If you have had an astrology reading, you will know how different planets affect your life and the roles they play.
Astrologers relate this information to the position of the planets in a known horoscope (any person's horoscope) and take this account while making predictions about the present and future. This shows the current position of the planets and the zodiacs through which they are passing.
The chart given in the 'Ephemeris' is the horoscope chart for today, cast at the time shown.