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Astronomical observation

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Introduction

Astronomical observation

1.Describe the observed motion of the stars during one night.

At first sight stars appear not to move in the sky, they are seen static by human eyes. However recently astronomers have found that the stars are moving at fast velocities through space.

The reason why they appear not to be moving is that they are so far away from us, the closest star is Proxima Centauri, which is 40 million million kilometers far away.

2.

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Middle

The sun is seen to rise higher in the sky in summer than in winter. This occurs because the earth spin is tilted in space. As the earth circles in orbit around the sun during a year, a particular place on the surface is tilted more towards the sun at some times than at others. This brings about the season.

The greatest tilt occur on about June 21 and December 21 every year. On June 21 the Northern Hemisphere

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Conclusion

Their speed vary, but Mercury  is the fastest, followed by Venus, Mars, Jupiter, and then Saturn the slowest one. This motion is called direct motion.

What distinguish the planets from the sun and moon is that they will also sometimes reverse their motion traveling from east to west relative to the stars. This is known as retrograde motion.

Planets move in orbits ruled by the gravity of a bigger mass. However stars don’t move in an orbit they move fast randomly in space.

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Response to the question

The candidate answers the set questions well. The candidate should have answered questions concisely to gain higher marks and show an higher understanding of the science, but their observations are explained very well because they use basic knowledge and ...

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Response to the question

The candidate answers the set questions well. The candidate should have answered questions concisely to gain higher marks and show an higher understanding of the science, but their observations are explained very well because they use basic knowledge and apply physics to it. The candidate clarifies the science well in some parts, but in others some science is not explained quite as well.

Level of analysis

The candidate answers a series of questions. The answer to the first question is quite basic, and could have been cut down into one line to succinctly answer the question. The candidate answers the second question better, but again could have been more concise with the answer. They clearly explain why the sun is observed in certain positions throughout the year well. The candidate answers question 3 well with a series of diagrams to explain what they mean, although the diagrams do not correlate directly with the text. The candidate uses basic science overall but answers the questions well.

Quality of writing

Punctuation, grammar and spelling are all fine. Minor grammatical errors are seen in places. The layout of the text is done well so we know what the candidate is answering clearly.


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