Shadows change length throughout the day because the angle at which the sun shines on stationary objects changes with the Earth’s rotation. For example, early in the morning, when the sun is near the horizon, it casts long shadows when an object blocks the light. Conversely, when the sun is high overhead during the middle of the day, the shadows become shorter, as the angle of the sun has changed.Know More
The angle at which the sun’s rays strike the Earth changes over the course of the day, but the sun’s position in the sky also varies throughout the year. In the summer, the sun traces a very high arc in the sky, while the winter sun traces a very low arc through the sky, which barely rises above the horizon at extreme latitudes. This change in its path also causes the temperature and day length to change over the course of the year.
The fact that the sun’s position changes over the course of the day, thus causing a change in the shape of the shadows its light creates, is the principle behind a sundial. A sundial uses a central shadow-casting object to cast shadows in a circular pattern that changes throughout the day.Learn more about Our Sun
Because the sun is not a planet, a solar day is undefined. The definition of a solar day is the amount of time it takes for a planet to rotate on its axis before the sun returns to the same spot in the sky.Full Answer >
Day and night on Earth are caused by the planet's rotation around its axis and its position relative to the Sun. The Earth rotates from west to east, so places further east experience daybreak and nightfall sooner. One hemisphere of Earth is in daylight at any given time.Full Answer >
The Sun appears to move across the sky during the day due to the rotation of Earth along its axis. Because Earth rotates from east to west, the Sun first appears on the eastern horizon and then moves westward across the sky until it falls below the western horizon.Full Answer >
"Cot" is the abbreviation for "cotangent," a trigonometric function used to find the value of an angle in a right triangle by dividing the length of an adjacent side by the length of the opposite side. The numerical value of cot x varies depending on the value of x.Full Answer >