Let's face it, most people celebrate their 'birthday' (aka Solar Return - when the Sun returns to the same part of the sky as during our birth).
Quite a lot of women (at least) remain aware of the Moon Cycle - when we call the 'opposition' of Sun and Moon a 'Full Moon' and you can clearly see it, even in a light-polluted city. And the 'conjunction' of Sun and Moon has the label 'New Moon' (but this absence needs a bit more calculation).
So far, no real argument.
Most of us have no knowledge of 'our' Venus Return (about once a year), or Mars Return (every two years or so), or Jupiter Return (every 11-12 years), etc, for instance. And we don't care. They actually signify as much (or as little) as your Solar 'birthday', but most us don't have time to calculate or discover such relationships. We just use that handy 'calendar' thing (e.g. sometimes your Solar Return may actually happen a day before or after your 'calendar birthday', but hey, who cares, right? People have their party on the nearest Saturday, or whatever.)
I find the slower-moving planets even more interesting (and that's most of what this course seem to cover).
Saturn Returns (29, 58, 84) relate to crucial moments. As we approach 30, many people put away childish things and start to take life (and their possible future) more seriously. At the same time, if they have committed themselves early on to things, that 'looming 30' can prove a moment when they kick off the limitations and start afresh. You may get married, or divorced.
No, I am not saying "Saturn made me do it!" These planetary cycles act more like clocks (think, the Sun and the Seasons, which appear indisputable). The Jupiter Cycle of conjunctions happens every 12 years of so, and by coincidence (ahem!) my Jupiter conjunction happens on the 28th of this month, two days after the course starts. I rolled back the clock to my previous conjunction, and found myself studying 'The Tale of The Tribe' with Robert Anton Wilson (October 2005).
Other Transits can come into account, too. The outer planets move even more slowly, and we rarely complete cycles. Uranus Return happens at about 81. You may want to consider the 'opposition' transit point at age 42. And so on.
Once you get to Neptune and Pluto, their movements seem more accurately represented by cultural shifts, rather than human life cycles. And this course intends to reveal the patterns that seem to correlate with such big correlations - like 'The Thirties', or 'The Sixties', or our current times. Wouldn't you find it interesting if the current nonsense of Brexit and Trump revealed connections to earlier parts of similar cycles of cultural shifts?
That it may then refer back to my own adventures (I was 21 in 1967) would prove a perk.