Old astronomical instrument
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ARMILOld astronomical instrument.
ARMILLARYSPHEREAncient astronomical instrument
GNOMONEarly astronomical instrument
coelostatan astronomical instrument used to reflect light on to a telescope
coelostatsCOELOSTAT, an astronomical instrument used to reflect light on to a telescope
gnomonsearly astronomical instrument consisting of a vertical shaft, column, or the like, for determining the altitude of the sun or the latitude of a position by measuring the length of its shadow cast at noon
gnomonearly astronomical instrument consisting of a vertical shaft, column, or the like, for determining the altitude of the sun or the latitude of a position by measuring the length of its shadow cast at noon
chronometerAn instrument for measuring time, esp. one designed to keep accurate time in spite of motion or variations in temperature, humidity, and air pressure. Chronometers were first developed for marine navigation, being used in conjunction with astronomical observation to determine longitude
chronometersAn instrument for measuring time, esp. one designed to keep accurate time in spite of motion or variations in temperature, humidity, and air pressure. Chronometers were first developed for marine navigation, being used in conjunction with astronomical observation to determine longitude
astrolabeastronomical instrument for taking the altitude of the sun or stars and for the solution of other problems in astronomy and navigation: used by Greek astronomers from about 200 b.c. and by Arab astronomers from the Middle Ages until superseded by the sext
astrolabesAn instrument formerly used to make astronomical measurements, typically of the altitudes of celestial bodies, and in navigation for calculating latitude, before the development of the sextant. In its basic form (known from classical times), it consists of a disk with the edge marked in degrees and a pivoted pointer