In a throwback to Points Along A Line from several years back, here's a quick expression for ya-- "Point on a Circle." Straightforward, yeah? Yeah.

var offsetAmount = [0, 0];
var circleRadius = 100;
var targetAngle = 0;
var x = offsetAmount[0] + circleRadius * Math.cos(targetAngle);
var y = offsetAmount[1] + circleRadius * Math.sin(targetAngle);

[x, y]

The first three lines are just setting up the circle & any offset; how big is it, and where on the circle do we want the point to be? In the preset, these will be linked to controllers so you can pick a layer to orbit around, and easily control the angle & radius.

This is super simple-- check it out!

Download here