The tropical forms all disappear in these zones, as the equatorial do in the tropical zones.
At that time the declination of the sun is 23½ north of the equatorial line.
We may therefore say that the equatorial circumference of the earth is 20,400 miles.
This is a rough stone, not worked save in an equatorial groove.
This equatorial form is, moreover, what all the astronomers were expecting.
The ivory of their tusks constitutes the wealth of the Equatorial Province.
Such would be the appearances to an inhabitant of the equatorial regions.
The two spheres connected by four beams, two opposite in the main axis, two opposite in the equatorial axis.
Polar tubuli cylindrical, longer than the half main axis, only one-fourth as broad the equatorial constriction.
Perpendicular to this axis is the equatorial plane of the disk by which it becomes divided into equal halves.