Question: What were the limits of astrology according to John Gower?
About the article "Astrology", section "Mediaeval objections".

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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). 
 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)  
The conquest of Asia by Alexander the Great exposed the Greeks to the cultures and cosmological ideas of Syria, Babylon, Persia and central Asia.
Greek overtook cuneiform script as the international language of intellectual communication and part of this process was the transmission of astrology from Cuneiform to Greek.
Sometime around 280 BCE, Berossus, a priest of Bel from Babylon, moved to the Greek island of Kos in order to teach astrology and Babylonian culture to the Greeks.
With this, what Campion calls, ‘the innovative energy’ in astrology moved west to the Hellenistic world of Greece and Egypt.
According to Campion, the astrology that arrived from the East was marked by its complexity, with different forms of astrology emerging.
By the 1st century BCE two varieties of astrology were in existence, one that required the reading of horoscopes in order to establish precise details about the past, present and future, the other being theurgic, meaning literally ‘god-work’, and emphasised the soul’s ascent to the stars.
While they were not mutually exclusive, the former sought information about the life, while the latter was concerned with personal transformation, where astrology served as a form of dialogue with the divine. 
John Leveson-Gower, 1st Earl Gower PC (10 August 1694 – 25 December 1754), known as The Baron Gower from 1709 to 1754, was a British Tory politician, one of the first Tories to enter government in the 18th century. 
In the seventh century, Isidore of Seville argued in his "Etymologiae" that astronomy described the movements of the heavens, while astrology had two parts: one was scientific, describing the movements of the sun, the moon and the stars, while the other, making predictions, was theologically erroneous.
In contrast, John Gower in the fourteenth century defined astrology as essentially limited to the making of predictions.
The influence of the stars was in turn divided into natural astrology, with for example effects on tides and the growth of plants, and judicial astrology, with supposedly predictable effects on people.
The fourteenth century skeptic Nicole Oresme however included astronomy as a part of astrology in his "Livre de divinacions".
Oresme argued that current approaches to prediction of events such as plagues, wars, and weather were inappropriate, but that such prediction was a valid field of inquiry.
However, he attacked the use of astrology to choose the timing of actions (so-called interrogation and election) as wholly false, and rejected the determination of human action by the stars on grounds of free will.
The friar Laurens Pignon (c. 1368–1449) similarly rejected all forms of divination and determinism, including by the stars, in his 1411 "Contre les Devineurs".
This was in opposition to the tradition carried by the Arab astronomer Albumasar (787-886) whose "Introductorium in Astronomiam" and "De Magnis Coniunctionibus" argued the view that both individual actions and larger scale history are determined by the stars.