dpoint in a room is fixed whe from the floor and adjacent re called its coordinates. I such as midnight on January 1. If, then, x, y, z denote the e hat of another point, it is cleartis ts is (-a (y-b)+(-e) es remains stationary, no matter I that the distance of these pos expression for it is said to be mathematical form. If, inste ce, we have two events-sayt ppening at two places-then ▾: but eir distance apart in space we have seen that for observer to the locality of these event: he interval measurements are the ain combination of Space o all observers. interval and a velocity we bere Thus, if we can walk three miles we have covered a distance of can because w actually se properties There is and the spa the time co movement. framework of in this room back in time have taken pl taking place in event-points fo We cannot visu but if we consi round the sun reduced to two, a perpendicular to the world line of When events a the four dimension as to be independe and may, therefore with their appearan us, Dr. Harlow Shapley, working at ry, in the United States, has shown ster of stars in the constellation of ht-years distant, while some of the ds of 100,000 light-years away from -ters or spiral nebula on the boundch probably as a million light-years s of light-years. When we remem f is a distance of nearly six million g, long before the utmost limits of have disappeared from the positions k we see, them. THEORY OF RELATIVITY. concerned with what is called the vity, or that which concerns itself e Universe are, however, accelerated ally changes either in magnitude or if a stone is dropped from a height es during its fall. It falls 16 feet in he second, and 80 feet in the third. of stars in the constellation d years distant, while some of the of 100,000 light-years away in or spiral nebulae on the boun robably as a million light-re light-years. When we remet a distance of nearly six m -ng before the utmost limits f disappeared from the positions see, them. plane surface is t are situated on a is not a straight map, but is a li passing through Atlantic ocean t These lines are al In the four d lines which con called by that na Newton said t left to itself mov has substituted independently o impulse and the four dimensional the shortest lin Einstein made t qualities or prop bourhood of ma proximity to our as at places very hich rotates in its own plane. This the "line of the apses," according to coduced by the attraction of the other ed. It has long been known that this oses is greater in the case of the planet , and moreover the Newtonian theory ely. But Einstein's theory explains it t exactly the observed amount. Again, at light, being a form of radiant energy, e a ray of light passing near to a mashave its path slightly bent or deflected. xist in observations made at a total t Sobral in 1919, and again at another the Einstein theory predicts a change proceeding from a very massive body. certain sense. They emit radiations us in the spectrum of the light emitted atom we observe certain rays which lines. Einstein predicted that when tom in a very massive star or sun, the ld be slightly decreased or the line -red end of the spectrum. Recent United States by Dr. C. E. St. John ar spectrum, have confirmed this d by the attraction of the ot It has long been known that is greater in the case of the pla moreover the Newtonian the But Einstein's theory explains tly the observed amount. Agr ht, being a form of radiant energ y of light passing near to a mas its path slightly bent or deflecte n observations made at a tota al in 1919, and again at another instein theory predicts a cha ding from a very massive bod sense. They emit radiation me spectrum of the light em ve observe certain rays which Einstein predicted that wh a very massive star or sun, the lightly decreased or the spectrum. id of the States by Dr. C. E. St. Recent trum, have confirmed thi They m be found in our present stat science, all that but then face to even as also I am 5.-TH There is another relative and the rea religious and ethical This material Uni physical phenomena self-conscious personal |