Mercury in the 8th House: Meaning by Rising Sign
The short answer
With whole-sign houses, Mercury is in your 8th house when it is in the sign 7 signs on from your rising sign: Mercury in Scorpio for Aries rising, Mercury in Taurus for Libra rising, and so on for all twelve rising signs.
What Mercury in the 8th house means
Mercury describes how you think, talk and make arrangements. In the 8th house of shared money and intimacy, that plays out through joint finances, debt, tax, inheritance, and what you only say in private.
The 8th is a succedent house, the part of the chart concerned with what you build up, keep and rely on. Its natural sign is Scorpio, so Mercury here takes on some of Scorpio's concerns whatever sign it is actually in.
With whole-sign houses, Mercury sits in your 8th house when it is in the sign 7 signs on from your rising sign: for Aries rising that means Mercury in Scorpio. 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 8th house
Find your rising sign in the left column. If your Mercury is in the sign beside it, your Mercury is in the 8th house.
| Your rising sign | Mercury in the 8th house |
|---|---|
| Aries rising | Mercury in Scorpio |
| Taurus rising | Mercury in Sagittarius |
| Gemini rising | Mercury in Capricorn |
| Cancer rising | Mercury in Aquarius |
| Leo rising | Mercury in Pisces |
| Virgo rising | Mercury in Aries |
| Libra rising | Mercury in Taurus |
| Scorpio rising | Mercury in Gemini |
| Sagittarius rising | Mercury in Cancer |
| Capricorn rising | Mercury in Leo |
| Aquarius rising | Mercury in Virgo |
| Pisces rising | Mercury in Libra |
How long a Mercury transit of the 8th house lasts
Mercury stays in one sign for about 36 days on average, so a transit of Mercury through your 8th house lasts about that long: as little as about 14 days and as much as about 2 months across the charted years.
About the 8th house
The 8th house of shared money and intimacy: joint finances, debt, tax, inheritance, and what you only say in private. Its natural sign is Scorpio.
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 4th house · Mercury in the 5th house · Mercury in the 6th house · Mercury in the 7th 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 8th house: Sun · Moon · Venus · Mars · Jupiter · Saturn · Uranus · Neptune · Pluto
Is your Mercury in the 8th 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.