Which of the following describes the position of Polaris in our local sky here in the bay area?

Question

BlackTom AI · Accepted Answer

First, recall what Polaris' sky position represents: Polaris is located nearly at the celestial north pole, so its declination is around +90 degrees. For a given observer, the altitude of Polaris above the northern horizon roughly equals the observer's latitude.

Option 1: 90° altitude, 38° declination. This would place Polaris directly overhead (zenith) and have a declination near the observer's latitude, which is inconsistent with Polaris being near the north celestial pole. Therefore this is incorrect.

Option 2: 90° altitude, 0° declination. A 90° altitude implies the object is at the zenith, but a declination of 0° would place it on the celestial equator. Polaris is not on the celestial equator, so this option is wrong.

Option 3: 38° altitude, 90° declination. This matches the expectation for a Bay Area observer at roughly 38° N: altitude of Polaris around the latitude (about 38° above the horizon) and a declination of +90° since Polaris sits near the north celestial pole.

Option 4: 38° altitude, 0° declination. An altitude of 38° is plausible, but a declination of 0° places the object on the celestial equator, not near the north celestial pole. This contradicts Polaris’ true position.

In summary, only the combination of an altitude equal to the observer’s latitude (≈38°) and a declination of about +90° accurately describes Polaris as seen from the Bay Area, while the other options mix incorrect altitude/declaration pairings that do not align with Polaris’ well-known location near the north celestial pole.

ASTR-1-45046-F25 Lecture: Sky Navigation

Which of the following describes the position of Polaris in our local sky here in the bay area?

查看解析

登录即可查看完整答案

类似问题

Which of the angles in the previous question would be different when viewed from the North Pole?

Right ascension and declination in the celestial sphere correspond to

The equinoxes are located at the intersections of the

In a consumer society, many adults channel creativity into buying things

Economic stress and unpredictable times have resulted in a booming industry for self-help products

People born without creativity never can develop it

A product has a selling price of $20, a contribution margin ratio of 40% and fixed cost of $120,000. To make a profit of $30,000. The number of units that must be sold is: Type the number without $ and a comma. Eg: 20000

Which of the following statement regarding cost is correct:

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单