NADIVALAYA YANTRA: Hemispherical Sundial


This instrument illustrates the plane of the equator and the movement of the Sun north and south of the equator.

The Nadivalaya Yantra consists of two dials that are located parallel to the plane of the Earth's equator. For six months of the year, one side of the instrument is active, and for the other six months of the year, the other side is active. One side will be in sunlight, while the other side will be in shadow, indicating which hemisphere the Sun is in. The changeover time of the shadow from one side to the other takes place on the equinox. Both sides will be in sunlight on the day of the equinox.

The wider grooves/rings in the dial indicate the Zodiac Sign the Sun is in. The innermost rings correspond to the winter and summer solstice. The shadow of the peg indicates the local solar time, and the ring on which the tip of the peg's shadow falls indicates which rising Zodiac Sign the Sun is in. This instrument determines the solar time of day, the rising sign of the Sun, and whether the Sun is north or south of the equator.


Viewing this instrument nullifies any imbalancing influences on the Vata, Pitta, and Kapha situation in the pulse of the individual that may be caused by the movement of the Earth around the Sun and the rotation of the Earth on its axis (season and time of day). The removal of these changing influences on the individual's pulse allows for very precise reading of the pulse by the Ayurvedic physician. This allows the Ayurvedic physician to more accurately detect underlying imbalances in the physiology, resulting in more accurate prescriptions to improve health. The use of this yantra is in offering prevention.


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Nadivalaya Yantra


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