In the 1640s he was appointed licenser of mathematical publications, and so in effect a censor of astrological works, for the Stationers' Company.
[1] He was born at Manchester 23 March 1601 OS (equals April 3, 1601); his nativity is among the Ashmolean manuscripts.
He was apprenticed to a haberdasher in London, taught writing at Hadley School in Middlesex,[2] and clerk to two city magistrates.
He obtained a reputation from a prediction of the deaths of Gustavus Adolphus and Frederick V, Elector Palatine, founded on a solar eclipse.
In 1648 Booker and Lilly were required to come to the siege of Colchester to encourage the Parliamentarian troops with predictions.