .http://www.englishforums.com/English/BasedBasingOnTheData/gxjmb/post.htmThu, 22 Jan 2009 15:22:48 GMT946f00bb-57d3-4b7b-a9a2-059b5341af52:572714Peaceblinkfriend1http://www.englishforums.com/English/BasedBasingOnTheData/gxjmb/post.htmhttp://www.englishforums.com/English/comments12-572714.xmlHi all,  Based  on the data, the astronomers learned that the two planets have intersecting orbits. Basing  on the data, the astronomers learned that the two planets have intersecting orbits. How does the second sentence differ from the first? I mean I think the second sentence reads a bit weird but I don&#39;t know if it is incorrect.  Thanks PBF