# 1.19.3 Particle rotational velocity

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Hello I have a question. I want to display a particle that will move around a circle. Currently, my method for ticking looks like this:

```@Override
public void tick() {
super.tick();

x = centerX + radius * Math.cos(2 * Math.PI * (age / 20f) / time);
z = centerZ + radius * Math.sin(2 * Math.PI * (age / 20f) / time);
}```

The "time" variable means the time it takes the particle to complete one circle. The problem is that changing the radius value changes the speed of the particle. I want a constant speed, independent of the radius. How can I get rid of the time variable? Ideally, the speed should be predefined. This means that regardless of the radius of the circle, the particle always moves at a fixed speed. Then "time" will be unnecessary. Is there a way? I will be grateful for your help!

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it makes sense coze your calculatin particule position  using age as angle

if you change (age / 20f) for  (age / 40f) would take 2 full seconds to complete a round

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4 minutes ago, perromercenary00 said:

it makes sense coze your calculatin particule position  using age as angle

if you change (age / 20f) for  (age / 40f) would take 2 full seconds to complete a round

Thanks for the answer! However, my point is to set the speed constant, not by editing the time of the entire rotation.

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