Let _NZSVL_ be the Earth, _SONA_ its Axis produced to the starry Heavens, and terminating in _A_, the present north Pole of the Heavens, which is vertical to _N_ the north Pole of the Earth. Let _EOQ_ be the Equator, _T_♋_Z_ the Tropic of Cancer, and _VT_♑ the Tropic of Capricorn: _VOZ_ the Ecliptic, and _BO_ its Axis, both which are immoveable among the Stars. But, as [57]the Equinoctial points recede in the Ecliptic, the Earth’s Axis _SON_ is in motion upon the Earth’s center _O_, in such a manner as to describe the double Cone _NOn_ and _SOs_, round the Axis of the Ecliptic _BO_, in the time that the Equinoctial points move quite round the Ecliptic, which is 25,920 years; and in that length of time, the north Pole of the Earth’s Axis produced, describes the Circle _ABCDA_ in the starry Heavens, round the Pole of the Ecliptic, which keeps immoveable in the center of that Circle. The Earth’s Axis being 23-1/2 degrees inclined to the Axis of the Ecliptic, the Circle _ABCDA_, described by the north Pole of the Earth’s Axis produced to _A_, is 47 degrees in diameter, or double the inclination of the Earth’s Axis. In consequence of this, the point _A_, which at present is the North Pole of the Heavens, and near to a Star of the second magnitude in the tail of the constellation called _the Little Bear_, must be deserted by the Earth’s Axis; which moving backwards a degree every 72 years, will be directed towards the Star or Point _B_ in 6480 years hence: and in double of that time, or 12,960 years, it will be directed towards the Star or Point _C_; which will then be the North Pole of the Heavens, although it is at present 8-1/2 degrees south of the Zenith of _London L_. The present position of the Equator _EOQ_ will then be changed into _eOq_, the Tropic of Cancer _T_♋_Z_ into _Vt_♋, and the Tropic of Capricorn _VT_♑ into _t_♑_Z_; as is evident by the Figure. And the Sun, in the same part of the Heavens where he is now over the earthly Tropic of Capricorn, and makes the shortest days and longest nights in the Northern Hemisphere, will then be over the earthly Tropic of Cancer, and make the days longest, and nights shortest. So that it will require 12,960 years yet more, or 25,920 from the present time, to bring the North Pole _N_ quite round, so as to be directed toward that point of the Heavens which is vertical to it at present. And then, and not till then, the same Stars which at present describe the Equator, Tropics, polar Circles, and Poles, by the Earth’s diurnal motion, will describe them over again. _A_ TABLE _shewing the Time contained in any number of Sidereal, Julian, and Solar Years, from 1 to 10000_.