. The Kansas City review of science and industry. ires a change of the diagram representing themovement of the system. The diagrams here given on Plate I represent themovement of the earth if the Sun moves in the plane of the celestial equator on theline of its intersection with the solstitial colure, and at a velocity of twenty-sevenmiles per second. Fig. i is a horizontal view as seen from the north. Fig. 2 isa perpendicular view as seen looking down from above. In Fig. i, at perihelionthe earth is north, and at aphelion south of the line, as seen in Fig. 2, In , at the vernal equinox t
. The Kansas City review of science and industry. ires a change of the diagram representing themovement of the system. The diagrams here given on Plate I represent themovement of the earth if the Sun moves in the plane of the celestial equator on theline of its intersection with the solstitial colure, and at a velocity of twenty-sevenmiles per second. Fig. i is a horizontal view as seen from the north. Fig. 2 isa perpendicular view as seen looking down from above. In Fig. i, at perihelionthe earth is north, and at aphelion south of the line, as seen in Fig. 2, In , at the vernal equinox the earth is above the line, and at the autumnal equinoxb elow it, as seen in Fig. i. The figures on Plate II include the Moons move-ment, and give us a hint on the cause of apogeal advances and regressions. Fig. I EAST. Fig. 2 PLATE I. Y;^ PERIHELION. AUTUMNAL EQUINOX. PERIHELION. AUTUMNAL EQUINOX. APHELION. 4/ APHELION. O ^H VERNAL EQUINOX. 10 Q \ ^W PERHELION. V^EST. rs VERNAL EQUINOX. PERIHELION. EAST. PLATE 11. Fig. 5 NEW MOON. LAST FULL MOON. jrlRST QUARTER. NEW MOON. WEST. 312 KANSAS CITY REVIEW OF SCIENCE. And now let us consider some things preparatory to making diagrams. Wehave the celestial heavens, with the North and South Poles, the celestial equator,and the ecliptic. These give us our points of the compass, and enable us tolocate planes. In the diagrams the following things are to be observed: 1. Parallelism of axis. The planets must keep their equatorial planes inposition. 2. A direct line from the Sun to the center of the earth must never strikethe earth more than 23^^° north or south of the Equator, but must reach thatlatitude, once north, and once south, during 3. In each case we have a hypothesis as to the rate of the Suns motion;hence we know how far it would move during the revolution of each distance, and the distance of each planet are to be carefully observed in thescale adopted in the diagram. 4. During the revolut
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1878
