WEEKLY HOROSCOPE

When you switch, astrologically seen, repeatedly between two sun signs.

In the astrology some people seem to switch continually between two successive sun signs.
In your year of birth however, your day of birth has just one of these two sun signs. That's is your sensing.
It is therefore possible for two people to have the same day of birth, but another - the next or previous - sun sign, because they were born in different years.