Difference

Astrolabes were used by ancient Greeks to measure the movements of the sun and stars – to observe, predict and tell the time.

The astrolabe was used in the ancient world to navigate and find direction.

Binoculars allow the viewer to see distant objects with sharp clarity.

The chronometer is a precise timekeeping instrument used to determine longitude by means of celestial navigation.

The clock has played a vital role in navigation since John Harrison’s clock in the 18th century enabled longitude to be measured accurately.

The compass is a navigational instrument which finds direction by aligning itself to the earth’s magnetic field.

The quadrans vetus (old quadrant) was an instrument used to survey and find the precise time.

The sextant enabled precise measurement of position when navigating on a moving ship.

The stardial of the heavens showed the location of the stars and constellations on exact dates.

The sundial measures time by the position of the sun, using a fixed object to cast a shadow.

The Augsburg sundial was invented in Germany, measuring time by the angle of the sun.

A telescope is designed to observe remote objects, and it means ‘see from afar’.