Abu Dawud

Benefits and Issues:
By "ilm al-nujum" (knowledge of the stars/astrology) is meant that knowledge through which information about the unseen, and statements regarding the auspiciousness or inauspiciousness of times, or the benefit or harm of matters, etc., are given.
In addition, those people also held the belief that these (stars) have an effect.
Whereas neither can future events be known through them, nor do they have any effect.
For this reason, the Shari‘ah has prohibited people from this soothsaying and has stated a severe warning regarding it.
However, if the stars are used to determine times, or to identify routes and directions, then this is, by consensus, permissible.
In the last sentence of the hadith, the meaning is one of threat and warning (to instill fear).

Benefits and Issues:

➊
By "ilm al-nujum" (knowledge of astrology) is meant such knowledge of the stars by which people, according to their own notions, try to determine matters of fate; this is prohibited.

➋
Some people hold the belief that a child born during the days of a particular zodiac sign among the twelve signs possesses certain specific characteristics, and that a person belonging to a particular sign is endowed with certain qualities.
These too are superstitions from the age of ignorance (jahiliyyah) which some people refer to as "knowledge."

➌
Those who claim to tell fortunes from the lines of the hand also attribute different parts of the hand to different stars and make predictions on this basis.
This too is incorrect.
One should avoid all of these.

➍
Estimating time from the rising and setting of stars, or determining whether a month will have twenty-nine or thirty days based on the movement of the moon, and determining direction during travel by means of the stars, are not included in the prohibited knowledge of astrology.

➏
The belief that stars have an effect on fate has been declared "magic" (sihr), meaning that it is also forbidden like magic, and holding such a belief is disbelief (kufr).