20 13 Guangdong astronomy competition is urgent!

A. Close to Scorpio and Libra B. In Virgo

C. Cancer, Gemini and Pisces

The landlord didn't give an important message, the exam time! I can't do so many questions. So put the second question first. According to the answer, the sun should be a light snow solar term near Scorpio Libra, meaning 1 1 late month. Ok, let's look at other topics.

40. The following statement is wrong (b)

A. Jupiter can be seen in the eastern sky soon after sunset. You can see the complete Big Dipper in the middle of the night.

C.venus is the morning star. You can see arcturus before sunrise.

A.20 13 Jupiter is located in Gemini, near the summer solstice. The sun is about 30 degrees from the winter solstice, and it does rise in the east soon after sunset.

B Guangdong Province is relatively south, the Big Dipper is quite far from the Constant Circle, and the Right ascension of the Big Dipper spans the whole spring. In other words, the rise of the last shining star is estimated to wait until two or three in the morning. Mistake.

C. I will not go backwards on the issue of aging. Venus is the morning star and the evening star. Just pay more attention. For example, at present, Venus is a dark star, which has just passed the conjunction and started a new cycle.

D arcturus's Right ascension is close to Kangsu, located to the west of the border, with a northerly latitude, which is enough to rise to a higher height before sunrise.

42. Which of the following is not suitable as the theme (c) of the evening?

A. Pleiades cluster B.M3 1 Andromeda galaxy

C. Scorpio M4 globular cluster D. M35 Gemini open cluster

Anyway, where is the sun and where the celestial bodies are invisible, naturally there is no need to talk about subsequent observation and shooting.

43. In Guangdong, when the center of Pisces is at midnight (C)

A. Typhoons often come

B.the plum rain is not over yet

C. Day and night are basically divided equally

D. People in the street wear winter clothes.

Between the autumnal equinox and the National Day, although the typhoon season has not yet ended, with the development of Mongolian high pressure, the probability of landing in Guangdong is already very low. Plum rains in Lingnan are in March and April (please remember Han Hai). Anyway, it must have nothing to do with autumn. The last point can be said if it is in the northeast, but in my impression as a Shanghainese, Guangdong's winter clothes are not winter clothes either ~

Considering the influence of atmospheric extinction, we hope to observe as much as possible when the celestial horizon is high. In Guangzhou, one night from 9: 00, Xiaoming will observe four celestial bodies, A, B, C and D, each for 30 minutes. At nine o'clock, A is located in the west-southwest direction, with a horizon of about 30 degrees, and B is located in the east-southeast direction, with a horizon of 40 degrees. C and D are located in the north, and the horizon is 15 degrees and 70 degrees respectively. The most reasonable observation order is the following (d).

A C，B，A，D B D，C，A，B C，A，D，D，B，C。

Tip: Note that the horizon of Polaris in Guangzhou is about 23 degrees, so C and D are located in the lower and upper transit respectively, and the horizon of C will increase continuously, so it is better to observe C at last. A's horizon is getting smaller and smaller, while B's horizon will continue to increase. So you can observe the armor first. D is the most reasonable

If you don't explain, look at A first, otherwise it will fall soon. Only by relying on this can you choose the correct answer. B doesn't worry, anyway, it hangs in the east, just wait for it to rise slowly (proving A's mistake again). Ding, hurry up, it's already zenith, and the altitude angle will slowly drop. All three are easy to understand, right?

There may be something wrong with C. Remember, the geographical latitude of Guangdong is about 24, and this star is located in the north, with an altitude angle of only15. What information can be deduced? The declination is +8 1, and it goes down to the sky. So just wait. 12 hours later, the altitude angle of the upper transit reaches 33.

Can we get the sequence now? a，D，B，c。