Cusp (astrology)

In astrology, a cusp (from the Latin for spear or point) is the imaginary line that separates a pair of consecutive signs in the zodiac or houses in the horoscope.

[1] Because the solar disc has a diameter of approximately half a degree, it is possible for the Sun to straddle the cusp as it moves across the sky.

When this occurs at the moment of their birth, such a person is said to be "born on the cusp," and some interpretations of astrology hold that their life is influenced by the characteristics of both signs.

In this view, in order to discover what sign the Sun was in, the exact time must be considered.

These astrologers may consider the Sun to be "on the cusp" even when its centre is as much as two degrees away from the sign boundary.