No information could be found on Walter Whitney.
William Lilly (1602-81) was the most successful and influential astrologer of 17th century England. His career spanned the turbulent years of the English Civil Wars, Cromwell's Protectorate and the Restoration of Charles II. His almanacs and pamphlets had a tangible effect on public opinion, his clients included many of the leading political and military figures of an age when most people naturally believed that the stars and planets had a direct influence on human affairs.
From the description of Notes on the life and works of William Lilly, 1935-1982 (Unknown). WorldCat record id: 54487357