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A tool for navigation that measures the angular distance between two visible objects, particularly useful for determining latitude at sea by measuring the angle between a celestial body and the horizon.

An optical instrument designed to make distant objects appear nearer, using an arrangement of lenses or mirrors to gather and focus light and other forms of electromagnetic radiation.

An apparatus for producing and observing the spectrum of light or other radiation emitted by substances, used to analyze their composition.

A device that superimposes electromagnetic waves to extract information about waves by the resulting pattern of interference.

A type of telescope that detects and amplifies radio waves emitted by celestial sources, rather than detecting visible light, and is used to observe astronomical phenomena such as stars, galaxies, and black holes.

An electronic light sensor used in various scientific instruments, including modern telescopes, to capture images in the form of digital data.

A theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation.

A type of amateur telescope which is simple to manufacture and mount, optimized for observing faint, deep sky objects such as nebulae and galaxies.

A special-purpose telescope used to observe the Sun, designed with filters and detectors to handle the intense brightness and heat without damaging the instrument.

A quarter-circle shaped instrument used for measuring angles in the sky and determining the altitude of celestial bodies.

An ancient astronomical instrument used for solving problems related to time and the position of the stars and planets.