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On calculating solar returns, does one use the place of birth, or the place that the person actually is?
This is one of those areas where we can find authority for whatever our position. For example Cardan, I believe, set the solar return or revolution for the birthplace. Lilly used the location of the birth, see CA page 734, but he spends only a few pages on the entire topic. Morinus is adamant, Morinus is always adamant, that the revolution should be cast for the native's location at the time of the revolution. He also claims that all his predecessors and contemporaries (17th century) set the chart for the birthplace. Therefore he is claiming to be the first to set the chart for the native's location at the time of the return. I don't know if that is true or not.

The problem with Morinus and those who argue for casting the chart for the native's location at the time of the return, is that many times we do not know where the native will be, and therefore prediction becomes difficult, and this is a predictive technique. The plus side is that the method seems to work real well, at least in hindsight - which may be the reason it works well.

I like the idea that the birthplace shows us all the potential for the coming year, and the location at the time of the return shows the potential for that place only, although I doubt that idea has traditional authority behind it. For example I worked with the appropriate solar return in effect when Arthur Ashe won the 1975 Wimbledon Men's Championship. I used Wimbledon, England as the location. It worked wonderfully. However since Ashe was born on July 10 and the 1975 Championship match was played on July 10, I used the 1974 return on the grounds that the return unfolds over time and an hour or two or three isn't much time to unfold. I have no idea if Arthur Ashe was at Wimbledon on his birthday in 1974. I have no idea where he was that day.

Try a few both ways, and see how they come out for you. Computers make research like this a lot easier.

Tom