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00:00The most OG clock is the obelisk sundial invented 5,500 years ago. Ancient Egyptians, Greeks, and Romans all used sundials.
00:18The secret is in the shadow or anino. Because of the movement of the sun, in the sky, different times, different positions of the shadow.
00:27They even leveled it up. It has a flat surface that has a mark for each hour.
00:34There are also sundials that can measure even minutes.
00:39But because it depends on the sun, at night or when it's cloudy, it's useless.
00:47That's why inventors are still looking for ways to know what time it is.
00:56iBelievers, you can also watch the full episodes of iBelieve on the GMA Stream and GMA Playground channel on YouTube.
01:03Don't forget to follow and support our exclusive online content on Instagram, X, and TikTok.
01:11We also have that. And remember, if you want to learn, you know where to go.
01:16Next week, let's discover together so you can be smarter.
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