What is the instrument used to measure electric current?

Question

What is a navigation instrument used until the 18th century to measure the angles between heavenly bodies, or between them and the horizon?

Answer 1

ammeter

A voltmeter is an instrument used for measuring electrical potential difference between two points in an electric circuit. An ammeter is a measuring device used to measure the electric current in a circuit.

Answer 2

"AMMETER"
An ammeter is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.