Enter Synastry Data
Enter zodiac degrees from 0 to 359.99. Use degrees from each natal chart.
Example Data Table
| Input | Person One | Person Two | Meaning |
|---|---|---|---|
| Sun Degree | 14.20 | 136.40 | Identity and life direction |
| Moon Degree | 48.75 | 16.90 | Feelings and emotional pattern |
| Venus Degree | 101.60 | 282.30 | Love style and attraction |
| Ascendant Degree | 72.00 | 250.00 | First impression and overlay base |
Formula Used
Angular difference: d = min(|A - B|, 360 - |A - B|)
Aspect match: an aspect is counted when |d - aspect angle| is less than or equal to the selected orb.
Tightness: tightness = (orb - aspect error) / orb
Aspect points: aspect score × average planet weight × (0.35 + 0.65 × tightness)
Final score: clamp(50 + (positive points - challenge points) / 3 + overlay boost / 3, 0, 100)
How To Use This Calculator
- Get both natal chart planetary degrees from a trusted chart source.
- Enter each planet degree between 0 and 359.99.
- Use a 4 to 8 degree orb for common synastry checks.
- Press Calculate Synastry to view the score above the form.
- Review the strongest aspects and house overlays.
- Use CSV or PDF export to save the report.
Understanding Synastry Results
Synastry compares two natal charts. It does not judge a bond. It studies how one person stimulates another. This calculator uses planetary degrees, aspect orbs, and house overlays. The aim is a clear relationship snapshot.
Why Aspects Matter
Aspects are angular links between two charts. A trine often feels easy. A sextile may show support. A square can create pressure. An opposition can bring attraction and tension. A conjunction feels strong, yet its meaning depends on the planets involved. Close aspects receive more weight because the contact is more exact.
Personal Planets
The Sun, Moon, Mercury, Venus, Mars, and Ascendant carry extra value. They describe identity, feelings, speech, love style, desire, and first reaction. When these points connect, people usually notice the chemistry quickly. Outer planets can matter too, but they often describe slower themes.
House Overlay Meaning
House overlays show where one chart lands in another chart. A seventh house overlay can feel partnership focused. A fifth house overlay may feel playful. An eighth house overlay can feel intense. An eleventh house overlay may support friendship and shared hopes. This tool uses equal houses from each Ascendant, so the overlay is simple and readable.
Reading The Score
The score is not a promise. It is a guide. High harmony can still need effort. Strong challenge can create growth when both people communicate well. The best use is comparison. Change the orb, review exact aspects, and notice repeated patterns.
Practical Use
Enter accurate degrees from a natal chart source. Use decimal degrees from zero to three hundred sixty. Set a wider orb for a broad overview. Set a smaller orb for serious matching. Review the strongest aspects first. Then study house overlays. Export the report if you want to compare different birth times or save notes.
Healthy Perspective
Astrology works best as reflection. It should not replace trust, consent, or real conversation. Use the result to ask better questions. Notice where support is easy. Notice where patience is needed. A balanced reading respects both people and leaves room for choice.
Save several versions when birth time is uncertain. Small Ascendant changes can move overlays, but exact planet aspects usually remain useful. Keep later reviews organized and focused.
FAQs
1. What is a synastry chart?
A synastry chart compares two natal charts. It studies aspects, overlays, and repeated themes between two people.
2. Does this tool create natal planet positions?
No. Enter planetary degrees from a natal chart source. This tool compares those degrees and calculates relationship patterns.
3. What orb should I use?
Use 4 degrees for strict matching. Use 6 degrees for normal reading. Use 8 degrees for a wider overview.
4. Is a high score always good?
No. A high score shows easier flow. Real relationships still need respect, timing, honesty, and communication.
5. Why are squares counted as challenges?
Squares often show friction, effort, and growth lessons. They can create attraction, but they usually need patience.
6. What does house overlay mean?
House overlay shows where one person’s planets fall in the other person’s chart. It describes life areas activated.
7. Can I download the result?
Yes. Use the CSV button for spreadsheet data. Use the PDF button after calculation for a simple report.
8. Is this relationship advice?
No. This is an astrology study tool. Do not use it as a replacement for personal judgment or communication.