Do you know how the clock time was determined earlier?Watch time set?

Do you know how the clock time was determined earlier?
क्या आप जानते हैं कि घड़ी का समय पहले कैसे निर्धारित किया गया था?
প্ৰথমে ঘড়ীত কেনেকৈ Time set কৰিছিল !
প্ৰথম ঘড়ীতো কেনেকুৱা আছিল জাননে ?

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