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historical period and place. Thus they seem to be adding to one difficulty in the process of standardisation and he has conveyed that the value of st- andard basic angula is variable, that is, it is a secondary standard rather than primary as desired by canons. One would like to wonder how a variable quantity may be treated as standard. Moreover, the authors of ADS, B, TP, JDP and SK belong to the same side of the country and there should not be any variation in their descriptions. On the other hand, Akalanka and others originate from south and there should not be variations in the measures. But we see variations not only in both the groups, but in the same group also. One has to look as to the when and how of this variation. . Leagth Unlts Smaller Than Augula
The length units based on UA are known as utsedha measures representing their division-based cate- gory. The smallest unit of the cate- gory is atom. As this is very fine, there is another practical uuit known as 'practical atom.' When we interpolate the UA units towards smaller nnits, we reach the point of practi. cal atom. Though the JDP mentions Trutirenu (urdhvarenu of ADS) as praɔtical atom, the ADS points it to be a much smaller unit (8_12400) The real preactical unit is an infinite multiple of this unit which has the same name in ADS and B, but Table
V shows that its name is different in TP, RV and JDP. The same is the position of the second unit eight times larger. These two units should have uniform names in current times The cause of the different names should also be looked into.
It is seen that there are 13 stages of smaller units upto UA in ADS while there are 12 stages in other treatises including Bhagavati. The how and when of this change req. uires further consideration. Is It the mistake of the copyist?
Besides the above two differences, B 7100BC) and RV (650AD) have same names of other ten units upto angula. In contrast, there is similarity in names in TP and JDP (names of hair heads and yava or yavamadhya). This difference should also be looked into and formalised for the current age.
It is clear from Table y that each of the 12 stages from angula backwards in eighth part of the preceding unit. The first unit, thus has a value of 1.6x10-10A. If we multiply this value by its om-equivalent of 1.70, the first unit has a value of 2.72x10–10cm. If one takes JDP as a little more practical, and the practical atom or trutirenu is taken as 8x8=64 times the first unit, the practical atom has a dimension of 1.75x10-8 cm. which is the size of the current scientific atom, This
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