Ardra

Ardra is the sixth nakshatra, from 66 degrees 40 minutes to 80 degrees of the sidereal zodiac in Gemini, in the region of the bright star Betelgeuse. Its Vimshottari ruler is Rahu, the Moon's ascending node; its presiding deity is Rudra, the storm-god and fierce form of Shiva; and its symbol is a teardrop or, in some lists, a diamond. The name means moist or wet. Jyotisha reads Ardra through Rudra's storm energy, upheaval, destruction that clears the ground, the tear that both grieves and renews, and classes it as Manushya gana. It is treated as one of the more turbulent mansions, the fresh cleansing of the storm following the seeking of Mrigashira. These attributions are traditional; the associated star, Betelgeuse, is the red supergiant marking Orion's shoulder.

Ardra's padas run through Cancer, Leo, Virgo and Libra. Betelgeuse is a red supergiant near the end of its life, and modern astronomers regard it as a plausible candidate to become visible as a supernova on a human timescale, though the event could still be a hundred thousand years off; this astrophysical instability has no bearing on the classical Rudra attribution but sits suggestively alongside a mansion already read as stormy and destructive. Ardra is also one of three nakshatras, together with Swati and Shatabhisha, ruled by Rahu in the Vimshottari sequence, and jyotisha commonly treats all three as sharing a note of the unconventional and the disruptive that follows the shadow planet's rulership regardless of the mansion's own separate deity and symbol.

A nakshatra spans thirteen degrees twenty minutes, which is a wide gate. The four padas that quarter it are what make the division precise enough to be worked with. Ardra runs from 66 degrees 40 minutes to 80 degrees 00 minutes of the sidereal circle, and its four padas are three degrees twenty minutes each: the first from 6 degrees 40 minutes of Gemini, the second from 10 degrees 00 minutes of Gemini, the third from 13 degrees 20 minutes of Gemini and the fourth from 16 degrees 40 minutes of Gemini. The Moon crosses a single pada in roughly six hours, so a birth an afternoon apart can fall in two of them.

The arithmetic hides a coincidence that is not one. Twenty seven nakshatras of four padas make one hundred and eight divisions of the zodiac, and the navamsha, the ninth-part chart that jyotisha treats as the most important of all the divisional charts, also cuts the circle into one hundred and eight. They are the same cut. A pada is a navamsha, and naming the pada names the navamsha sign without any further calculation. The four padas of Ardra fall in Sagittarius, Capricorn, Aquarius and Pisces in that order.

Two cautions attach to those degrees. They are sidereal, measured from a fixed point among the stars rather than from the equinox, so they depend on the ayanamsha chosen to locate that point; the Lahiri, Raman and Krishnamurti values differ by up to about a degree, which is a fifth of a pada and enough to move a chart across a boundary. And the equal arcs are a scheme laid over the sky rather than a description of it: the star the nakshatra is named for sits somewhere inside its arc rather than filling it, and for several nakshatras that identification is itself disputed.