Cancer

Cancer is the fourth sign of the zodiac and the first of the water signs. This year the Sun is in Cancer from 21 June to 22 July 2026. It is the Moon’s sign, and in Ptolemy’s scheme it is one of the two places where the Sun turns back.

Where the Sun turns

Ptolemy names two tropical signs, Cancer and Capricorn, and defines Cancer as “the first thirty degrees after the summer solstice”. The name comes from what the Sun does at the start of each: it appears “to change his course towards a contrary latitude”. Our data files Cancer under the modern word cardinal. William Lilly, between the two, has “a Solstice Signe”.

The summer is a northern one. Ptolemy wrote from the northern hemisphere, and when he says the Sun causes summer in Cancer he is describing his own half of the world.

The Moon’s house

The same northern view decides the sign’s ruler. “Cancer and Leo are the most northerly of all the twelve signs”, Ptolemy writes, and they “approach nearer than the other signs to the zenith of this part of the earth”. For that reason they go to the two lights: “Leo for the Sun, as being masculine; and Cancer for the Moon, as being feminine.” The five planets that follow in his scheme receive two signs each. The Moon has this one.

Two more planets are tied to Cancer by his rule of exaltations. Jupiter, he says, “becomes most northerly, and augments his peculiar influence when in Cancer”, and so “obtains his exaltation in that sign”. Mars is treated the opposite way, with “his fall in Cancer”.

Mars returns in the triplicity all the same. The group of Cancer, Scorpio and Pisces is left to Mars through his house Scorpio, but because its signs are feminine, “the Moon by night and Venus by day, through their feminine condition, govern it, together with Mars”. That Mars has his fall in Cancer and still shares in the rule of its triplicity is our observation from two chapters; Ptolemy does not remark on it.

The Cancer character, as the old books give it

Lilly opens his line with the ruler: Cancer “Is the onely house of the Moon”. He goes on to call it “Watry, Cold, Moyst, Flegmatick, Feminine, Nocturnal, Moveable”. “Moveable” is his word for cardinal. These are qualities for judging a chart, not a portrait of people.

Alan Leo’s portrait has a modest line: “Persons born in this sign are characterised as being slow but sure.” On memory he uses a superlative of his own: “The Cancer individual has the most remarkable memory of any given by the twelve signs, and it is no difficulty for them to recall minute incidents of the past.”

Home weighs on the sign as he sees it. “Their highly sensitive nature makes them feel very keenly everything that affects the other members of the family, and for them domestic affairs become a kind of brake on their own individual progress.” He adds that “their feelings are very easily wounded”, and that they “always yearn for the sympathy of others”.

One sentence of his sets its words in pairs: “They are very reserved and sensitive, sympathetic and tenacious, persistent and impatient, impressionable and emotional.”

A water sign among three

Scorpio and Pisces are the other two water signs, the same three Ptolemy joins in his fourth triplicity. In the list of matches below, which comes from our formula, Pisces is first and Cancer with Cancer is second. Taurus, an earth sign, is third, ahead of Scorpio, and Virgo is fifth. Capricorn, the sign opposite Cancer, sits in the middle of the list, and Aries is last. The method behind the order is on how we score.

Alan Leo’s chapter on Cancer has no sentence about which signs it marries well, so the order here rests on the formula alone. It compares signs and says nothing about any two people.