Video: Discoveries that changed the world | the clock

<p style=";text-align:left;direction:ltr">Arab Weather - People knew that time cannot be stopped, and that it is important to know it and use it well, so people have worked hard since ancient times to invent tools for measuring time and calendar, which developed into clocks, and before clocks appeared in their current form, ancient civilizations used different ways to know Time, such as: relying on celestial bodies and other materials, so people used sundials, water clocks, hourglass clocks, candle clocks, incense clocks, mechanical watches with gears and scales, and astronomical clocks</p><p style=";text-align:left;direction:ltr"> the details </p><p style=";text-align:left;direction:ltr"></p><p style=";text-align:left;direction:ltr"><iframe allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen="" frameborder="0" height="315" src="https://www.youtube.com/embed/PAVj1SmgsEY" title="YouTube video player" width="560"></iframe></p>