A sundial is a device which tracks the movement of the sun and translates it into the time of day. it does this by casting a shadow onto different markers which designate the different hours. Sundials must be aligned with the axis of the earth’s rotation to tell the time.
Interesting asides, the leaves and buds of young sunflowers track the path of the sun during the day ( a phenomena known as heliotropism). Honey bees always knows which direction the sun is, even at night.
In most technologies, a solar tracker measure the angles of incidence between sunlight and a given surface to figure out exactly where the sun is at. Solar panels, for example, use this technology to face the sun and therefore maximize their energy output.
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