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As per Vedic astrology, Rahu and Ketu have an orbital cycle of 18 years and are always 180 degrees from each other orbitally (as well as in the birth charts). This coincides with the precessional orbit of moon or the ~18-year rotational cycle of the lunar ascending and descending nodes on the earth's ecliptic plane. Ketu rules the [[Scorpio (astrology)|Scorpio]] zodiac sign together with [[Mangala]] | As per Vedic astrology, Rahu and Ketu have an orbital cycle of 18 years and are always 180 degrees from each other orbitally (as well as in the birth charts). This coincides with the precessional orbit of moon or the ~18-year rotational cycle of the lunar ascending and descending nodes on the earth's ecliptic plane. Ketu rules the [[Scorpio (astrology)|Scorpio]] zodiac sign together with [[Mangala]] | ||
Astronomically, [[Rahu]] and Ketu denote the points of intersection of the paths of the [[Sun]] and the [[Moon]] as they move on the [[celestial sphere]].<ref name=":0">{{Cite book|last=Santhanam|first=R.|url=http://archive.org/details/BPHSEnglish|title=Brihat Parashara Hora Shastra (vol. 1)|pages=24}}</ref> Therefore, Rahu and Ketu are respectively called the north and the south [[lunar node]]s. The fact that [[eclipse]]s occur when the Sun and the Moon are at one of these points gives rise to the understanding of swallowing of the Sun and the Moon by the snake. Ketu is responsible for causing the [[Eclipse of the Moon]].<ref name=":0" /> | Astronomically, [[Rahu]] and Ketu denote the points of intersection of the paths of the [[Sun]] and the [[Moon]] as they move on the [[celestial sphere]], and do not correspond to a physical planet.<ref name=":0">{{Cite book|last=Santhanam|first=R.|url=http://archive.org/details/BPHSEnglish|title=Brihat Parashara Hora Shastra (vol. 1)|pages=24}}</ref> Therefore, Rahu and Ketu are respectively called the north and the south [[lunar node]]s. The fact that [[eclipse]]s occur when the Sun and the Moon are at one of these points gives rise to the understanding of swallowing of the Sun and the Moon by the snake. Ketu is responsible for causing the [[Eclipse of the Moon]].<ref name=":0" /> | ||
==Astrology== | ==Astrology== | ||
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Friends Planets: Ketu is a friend of Mercury, Venus, and Saturn. Jupiter is neutral in friendship. Sun, Moon, and Mars are Ketu's enemies. | Friends Planets: Ketu is a friend of Mercury, Venus, and Saturn. Jupiter is neutral in friendship. Sun, Moon, and Mars are Ketu's enemies. | ||
==Astrology and navagraha worship == | |||
[[Jyotisha]] is Hindu astrology, which entails concept of [[Nakshatra]] (see also [[List of Natchathara temples]]), [[Navagraha]] (see also [[Navagraha temples|List of Navagraha temples]] and [[Saptarishi]] included in the [[list of Hindu deities]] whose [[List of Hindu temples|dedicated temples]] are found at various [[Hindu pilgrimage sites]] to which Hindus take pilgrimage [[yatra]]. | |||
==See also == | |||
* [[Navagraha]] | |||
* [[Nakshatra]] | |||
* [[Jyotisha]] | |||
* [[Saptarishi]] | |||
* [[List of Hindu deities]] | |||
== References == | == References == | ||