circle of altitude, parallel to the horizon
• (n.) A recently invented instrument for observing the heavenly bodies as they cross a given almacantar circle. See Almucantar. • (n.) Same as Almucantar.
Al`ma·can'tar noun (Astron.) (a) Same as Almucantar . (b) A recently invented instrument for observing the heavenly bodies as they cross a given almacantar circle. See Almucantar .