Calculate the synastry of two charts
Enter the birth date, time and place of two people. We show the aspects formed between their planets, from the most exact to the widest.
How we calculate it
Synastry compares two birth charts. We calculate each person's planet positions and measure the distance between every planet of one chart and every planet of the other.
An aspect appears when that distance is close to an exact angle: conjunction (0°), sextile (60°), square (90°), trine (120°) or opposition (180°). The orb is how many degrees are left to the exact angle, and the smaller it is, the stronger the aspect is considered.
Without a birth time we calculate the planets at noon and leave out the rising sign and houses. The Moon travels about 13 degrees a day, so its aspects are approximate.