The path of the planets movement is elliptical. Out of the nine planets, five of them are said to have a direct effect on terrestrial events and they are Mercury, Venus, Mars, Jupiter and Saturn. The stone for Rahu is Gomed or Hessonite; a planet considered as the ascending node of the Moon. Rahu generates unnecessary worries and strained relationships and causes unpredictable and sudden changes. Similarly the stone for Kethu is Cat's Eye; a planet considered as the descending node of Moon that influences thinking, asceticism, relationship and wisdom. Cat's Eye is precious gem, which harmonises Kethu.
