Precession of the Equinoxes, page 7

Appendix 1: Effect of the Rising Sun

In this essay, all dawn sky shots have been shown with all stars visible, but in reality we'll see something like the shots shown below (constellation shapes left overlaying the sky):

Figure 14: The darkest hour before the dawn, all stars visible.

Figure 15: Sun arising, the faintest stars have gone, but brightest remain visible.

Figure 16: Sun now appearing, all stars gone.