Async Function Not refreshing

This function works for a single data item but it should keep refreshing every few seconds. How does this repeat?

   async function get_iss() {
       const response = await fetch('https://api.wheretheiss.at/v1/satellites/25544');
       const data = await response.json();
       document.getElementById("ISSdata").innerHTML = data.altitude;
       Textbox1.value = data.longitude;
       Textbox2.value = data.latitude;
   }
   get_iss();>