KONSEP KESEJAJARAN GARIS DALAM GEOMETRI EUCLID DAN GEOMETRI RIEMANN SERTA APLIKASINYA DALAM KAJIAN ILMU FALAK

The line parallel in the geometry of Euclid and Riemann in mathematical studies has a difference. Differences in the concept of line alignment, of course, will make a difference in the next studies. Based on this, this research is designed to study the concept of line alignment in the geometry of Euclid and Riemann, then its application in the study of Falak science Based on the focus of the discussion, the research method is planned in the form of descriptive qualitative, with data source literature related to the focus research and data were collected by reviewing the documents. Further data collected were analyzed by using inductive analytical descriptive method using grounded theory approach. Based on this research we get a complete explanation of the concept of line alignment in the geometry of Euclid and Riemann, that in Euclid geometry known line alignment, whereas in Riemann geometry do not know the line alignment. With regard to the application of the line alignment in Euclid geometry in the study of astronomy can be seen in the concept of dip (lower horizon), whereas the line universe in the geometry of Reemann in the study of astronomy can be found in the concept of geographical latitude in a place.