The Sun enters the Zodiac sign Cancer at June 22, 2017 and leaves it on July 22, 2017. Cancer is the fourth astrological sign in the Zodiac. It is considered a water sign and one of four cardinal signs. Cancer is ruled by the Moon. Individuals born when the Sun is in this sign are considered Cancerian individuals.
In Synastry, the natives of Cancer are generally considered to be compatible with the natives of the other water signs Scorpio and Pisces, and the natives of the earth signs Taurus, Virgo, and Capricorn. Aries and Libra are signs of the other nature (masculine/extroverted), but are considered semi-compatible with Cancer due to them having the same cardinal quality.
The least compatiable sign for Cancer is Sagittarius, while Aquarius is the sign's near-opposite, but Cancerians provide valuable friendship to Aquarians depending on their birth dates specifically. They are fairly compatible with adjacent signs Gemini and Leo, yet some level of tension with these zodiac signs could occur with Cancerians. (With material from: Wikipedia)
Other features of the Cancer horoscope: