almacantar

/AA0 L M AA0 K AA0 N T AA1 R/
noun
  1. 1

    A small circle on the celestial sphere, parallel to the horizon, that is used in astronomy and navigation to show altitude of a star or any other heavenly body.

  2. 2

    An instrument for observing the heavenly bodies as they cross such a circle.

Source: https://en.wiktionary.org/wiki/almacantar, https://en.wiktionary.org/wiki/almucantar