almucantar

VPon thys forſayde plate ben compaſed certayne cercles, that hyghten almicanteras : of whyche ſome of hem ſemen parfyte cercles, and ſome ſemen imparfyte.

Upon this aforementioned plate are compassed certain circles that are called almucantars, of which some seem like perfect circles and some seem imperfect.]

A wide field of work appears open in the application of photography to meridian instruments, or to the almucantar. The sensitive plate should be substituted for the reticule, and the position marked by a graver attached to the tail-piece of the telescope.