The zoom sessions are set up to record automatically. The recording begins as soon as anyone logs on, hence there will generally be a few minutes of dead air during which you will see something like the image on the right until I get on. I will indicate on each link below how far into the recording you need to go to get to the start of the actual class session.
They started including a (poor) audio transcription as of the 2020-03-27, so the actual start time can be gleaned from that now.