Review Assignment #1 (Chap 1-2)

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Tarrant County College, Fort Worth *

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1345

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Astronomy

Date

Apr 3, 2024

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docx

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2

Uploaded by kkkblack

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Review Assignment #1 (Chap 1-2) [Cycles in the Sky: Crash Course Astronomy #3] The first video describes the motion of stars and planets in the sky as seen from Earth. The Earth takes one year to orbit the Sun. Earth's perspective: distant stars appear to move their positions relative to the sun. This causes the stars to rise and set at different times over the course of the year. The inner planets, Mercury and Venus, move rapidly and can be observed after a single night, while the outer planets are slower but can also be seen to move over time. The video also mentions the tilt of the Earth's axis, which affects the path of the sun across the sky, resulting in differences in daylight hours and seasons. [Moon Phases: Crash Course Astronomy #4] The Moon is the second most obvious object in the sky, behind the Sun. It is a large ball of rock, 3500 kilometers across, that appears bright and silvery to us due to sunlight illuminating it and reflecting down to Earth. The Moon's phase, or the shape it appears to us, changes every day due to its orbit around the Earth. The key factor in determining the Moon's phase is the "terminator," or the line dividing the lit and unlit sides of the Moon. The Moon's orbit around the Earth takes approximately 29.5 days and is tilted relative to the Earth's orbit. This results in the New Moon phase, when the Moon, Sun, and Earth are in a line, and the Moon's dark side is facing Earth. [Eclipses: Crash Course Astronomy #5] An eclipse is a generic term in astronomy for when one object passes into the shadow of another object, darkening or blocking it. A solar eclipse is when the Moon blocks the Sun, casting a shadow on the Earth, and a lunar eclipse is when the Earth blocks the Sun, casting a shadow on the Moon. The Sun and the Moon appear to be the same size in the sky due to a coincidence of time, space, and math.
The Moon orbits the Earth once per month, and the Earth orbits the Sun once per year. Greatest Learning Point: Out of the three videos, I found the greatest learning point to be that it is purely a conscience of time, space, and math that the Sun and the Moon appear to be the same size in the sky from the perspective of someone on Earth. I always subconsciously wondered why it was this way, but always assumed there would be a comprehensive scientific explanation for why it is. Learning that this characteristic is purely a coincidence satisfied an unanswered question whilst providing me with intrigue regarding the subject of astronomy.
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