Introducing Relativity by Bruce Bassett

Author:Bruce Bassett
Language: eng
Format: epub
ISBN: 9781848317703
Publisher: Icon Books

WE THEN SAY TWO GEODESICS ARE PARALLEL IF THEY ARE PARALLEL AT SOME POINT...

...THAT IS THE ANGLES THEY MAKE ON INTERSECTION WITH A THIRD GEODESIC ARE THE SAME

ALL LINES OF LONGITUDE AND THE EQUATOR ARE GEODESICS-THEY ARE “GREAT CIRCLES”

ALL THE LINES OF LONGITUDE ARE PARALLEL AT THE EQUATOR, SINCE THEY ALL INTERSECT THE EQUATOR AT RIGHT ANGLES

HOWEVER, ALL OF THE LINES OF LONGITUDE INTERSECT AT THE NORTH & SOUTH POLES

So parallel lines can meet! In this case, the space is said to have POSITIVE curvature.

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