Just found a great book while looking through Google books:
Nauticum astrologicum: or, The astrological seaman: directing merchants, mariners, captains of ships, ensurers, &c. how (by God's blessing) they may escape divers dangers which commonly happen in the ocean. Unto which is added a diary of the weather for XXI years together, exactly observed in London, with sundry observations thereon by John Gadbury (1710)
http://books.google.co.uk/books?id=y4JZAAAAYAAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false