Complex sentence: A yod is a rare astrological aspect involving any celestial body three (or more) plants or points where two planets are sextile (60 ° aspect) to each other, and both are quincunx (150 ° aspect) to a third.
Split into simpler sentences: A yod is a rare astrological aspect involving any celestial body three (or more) plants or point. This occurs when two planets are sextile (60 ° aspect) to each other, and both are then quincunx (150 ° aspect) to a third.