Synastry Chart Analysis Tool by Mark Synastry Chart Analysis Tool Enter the birth dates of two individuals to analyze their astrological compatibility. Partner A Day (1-31): Month (1-12): Year (1900-2025): Partner B Day (1-31): Month (1-12): Year (1900-2025): Analyze Compatibility Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on X (Opens in new window) X Like this:Like Loading... Related