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On Geometry of Jambūdvipa / 377
the outermost limit of Jambūdvipa might have been shifted 80 Yojanas southward to the parallel of latitude of 230.5 North. But the development of the concept of mandala with the help of gnomonic experiments, the outermost limit of Jambūdvipa had been shifted to 180 Yojanas southward to the parallel of 230.5 North. Probably to cover up the gap between the sequential shifts from 80 Yojanas to 180 or to account for any error in the gnomonic experiments the concept of Jagat might have been evolved which the author is yet investigating. Finally it may be envisaged that Jambūdvipa as implied in the recent model of the concept of solar maşdalas (Sun's diurnal paths) is stretched over northern hemisphere of the earth with its periphery coinciding almost with the parallel of terrestrial latitude of 60.9 North. This study opens many new vistas of research on certain physical theories in Hindu astronomyia and the role of Jainacāryas will be further highlighted.
References
1. See Lishk, S. S. and Sharma, S. D. (1976) Notion of Circular Flat Earth
in Jaina Cosmography. The Jaina Antiquary, Vol. 28, Nos. 1-2, pp 1-5. 2. Jain, L. C. (1958) Tiloya Pannatti kā Ganit (prefixed with Jambudiva
Paņgatti Sarngaho edited by A. N. Upadhye and Hira Lal Jain) pp. 62-64. 3. Lishk, S. S. and Sharma, S. D. (1978) Notion of Obliquity of Ecliptic
implied in the Concept of Mount Meru in Jambūdvipa Prajñapti. Jain
Journal, Vol. 12, No. 3, pp. 79-92. 4. Ibid. 5. Lishk, S. S. and Sharma, S. D. (1975) Latitude of the Moon as Deter
mined in Jaina Astronomy. Shramana, Vol. 27, No. 2, pp. 28-35. 6. Lishk, S. S. and Sharma, S D. (1979) Lengih Units in Jaina Astronomy.
Jain Journal, Vol. 13, No. 4, pp. 143-154. See also Lishk, S. S. and Sharma, S. D. (1975) The Evolution of Measures
in Jaina Astronomy. Tirthankar, Vol. 1, Nos. 7-12, pp. 83-92. 7. See ref. 3. 8. Lishk, S. S. and Sharma, S. D. (1979) Zodiacal Circumference as
Graduated in Jaina Astronomy. Indian Journal of History of Science,
Vol. 14, No. 4, pp. 1-15. 9. Lisbk, S. S. and Sharma, S. D. (1977) Seasons Determination Through
the Science of Sciatherics in Jaina School of Astronomy. Indian Journal of History of Science, Vol. 12, No. 1, pp. 37-44. See also Lisbk, S. S. (1980) Certain peculiarities of Jaina School of Astronomy. Jaina Journal, Vol. 14, No. 3, pp. 81-88. See also Lishk, S. S. and Sharma, S D (1977) Role of pre-Aryabhata I Jaina School of Astronomy in the Development of Siddhāntic Astronomy.
Indian Jourual of History of Science, Vol. 11, No. 2, pp. 106-113. 10. Lishk, S. S. (1983) Notion of Declination implied in the Concept of
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