[INDOLOGY] Unit of time in premodern Indian system of time units.

[Harry Spier]

Dear list members,
I've been asked to confirm the meaning of *kalā* in the premodern  Indian
system of time units.
 According this wikipedia page
https://en.wikipedia.org/wiki/Hindu_units_of_time
 referring to the  Sūrya Siddhānta, 1 kalā = 30 kāṣṭhā approximately equal
to 48 seconds but I've also been told that 1 kalā  is about one hour of the
western time units. Can someone confirm the meaning of  kalā in the Indian
system of time units . Was there more than one system of time units in
general use in premodern India?
Thanks,
Harry Spier
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