Well, my first draft of a translation of the astrological part of the essay linked to above vanished into the digital ether after I closed my computer without saving the file. A second attempt will just have to wait until I have time next week or the week after, I suppose.
To add to my previous post, and for the sake of accuracy, I should mention that the cantankerous French astrologer-philosopher Jacques Halbronn has written a couple of articles on this very topic [astronomical/calendrical considerations] in recent years, as an appendix to a book of his on Etteilla from 20-odd years ago.
And there are two French bloggers who have written a number of articles dealing with this subject too, but unfortunately those blogs have not been active for some years now.
[see, for example: http://itineraire-du-fou.blogspot.co...aisonnier.html
, or http://lecycledelarouedefortune.blog...-analemme.html