Parallax is the apparent shift in the position of an object when viewed from two different locations. The farther away an object is, the smaller the parallax.

Earth is a planet within our solar system, which is relatively close to the Sun. Therefore, its parallax would be very small and difficult to measure.

Arcturus is a giant star located in the constellation Boötes, much farther away from Earth than our own Sun. This greater distance means that Arcturus would have a larger parallax.

In summary:

* Closer objects have larger parallaxes.

* Arcturus is much farther away than Earth.

* Therefore, Arcturus would have a greater parallax than Earth.