There are many books on Astrology written in modern times (since 19th Century) by various Astrologers from their own research. I didn't restrict these list of books to any specific region.
1) Handbook for the Humanistic Astrologer (1974) by Michael R. Meyer
2) A Book on Mathematical Astrology (2014) by Y.K Bansal
3) An Introduction to Astrology (1835) by William Lilly
4) Ascendant & Astrological Tables (2013) by Arun Bansal & Vinay Garg
5) A Spiritual Approach to Astrology (1983) by Myrna Lofthus
6) The Astrological Body Types (1993) by Judith A. Hill
7) Astrological Insights into Personality (1980) by Betty Lundsted
8) Astrology for Dummies (2007) by Rae Orion
9) Astrology of Professions (2004) by Col. A.K. Gour