Minderwiz
Thanks for the link to the Regiomontanus tables. I've downloaded them.
I checked your calculation both from midnight on 9th and midnight on 10th (I prefer to add rather than subtract). You made one error. 108.46 seconds is 1 minute 48.46 seconds, not 1 minute and 8 seconds.
So you need to subtract 40 seconds from your final ST, giving you 23:53:37 seconds, (I got 23:53:36 but a second makes virtually no difference.)
On the use of tables you should interpolate the answer from the table. That is you take the value for 52 minutes and the value for 56 minutes and estimate what the value would be for 53.5 minutes. The obvious solution is to 'split the difference' Looking at the table of houses in Filbey,that would seem to be a sound approximation as long as Sue doesn't want you to be as accurate as possible.
The same holds for the latitudes, you should interpolate the correct value.
If Sue is willing to give you the latitude (pardon the pun) to use the nearest latitude in the table, then use 51 degrees.
I did a mental approximation based on taking 70% of the difference between latitudes 50 and 51 and an even split between 52 minutes and 56 minutes and I ended up 9 minutes of longitude off the correct Ascendant. If you make that latter calculation more accurate you should get something that's near spot on.
I checked your calculation both from midnight on 9th and midnight on 10th (I prefer to add rather than subtract). You made one error. 108.46 seconds is 1 minute 48.46 seconds, not 1 minute and 8 seconds.
So you need to subtract 40 seconds from your final ST, giving you 23:53:37 seconds, (I got 23:53:36 but a second makes virtually no difference.)
On the use of tables you should interpolate the answer from the table. That is you take the value for 52 minutes and the value for 56 minutes and estimate what the value would be for 53.5 minutes. The obvious solution is to 'split the difference' Looking at the table of houses in Filbey,that would seem to be a sound approximation as long as Sue doesn't want you to be as accurate as possible.
The same holds for the latitudes, you should interpolate the correct value.
If Sue is willing to give you the latitude (pardon the pun) to use the nearest latitude in the table, then use 51 degrees.
I did a mental approximation based on taking 70% of the difference between latitudes 50 and 51 and an even split between 52 minutes and 56 minutes and I ended up 9 minutes of longitude off the correct Ascendant. If you make that latter calculation more accurate you should get something that's near spot on.