But the book also have some statements like these :
" Always should the domains of the physical (electrochemical) and the mental response to environmental stimuli be differentiated, and in turn must they all be recognized as phenomena apart from spiritual activities. The domains of physical, mental, and spiritual gravity are distinct realms of cosmic reality, notwithstanding their intimate interrelations."
There are many other statements and affirmations of cosmic facts of this kind which tell us that the human personality traits are affected by a person's time and place of birth on account of the universal gravity lines influencing the genes that determine the personality traits of humans.
But they are not due to the stars and the planets.
Our astrologers happen to see the planets and stars of a particular type during the time of the year at a particular location and they have been able to classify people's personalities according to the stars or planets. The Urantia Book says that these planets and stars are not responsible, but something else coming from far beyond. Gravity has a role, but not the gravity of the stars and the planets we had identified.
Again the Urantia Book authors for reasons known to them do not encourage us to go exploring this and waste our energies and time on such things which they consider as irrelevant to our lives on a long term perspective.