* Apparent size: The object appears larger. This is because the angle it subtends in the observer's eye increases.
* Angular size: This is a more precise way of measuring the apparent size. It is the angle between the lines of sight from the observer to the opposite edges of the object.
* Brightness: The object appears brighter, as more of its light reaches the observer's eye. This is especially noticeable with point sources of light, like stars.
* Parallax: This is the apparent shift in an object's position against a distant background as the observer moves. The closer the object, the greater the parallax.
* Relative velocity: If the object is moving, its relative velocity with respect to the observer increases as it gets closer.
It's important to note that these increases are relative to the observer's position. An object's actual size, brightness, and velocity remain constant.
