Ghatika or (Bowl) is a hemispherical vessel made of copper with a small aperture at the bottom so that it sinks into the water 60 times in a day and night.
The clepsydra (Ghatī -yantra) was used in India for astronomical purposes until recent times. The Shloka as in picture is of famous astronomer and mathematician Bharamagupta.The meaning of the shloka is that a Ghatika or (bowl) is a hemispherical vessel made of copper with a small aperture at the bottom so that it sinks into the water 60 times in a day and night. The Ghatiyantra theory interprets that the vessel sinks in 24 Minutes.
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