How to reduce texture scale within a material?

Currently making a skybox. How would I scale a 1024x1024 moon texture within a material without tiling and without masking it or exporting it at a lower resolution?

If you just want to scale it, just attach a texture coordinate node to the UV input of the material and tweak the settings of the coordinate node. if you want the texture to be bigger decrease the value, if you want it smaller then increase the values.

If the moon texture is part of an atlas its a different store.