10 
The Sun at the Equinoxes has no Right Ascension, his aR is 
zero, the same zero from which the ar of all the stars is reckoned. 
And when the Sunrises at that-season our terrestrial East point 
coincides with that zero, which is .also the celestial East point. 
Therefore if at that sunrise we observed that the star glanced 
along the face of our wall, we should know that the star’s angular 
distance from the celestial East point coincided with the angle that 
our wall bore from our terrestrial East point. We should know 
what was the ar* of that star, for it would be the same as the 
angle that our wall bore from our East. And, as the Earth keeps 
turning one point after another of its surface to the Sun and 
opening up a new day with sunrise for that point of its surface, so 
a new East point of the Earth will, during the 24 hours, be 
constantly presented to the Sun; and if any number of walls had 
been built at any intervals round the world along, say, any parallel 
of Latitude, each bearing from the local East point the angle 
which corresponded to the ar of any star, that star would glance 
for an instant along the face of each of those walls as it made its 
transit over them, one after the other, and if the hour of the 
transit was 6 a.m. at an Equinox, then at that same instant 
sunrise would commence for that part of the Earth’s surface. 
Let us, instead of the wall, put an alignment from a certain 
trilithon upright to, say, the Southern outlying stone; then, 
if the stars did not shift their positions, and if at sunrise at the 
Vernal Equinox any star was visible to an observer looking along 
that alignment a thousand or more years ago, it would be visible 
now to an observer from the same station looking along the same 
alignment at sunrise at the Vernal Equinox. And when the 
observer so saw that star he would know that the season was 
the Vernal Equinox. 
But we know that the position of the stars is constantly shifting, 

* As the printer’s fount does not include the usual symbol for Right 
Ascension, the letters aR throughout this paper are used instead, and signify 
Right Ascension. 
