To determine your 7th house in astrology, you’ll need two pieces of information from your birth chart: your rising sign (ascendant) and the sign that occupies your 7th house cusp. Direct steps:

• Find your rising sign: this is the zodiac sign on the eastern horizon at the exact moment of your birth. If you don’t know it, you can generate a natal chart with your birth date, time, and place from a reputable astrology site or app.
• Identify the 7th house cusp: opposite your rising sign. The 7th house is directly across from the 1st house on the chart.
• Note the sign on the 7th house cusp (the sign that rules the 7th house). That sign’s ruling planet becomes the “lord” of your 7th house.
• Optional deeper layer: see which planet(es) rules or inhabit the 7th house or its ruler in your chart to gain more nuance about relationship themes in your life.

Practical quick reference (sign opposite your rising sign determines the 7th sign):

• If your rising sign is Aries, your 7th house cusp is Libra (ruler Venus).
• If Taurus rising, 7th is Scorpio (ruler Pluto/Mars depending on house system and chart).
• If Gemini rising, 7th is Sagittarius (ruler Jupiter).
• If Cancer rising, 7th is Capricorn (ruler Saturn).
• If Leo rising, 7th is Aquarius (ruler Saturn/Uranus, depending on system).
• If Virgo rising, 7th is Pisces (ruler Jupiter/Neptune).
• If Libra rising, 7th is Aries (ruler Mars).
• If Scorpio rising, 7th is Taurus (ruler Venus).
• If Sagittarius rising, 7th is Gemini (ruler Mercury).
• If Capricorn rising, 7th is Cancer (ruler Moon).
• If Aquarius rising, 7th is Leo (ruler Sun).
• If Pisces rising, 7th is Virgo (ruler Mercury).

What you’ll commonly see:

• The 7th house highlights how you approach committed relationships (romantic, business partnerships, or formal agreements).
• The sign on the 7th house cusp describes the kind of partner you’re typically drawn to or what you value in partnerships.
• The planetary ruler(s) of that sign, and any planets actually placed in the 7th house, add layers about timing, approach, and challenges in relationships.

If you’d like, share your exact birth date, time, and location (or just your rising sign and current known chart details), and I can guide you step-by-step to identify your 7th house sign and its ruler.