Question: How did John Gower define the limits of astrology?
About the article "Astrology", section "Mediaeval objections".

Candidate passages:
According to John Gower in Book 7 of the "Confessio Amantis", this plant was the herb of the fourth star of Nectanabus' astrology, Capella.
Gower uses the older name, Alhaiot (VII:1338). 
The fourteenth-century English poets John Gower and Geoffrey Chaucer both referred to astrology in their works, including Gower's "Confessio Amantis" and Chaucer's "The Canterbury Tales".
Chaucer commented explicitly on astrology in his "Treatise on the Astrolabe", demonstrating personal knowledge of one area, judicial astrology, with an account of how to find the ascendant or rising sign.
In the fifteenth century, references to astrology, such as with similes, became "a matter of course" in English literature.
In the sixteenth century, John Lyly's 1597 play, "The Woman in the Moon", is wholly motivated by astrology, while Christopher Marlowe makes astrological references in his plays "Doctor Faustus" and "Tamburlaine" (both c. 1590), and Sir Philip Sidney refers to astrology at least four times in his romance "The Countess of Pembroke's Arcadia" (c. 1580).
Edmund Spenser uses astrology both decoratively and causally in his poetry, revealing "unmistakably an abiding interest in the art, an interest shared by a large number of his contemporaries", while George Chapman's play "Byron's Conspiracy" (1608) similarly uses astrology as a causal mechanism in the drama.
William Shakespeare's attitude towards astrology is unclear, with contradictory references in plays including "King Lear", "Antony and Cleopatra", and "Richard II".
Shakespeare was familiar with astrology and made use of his knowledge of astrology "in nearly every play he wrote", assuming a basic familiarity with the subject in his commercial audience.
Outside theatre, the physician and mystic Robert Fludd practised astrology, as did the quack doctor Simon Forman.
In Elizabethan England, "the usual feeling about astrology ... that it is the most useful of the sciences".
The most famous piece of music to be influenced by astrology is the orchestral suite "The Planets".
Written by the British composer Gustav Holst (1874–1934), and first performed in 1918, the framework of "The Planets" is based upon the astrological symbolism of the planets.
Each of the seven movements of the suite is based upon a different planet, though the movements are not in the order of the planets from the Sun.
The composer Colin Matthews wrote an eighth movement entitled "Pluto, the Renewer", first performed in 2000.
In 1937, another British composer, Constant Lambert, wrote a ballet on astrological themes, called "Horoscope".
In 1974, the New Zealand composer Edwin Carr wrote "The Twelve Signs: An Astrological Entertainment" for orchestra without strings. 
 John Leveson-Gower, 1st Baron Gower (1675–1709), eldest son of the 4th Baronet John Leveson-Gower, 2nd Baron Gower (1694–1754) (created Earl Gower in 1746)  
Richard Leveson-Gower (30 April 1726 – 19 October 1753) was the fourth son of John Leveson-Gower, 1st Earl Gower.
He served as Member of Parliament for Lichfield from 1747 until his death, aged 27.
He did not marry. 
The following is the beginning of the Prologue from "Confessio Amantis" by John Gower.