An equatorial mount has two main axes: the right ascension (RA) axis aligned with Earth's rotational axis, and the declination (DEC) axis perpendicular to it.
By rotating the RA axis at the same speed as Earth but in the opposite direction, the mount counters Earth's rotation, keeping stars in view with just one movement.
The declination axis lets you point the telescope north or south to target any object in the sky.
This clever design simplifies tracking and is essential for long-exposure astrophotography.