Historical Charts – some notes
Importing historical charts – New Style versus Old Style
AC Blog: Historical Charts – Culpeper
You may need to change to Old Style after an historical chart has been imported. Go to Edit Chart to do this after import.
For instance the chart of Nostradamus after import is set to LMT and NS when it should be set to OS (Old Style), not NS.
Rule of thumb, before 1752 = Old Style (OS). DOB of Nostradamus is 14th dec 1503.
Here’s a comparison of charts to show that AC can handle historical chart accurately.
Here’s the same chart from astro.com