My latitude is between 24 and 30 degrees north latitude. Why do you always see the sky with many stars in the south and few stars in the north at night?

Interesting question, try to make a small discussion here.

Suppose the landlord is located at 30 north latitude, and the observation time is 2 1 on May 24th, when he is officially in the spring starry sky.

The range of the southern sky is: declination-30-+30 (below 30, it will be strongly interfered by the atmosphere and ground light), when right ascension10-16 (due south 45, otherwise it will be counted as the eastern and western sky).

The range of the northern starry sky is: declination+30-+90, right ascension 8-19 (near the north celestial pole, the range of right ascension is correspondingly larger).

A rough range, although not necessarily completely accurate, is at least close.

Let's start from the southern sky and see that the constellations and bright stars above level 3 are all within the range:

Leo: Two first-class stars (Mars, Xuanyuan XIV), two second-class stars 1 star (Diyi) and four third-class stars (Xuanyuan VIII, algie Ba). Note: Xuanyuan Eight is slightly out of range and is still included.

Rear seat: None.

Capricorn: One first-class star (big horn) and two third-class stars (one stalk and one right).

North corona: a second-class star (Guansuo IV)

Sextant seat: None.

Dajue: Nothing.

Raven constellation: four third-class stars (four Pleiades).

Virgo: Two first-class stars (Saturn, arcturus I) and three third-class stars (arcturus II, East Second Commander, East Upper Phase).

Ophiuchus (head): third-class star (Shu).

Libra: a third-class star (zubenelgenubi, four, seven fold).

Ophiuchus: a second-order star (Star One) and three third-order stars (Flat Star, Ophiuchus V). Note: Constellation 1 is slightly out of range and still included. The Chinese name of Ophiuchus V is unknown.

Ophiuchus: Two third-class stars (Liang and Chu).

Scorpio: a third-class star (rooms 1, 2 and 3). Note: The five stars selected by Snake Man and Scorpio are slightly out of range and included.

Be a total: first-class star: 4. Second-class star: 3. Third star: 24.

Look at the northern sky again:

Tmall: a third-rate star (Xuanyuan IV).

Ursa major: There are six secondary stars (Shu Tian, Tian Xuan, Tianji, Yuheng, Kaiyang, Yaoguang and Beidou) and six tertiary stars (Wenchang IV, Neijie I, Shangtaiyi, Zhongtaiyi, Taizun and Tianquan).

Leo: No.

Dog: a third-class star (Koo Karoli).

Capricorn: a third-class star (ostentatious).

Five immortals: two third-rate stars (cat 2, female @ bed 1)

Dragon constellation: second-class star (Tiansi) 1 star, and third-class star (Tiansan, Tianchu I, Shangbi, Shaozai and Zuo Shu) with 5 stars.

Leopard: No.

Ursa minor: two second-class stars (Emperor and GouChen Yi) and one third-class star (Prince).

Make a statistic: first-class star: 0, second-class star: 9, third-class star: 17.

The above statistics are controversial. For example, some celestial bodies close to+30 declination but far away from 13h declination should be excluded from the southern starry sky. However, some celestial bodies close to 30 declination but exceeding 16h declination should be excluded from the northern starry sky. Secondly, the brightness of the stars. I use a six-level all-sky star map that can be downloaded from the Internet, which is more intuitive, but the brightness of some stars will change because of errors such as 0.0X. But they are all boundary effects, the influence will be small, and there is no deliberate deviation in sampling, so the error introduced will not be too great.

Compare the number of bright stars between north and south:

Just compare the first-class stars: 4-0 in the south, a complete victory.

Compared with the second-class bright star: 7:9 in the south, slightly inferior, mainly thanks to the Big Dipper.

Compared with the bright star above the third class: 3 1:26, the south is slightly better.

Personally, there are two main reasons why the southern starry sky is more remarkable:

1. Close to the ecliptic, because it is close to the ecliptic, it is possible for the five elements to enter this range. Now Saturn and Mars are undoubtedly the two most prominent celestial bodies in the spring sky. In contrast, there is no such good opportunity in the northern sky.

2. Close to the Milky Way, the stars near the Milky Way are relatively dense, and the density of stars is several times that near the Silver Pole. Therefore, in the case that the number of second-class stars is dominant and inferior, the South has completed overtaking the third-class stars. If I slightly expand the sampling range, the bright constellations Centauri, Jin Roh: The Wolf Brigade, Ophiuchus (there are two stars in the far west) and Scorpio will be added to the southern sky. The reserve forces in the northern sky, Wuxian (East), Lubao (Most), Tmall (Most), Cepheus (North) and Cygnus (Northwest) will be much inferior, so the contrast will be more obvious.

Observations on evaluating the landlord;

1. The observation of the landlord is basically accurate. On a spring night, the stars in the southern sky are really unnecessary in the north.

2. The observation of the landlord added subjective factors. Although the starry sky in the north is not worse than that in the south, it is by no means dim, especially the famous Big Dipper.

3. The landlord's observation conclusion only applies to spring. The north and the south win glory in summer, the north is better than the south in autumn, and the south is slightly better than the north in winter. Different conclusions in different seasons are caused by the location of the Milky Way.