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This worked in May 2017, was broken around June 2017 and sometime recently has started working again.

It's now as easy as:

1. In Apple Calendar, click the wireless icon next to the calendar name to reveal its WebCal URL.
2. Triple click the webcal:// URL to highlight it (crappy interface!) and then copy.
3. In Google Calendar, click the "+" button next to “Add a friend's calendar” on the left side and select "From URL”.
4. Paste the URL, click "Add Calendar" and click the left arrow button in the top left corner to return to the calendar screen.

Original reference was from How To Geek but in June 2017 Google started to return

Settings Error Could not fetch the url.

Now the magic is back. Get it while it's hot.