फलानि ग्रहचारेण सूचयन्ति मनीषिणः ।
को वक्ता तारतम्यस्य तमेकं वेधसं विना ॥
Palmistry and astrology are linked in a way that the lines on the hand show the planetary positions at the time of birth. Stijn Cuypers in his research finds that the head and heart lines were indeed linked to the position of the Sun and Moon. To explain this, he goes on to study the simian line, which is the “fusion” of the heart-line with the head-line into a single transversal crease across the palm. He provides analysis of charts of those with simian line.