I found a brief article about Sibly in an old volume I've featured in posts before here: The Best of the Illustrated National Astrological Journal 1933-1935, compiled by Edward A. Wagner (1978). The piece is part of a series titled Astrologers of History. These short pieces are uncredited, so I assume they were written by editorial staff of the National Astrological Journal - or perhaps a credit appeared in some earlier "Best of" volume.
Below I've copy-typed what the author, whoever he/she was, had to say. Sibly's date of birth is given in New Style. A piece at Skyscript on Sibly quotes his birth date in Old Style: 30 January 1751. "L.M.T." I take as being the same as GMT : London Mean Time/Greenwich Mean Time.
One of the most noteworthy astrologers of the late 18th century was Ebenezer Sibly. He was born at Bristol, England, February 10, 1751 (N.S.), on a Wednesday at 11.33 am (L.M.T.) according to a horoscope of his own making.
With the intention of following medicine as a career, he came to London in his youth to study surgery, and afterwards, in 1792, graduated as a doctor of medicine at King's College, Aberdeen.
He settled for a time at Ipswich, but, fascinated by the study of astrology, he returned to London, where his brother Monoah, who was a well-known Swedenborgian preacher and astrologer, had a place of worship in Friars Street, Ludgate Hill.
Ebenezer Sibly was a voluminous writer on astrology and allied subjects. He wrote "Magazine of Natural History", in three volumes, "A New and Complete Exposition of the Occult Sciences", in two volumes, "The Key to Psychic and the Occult Sciences. His most important work was a large book, "The Celestial Science of Astrology", first published at London in 1785. The last edition appeared in 1817. These volumes contain many valuable observations and much curious information of great interest to students of astrology.
He was the first astrologer to publish a horoscope of the United States of America. This appeared in the 1785 edition of his large book on astrology. There is a symbolic picture representing the chart of the Declaration of Independence. This chart was cast for July 4, 1776, at 10:10 p.m. From it he predicted that "America in time should have an extensive and rising commerce and advantageous and universal traffic to every quarter of the globe and great prosperity among its people."
In the same work he makes an interesting allusion to the ill-fated poet Thomas Chatterton, whose nativity he gives and from which he prognosticated his fatal end. He gives also a very interesting delineation on the horoscope of the Rev. George Whitefield, who was a friend of Benjamin Franklin.
Ebenezer Sibly stands out as one of the great geniuses of astrology and it is to be regretted that his life was cut short at an early age. He died at London in his 48th year, on a Wednesday at 1 o'clock p.m., October 30, 1799.
There's a small image of a hand-drawn chart in the article, it doesn't indicate whether it comes from Sibly's writings or the magazine staff - but it doesn't copy well. The only difference in the chart below, by my software, and that in the article is the addition of Pluto, and a few minutes (not degrees) of difference in some planets' positions.
Here's a quadruple Aquarius-type with Gemini rising and Jupiter sextile his Aquarius stellium. Is there any wonder he became such a prolific writer, and with some rather out-of-ordinary interests? Additionally two personal planets sextile his Sun from Jupiter's home sign Sagittarius, bringing even more harmony to this chart. Natal Moon in Leo (known for leadership and love of the spotlight) opposes the Aquarius stellium - a balancing act perhaps, and indication that one day Sibly's work would become more famous than he had ever imagined?
