Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Speed of Light and Puranic Cosmology   We survey early Indian ideas on the speed of light and the size of the
universe. A context is provided for Sayana's statement (14th century)that the
speed is 2,202 yojanas per half nimesha (186,000 miles per second!). It is
shown how this statement may have emerged from early Puranic notions regarding
the size of the universe. Although this value can only be considered to be an
amazing coincidence, the Puranic cosmology at the basis of this assertion
illuminates many ancient ideas of space and time.

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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-th
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The categories of this paper are: chem-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con