Rahu

Rahu is not a planet but a node: it is recorded in points.json as a lunar_node, and this entry does not force a planet id on it (the same convention nakshatras.json uses, where the nodes get ruler_name rather than ruler). It owns no sign, has no weekday in the seven-day week, and is always retrograde; its moolatrikona is undefined. Its exaltation is disputed - BPHS says plainly that on the exaltation of the nodes 'there are different views' - and Taurus (with Gemini as the common variant) is given here for exaltation and Scorpio (with Sagittarius as the variant) for debilitation. BPHS makes it a friend of Jupiter, Venus and Saturn, an enemy of the Sun, Moon and Mars, and neutral to Mercury. The Western files read the nodes psychologically as the North and South Nodes and give them no dasha, gem or deity; Jyotish treats them as full grahas with all of these.

Rahu and Ketu are the lunar nodes, not planets; in Vedic astrology they are the eclipse-demons and the karmic axis. Western astrology calls them the North and South Nodes and reads them psychologically.