synastry

[si-nas-tree, sin-uh-stree]
noun Astrology.
  1. the comparison of two or more natal charts in order to analyze or forecast the interaction of the individuals involved.

Origin of synastry

1650–60; < Late Latin synastria favorable conjunction of the stars < Late Greek, equivalent to Greek syn- syn- + ástr(on) star + -ía -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Historical Examples of synastry