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What is the length of the sun
Yes, the sun's position in the sky affects the length of daylight. The angle at which the sun's rays hit the Earth's surface changes throughout the day due to the Earth's rotation, which in turn affects the length of daylight hours.
I think that the sun doesn't have any length of day, because of the heat and how the planets revolve around the sun.
yes the length of the sun stick does control the distance the shadow moves
The length is called the astronomical unit.
The sun takes zero days to have a full year because the sun does not revolve.
shorter
The Sun is about 800,000 miles (1.3 million kilometers) in diameter.
The position of the sun relates to the length of the shadow cast by an object because, when the sun is above the object there is no shadow yet, when the sun is say to the east of the object a shadow is cast towards the west, the farther the sun for example east the longer the shadow will be towards the west.
True. The length of time that it takes to complete one orbit around the Sun is directly related to the distance of the orbit from the Sun.
I am not sure what you mean by "direct" - light tends to travel in a straight line. The length of the shadow depends on the length of the pole, and of the height of the Sun.
It is about 228 million km.