...comparatively easy. Thirdly, the difficulty to an adult is not in understanding the diagrams showing the inclination of the Earth's axis to the plane of its orbit, and the persistence of the axis in pointing in the same direction throughout its whole annual course...

...hemisphere plot the prime meridian. 3. Locate the zones and the prime meridian on a globe. V. Problems: 1. The inclination of the earth's axis to the plane of its orbit is 23 1/2 degrees, and each of the zone boundaries is either 22>l/2 degrees from a pole or 23^4 degrees...

...cumulative effect is possible with regard to the obliquity of the ecliptic, that is to say, with regard to the inclination of the earth's axis to the plane of its orbit. Schiaparelli l treats the problem in a more general manner, making no initial assumptions as to total...

...causes which combine to give us our change of seasons: the revolution of the earth around the sun, and the inclination of the earth's axis to the plane of its orbit. 13. The Measurement of Time. — Experiment 9. — On a fanday place a sundial in an exposed position,...

...shining? 6. What causes day and night? 7. Why do day and night vary in length? 8. How many degrees is the inclination of the earth's axis to the plane of its orbit? 9. What is the position of the earth with reference to the sun on June 21? September 22? December 21...

...causes which combine to give us our change of seasons : the revolution of the earth around the sun, and the inclination of the earth's axis to the plane of its orbit. OUR OWN WORLD Meridians and Parallels of Latitude. — For purposes of measurement, circles of any...

...— See Appendix A. 100. The Obliquity of the Ecliptic Points to a Third Directional Activity Factor. The inclination of the earth's axis to the plane of its orbit shows conclusively that a third activity factor influences the system. Since the obliquity of the ecliptic...

...place. A single revolution of the earth marks a period of 24 hr. or one day. Sun Time. — Owing to the inclination of the earth's axis to the plane of its orbit and the eccentricity of the orbit, the sun's apparent motion in the celestial sphere is not wholly...

...those with less. But two considerations Temperature profoundly modify this ideal simplicity. First, the inclination of the earth's axis to the plane of its orbit which results in the alternation of summer and winter in all except equatorial regions : secondly,...

...the sun at the equinoxes is removed one degree from the zenith. This primary fact, taken along with the inclination of the earth's axis to the plane of its orbit, is the fundamental factor in climate and thus in all that follows from the climatic zones. A good start...