Astronomic station Astronomic station is a point on the earth at which observations are made on heavenly bodies to determine latitude, longitude, or azimuth.
Astronomic observation Astronomic observation refers to the observation made on celestial bodies to determine longitude, latitude, time, and/or azimuth.
Astronomical triangle Astronomical triangle is the spherical triangle formed by joining the observer’s elevated pole, his zenith and the position of the body on the celestial sphere.