Synastry is the comparison of two people's natal charts to determine compatibility. It is based on a variety of factors, including aspects between planets and points in each person‣s chart. A good score in synastry would depend on the individual preferences and goals of the couple being evaluated. Generally speaking, a high overall score with strong connections between personal planets (Sun, Moon, Mercury, Venus and Mars) can indicate a strong connection that could lead to lasting love. However, it‣s important to remember that no single number or aspect can guarantee success in any relationship – ultimately it comes down to communication and effort from both parties.