After autumn, the shining summer triangle ( Altair, Vega and Tianjin 4) is located near the zenith after sundown. At 20 o'clock in the evening, the Milky Way is located near the zenith of Scorpio in the south, south, and west. The summer triangle that crosses the zenith extends to Cassiopeia in the north and north east; Jupiter and Saturn are also juxtaposed in the southeast sky at this time, making the colorful summer night sky more visible. The indicator of the autumn starry sky- The autumn quadrangle is already located in the eastern sky.
2021/9/5 Venus conjoins Spica ★
In the early evening of September, in the low south west of the evening, the bright Venus and Virgo are very close to the first magnitude star. The closest approach is around September 5th, and it will approach less than two degrees. Venus is very bright (-4.1 magnitude) and is easy to find. Although Spica is a first-magnitude star, it is still in the twilight, and the naked eye may not be able to find it. From the 2nd to the 9th, you can use binoculars to see in the same field of view.
2021/9/10 Venus conjoined the moon ★★
September 10th 10:09 Venus conjoined the moon at the center of the moon at the 13th of Venus at right angle 13 The place at 4.08 degrees to the south is not timeless and cannot be viewed. It can be viewed at low altitude towards the west in the evening, the brightness of Venus is -4.1,The moon is a crescent moon with an age of 3.7, like a crooked silver hook. The Venus conjunctive moon is the most striking of the planetary conjunctive moons. As long as there is no place where there are too high buildings, mountains or trees to cover the western horizon, you can enjoy the beautiful view of Venus and the prosperous moon. The next time Venus conjoins the moon is October 10.
2021/9/11 wisdom star opposing ★
September 11th 09:48 Mind of Mind and the Sun of the Mind and Sun The difference is 180 degrees, the distance from the earth is 2.14 astronomical units, and the apparent brightness is 8.5. At 07:09 on September 16, Sophyllum was closest to the earth, 2.14 astronomical units, with an apparent brightness of 8.6. The evenings of the next few weeks are the best time to observe the asteroid No. 2 Zhisheng. Nevertheless, even at its brightest time, Zhisheng is a celestial body invisible to the naked eye, and it can only be observed with the small or medium-sized telescope .
2021/9/14 Mercury east distance
September 14th at 12:24 pm Mercury east distance, day distance angle 26.8 degrees, apparent brightness 7.0″ 0.1, etc. , At dusk in the west at low altitude. But the conditions are not good this time because it is almost close to the horizon. Although Mercury has a brightness of 0.1 grade, it may be difficult to observe with the naked eye due to the influence of twilight.
2021/9/14 Neptune opposition ★
At 17:21 on September 14, Neptune opposition,Neptune seen in the center of the earth differs from the Sun's yellow longitude by 180 degrees. The distance is 28.9167 astronomical units from the earth. It is located in Aquarius , with an apparent diameter of 2.4 arcseconds, and 's apparent magnitude +7.8. Because the apparent magnitude is relatively dark, a telescope or long-term photographic comparison is required.
Neptune means Poseidon in Roman mythology. It is a planet that was discovered by a telescope after calculating its position through mathematics in 1846. With a diameter of 49,532 kilometers, it is about four times larger than the Earth and the fourth largest planet in the solar system. The revolution period is 163.7 earth years, and the rotation period is about 16 hours.
2021/9/17 Saturn conjunct the moon ★★
At 10:33 on September 17, Saturn will see Saturn conjunct the moon at 6 degrees north of the moon at 10:33. But the time is daylight and it is impossible to watch. It can be viewed from the evening of the 17th to the early morning of the 18th. On the right side of the moon is Saturn, which has a brightness of 0.4 and is pale yellow; on the left is Jupiter, which has a brightness of -2.8 and is white. Looking south at around 21:00, the distance between Saturn and the moon is 6.7 degrees, the distance between Jupiter and the moon is 12.5 degrees, and the distance between Jupiter and Saturn is 16.5 degrees. The three lie close to each other in Capricorn, presenting a wonderful scene of " double star with moon " to the public.
2021/9/18 Jupiter conjunct the moon ★★
September 18, where Jupiter conjunct Jupiter will see Jupiter 6 degrees north of the moon at 14:50. Look towards the south at around 21 o'clock,Jupiter is located on the upper right side of the moon, and the distance has been extended to 5 degrees. The astronomical telescope can also observe Jupiter stripes and Galileo satellites. Saturn can also be seen a little further away. The next time Jupiter conjoins the moon on October 15.
2021/9/20 Mars is the farthest from the earth☆
At 19:46 on September 20, 2021, Mars is the farthest from the earth, with a distance of 238,694.15 million astronomical units from the center of the earth. 6371 kilometers. On this day, the earth and Mars are on both sides of the sun, and Mars is the farthest from the earth in an elliptical orbit. Although it is not as far as the farthest distance on August 29, 2019 (2.675335 astronomical units, 400.22 million 4435 kilometers), it is still far. To reach the same distance in the future, we have to wait until 2066. Mars will be closest to Earth on December 1, 2022.
2021/9/21 Mid-Autumn Moon Watching ), coincides with Wang (full moon), the time of watching the moon is 7:55 on September 21, the distance from the earth is 389,988.036 kilometers, and the apparent diameter is 30.6 arc minutes. On the day when the full moon is in the sky, it is also a beautiful festival for people to reunite.
2021/9/23 autumnal equinox★
The autumnal equinox at 03:21 on September 23, the sun crosses the equator and enters the southern hemisphere at 180°. Autumnal equinox).After the autumnal equinox, the direct sun point continues to shift from the equator to the southern hemisphere, and the days in the northern hemisphere begin to be shorter and longer nights, that is, the daylight starts to be shorter than the night time in a day.
2021/9/27 Bisu five months ★
September 27 at 06:54. Bisu five months, Bisuwu is 6.20 degrees south of the moon. Aldebaran is the brightest star in Taurus and can be seen near the zenith of before dawn.
