Mercury in the 4th House: Meaning by Rising Sign
The short answer
With whole-sign houses, Mercury is in your 4th house when it is in the sign 3 signs on from your rising sign: Mercury in Cancer for Aries rising, Mercury in Capricorn for Libra rising, and so on for all twelve rising signs.
What Mercury in the 4th house means
Mercury describes how you think, talk and make arrangements. In the 4th house of home and family, that plays out through home, family, where you are from, and your private life.
The 4th is one of the four angular houses, the corners of the chart, where planets tend to show as events other people notice. Its natural sign is Cancer, so Mercury here takes on some of Cancer's concerns whatever sign it is actually in.
With whole-sign houses, Mercury sits in your 4th house when it is in the sign 3 signs on from your rising sign: for Aries rising that means Mercury in Cancer. A transit of Mercury through one house lasts about 36 days, because that is how long Mercury usually stays in one sign.
Which sign puts Mercury in your 4th house
Find your rising sign in the left column. If your Mercury is in the sign beside it, your Mercury is in the 4th house.
| Your rising sign | Mercury in the 4th house |
|---|---|
| Aries rising | Mercury in Cancer |
| Taurus rising | Mercury in Leo |
| Gemini rising | Mercury in Virgo |
| Cancer rising | Mercury in Libra |
| Leo rising | Mercury in Scorpio |
| Virgo rising | Mercury in Sagittarius |
| Libra rising | Mercury in Capricorn |
| Scorpio rising | Mercury in Aquarius |
| Sagittarius rising | Mercury in Pisces |
| Capricorn rising | Mercury in Aries |
| Aquarius rising | Mercury in Taurus |
| Pisces rising | Mercury in Gemini |
How long a Mercury transit of the 4th house lasts
Mercury stays in one sign for about 36 days on average, so a transit of Mercury through your 4th house lasts about that long: as little as about 14 days and as much as about 2 months across the charted years.
About the 4th house
The 4th house of home and family: home, family, where you are from, and your private life. Its natural sign is Cancer.
How the houses are counted
Houses here use whole-sign counting: your rising sign is the whole 1st house, the next sign the 2nd, and so on around the zodiac. Many astrologers use Placidus or another quadrant system instead, which can move a planet close to a sign boundary into the neighbouring house. Either way you need an accurate birth time, because the rising sign changes about every two hours.
Mercury in the other houses
Mercury in the 1st house · Mercury in the 2nd house · Mercury in the 3rd house · Mercury in the 5th house · Mercury in the 6th house · Mercury in the 7th house · Mercury in the 8th house · Mercury in the 9th house · Mercury in the 10th house · Mercury in the 11th house · Mercury in the 12th house
Other planets in the 4th house: Sun · Moon · Venus · Mars · Jupiter · Saturn · Uranus · Neptune · Pluto
Is your Mercury in the 4th house? Vera reads it with the rest of your chart.
House placements need a birth time. Vera casts your chart from your birth details and reads your Mercury in its real house, sign and aspects.