Precision without breadth: one tight square and little else
Low in the range for contact across 93 pairs charted (29–86, median 41).
Katy Perry and Taylor Swift compatibility
↓ Below: all 3 aspects named, with orbs
Sources conflict on the birth time. No recorded verification, so houses and the rising sign are not shown.
Note on this rating: Birth time 08:36, Rodden DD (conflicting sources) via astrotheme.com, crediting Lois Rodden / Astro-Databank.
This page compares Sun, Mercury, Venus and Mars, the four placements a birth date alone can place. Moon, Ascendant and Midheaven are left out here by design, not by omission, so nothing on this page is scored against a birth time it cannot trust.
Cross-aspects
Where the two charts actually touch
Category shape
Five categories, one chart each
Communication
MERCURY × MERCURY
talks in sync, from Katy Perry's Mercury sextile Taylor Swift's Mercury
25
Identity
SUN × SUN
No aspect inside orb. Their core identities read independently of each other here.
None
Attraction
VENUS × MARS
No aspect inside orb. Neither Venus reaches the other's Mars within orb.
None
Friction
MARS × MARS
No aspect inside orb. No built-in friction point shows up between the two Mars placements.
None
Values
VENUS × VENUS
No aspect inside orb. Their values neither align nor clash by this measure.
None
Scores rank how close a contact is to exact, not how well two people get along. A high friction score means the two Mars are in tight aspect, which is information, not a warning.
The overlap
Two charts, laid over each other
Katy Perry and Taylor Swift's Sun, Mercury, Venus and Mars are drawn here, the four placements a birth date alone can place with no birth time required. This is a complete chart of what is known, not a partial chart of what is not.
| Thick line, Sun to Venus | SQUARE 0.57° |
| Thin line, Mercury to Mercury | SEXTILE 3.46° |
| House ring, not drawn | |
Why they click
Mercury sextiles Mercury at 3.46 degrees and Mars conjoins Mercury at 5.88. Both are wide, and both are the only supportive structure available. Communication reads 25, which sits below the engine's no-contact floor even though a real Mercury contact is present.
Why they clash
Sun squares Venus at 0.57 degrees, the tightest contact in the synastry and the one hard angle in it. Three contacts total and an overall reading of 29, which sits below the floor of 30 that the engine returns when it detects nothing at all. What it finds here is precision without breadth.
What each system says
Twelve systems, two people
The Suns are 49.2° apart, outside orb of any aspect, which is why identity reads as an empty channel above.
Rat and Snake are in neither the trines nor the clashes.
Frequently asked
Are Katy Perry and Taylor Swift astrologically compatible?
Their charts make 3 cross-aspects, the tightest at 0.57° and 3.46°. Astrology does not score a relationship out of a hundred, and the number on this page counts how much contact two charts make, not how well two people do.
Why isn't there a house ring on the chart above?
At least one of Katy Perry and Taylor Swift doesn't have a curated, non-estimated birth time, so a house placement would be a guess. This page only shows what a birth date alone can place.
What does square mean between two charts?
A square puts two placements at a right angle, generating friction that tends to force action. Katy Perry and Taylor Swift have one square between them.
Tight contact, mixed valence
Run the full synastry
This page compares Sun, Mercury, Venus and Mars, because those are the four that a birth date alone can place. The synastry calculator runs all ten bodies against each other.