Link to iPhone calendar:

https://calendar.google.com/calendar/ical/er42regvg1qer0l8otvgelt5no%40group.calendar.google.com/public/basic.ics

Open Google calendar in new tab:

https://calendar.google.com/calendar/embed?src=er42regvg1qer0l8otvgelt5no%40group.calendar.google.com&ctz=America%2FChicago