A few nice astrology images I found:

Zodiac sign of SAGITTARIUS in a 15th century manuscript

Image by Virtual Manuscript Library of Switzerland
The zodiac sign of SAGITTARIUS is associated with the month of November and it is represented by the archer. In some of the standard medieval iconographic compositions, the archer is usually a centaur (half man, half horse) and is always shown in full flight with a bow and arrow about to be shot. Alternatively, the archer is represented by a man with no animal parts. In the modern horoscope the zodiac sign of SAGITTARIUS covers the period from about 22 November until 21 December.

Link to the "Zodiac sign of SAGITTARIUS" set

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Manuscript title: Genus Arati

Origin: Naples (Italy)

Period: 15th century

Image source: Cologny, Fondation Martin Bodmer, Cod. Bodmer 7: Genus Arati (www.e-codices.unifr.ch/en/cb/0007/32r)

Zodiac sign of LIBRA in a 15th century manuscript

Image by Virtual Manuscript Library of Switzerland
The zodiac sign of LIBRA is associated with the month of September and in the medieval iconographic compositions it is often represented by the figure of a woman with scales. The figure of a woman is usually shown full-length, either frontally or in profile. She is often portrayed holding the scales in balance. Sometimes the woman is missing and simply only the scales are shown. In the modern horoscope the zodiac sign of LIBRA covers the period from about 23 September until 23 October.

Link to the "Zodiac sign of LIBRA" set.

Link to the "Zodiac signs" collection.

Manuscript title: Book of Hours

Origin: Nantes ? (France)

Period: 15th century

Image source: Genève, Bibliothèque de Genève, Ms. lat. 33, p. 9r – Book of Hours (www.e-codices.unifr.ch/en/bge/lat0033/9r)