Final answer:
Compendiums on astrology and astronomy were written by various scholars at different times in history. The 'Almagest' by Ptolemy and the 'Tetrabiblos' by Ptolemy are well-known compendiums on astronomy and astrology respectively. Greek scholars in the 2nd century BCE also contributed to the field.
Step-by-step explanation:
The compendiums about astrology and astronomy were written by various scholars at different times in history. One of the most well-known compendiums on astronomy is the 'Almagest' written by Ptolemy of Alexandria in the 2nd century CE. It explained the motions of the planets and was considered authoritative for over a thousand years.
As for astrology, Claudius Ptolemy also wrote a treatise called the 'Tetrabiblos' in the 2nd century CE, which became a significant work on astrology.
Other notable compendiums include those written by Greek scholars in the 2nd century BCE, which democratized astrology and developed the concept of natal astrology.