Old Time Celestial Atlas

In stargazing and travel, the divine circle is a nonexistent circle of subjectively extensive span, concentric with the spectator. All questions in the onlooker’s sky could be considered as extrapolated upon within surface of the heavenly circle, as it would be if it were the underside of an arch or a hemispherical screen. The divine circle is a useful apparatus for round cosmology, permitting spectators to plot positions of articles in the sky when their separations are unknown or insignificant.

Celestial Atlas

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