astrophysics

1, the shortest is Sagittarius Palace (not Sagittarius! ), because the earth passed the perihelion at the beginning of 1 month, according to Kepler's second law, the revolution speed is fast at this time, and the sun moves fast on the anniversary day, so the stay time in Sagittarius Palace is the shortest, and the opposite apogee is in the double uterus.

Ps, don't go through that disgusting astrology, it's misplaced. This question is the fourth question of the first IAO, and I answered it.

2, 3 questions personally feel that there is a problem, that month the moon may not be perigee, or it may not be perigee full moon.

4. Sagittarius, with an area of 80 square degrees, the largest is Ophiuchus, with an area of about 1.300 square degrees.

After being reminded by Simoath_ 1 130, correction: the Southern Cross is the smallest 68 square degrees, and Pony is the second to last, 72 square degrees. apology

5. If the Milky Way is simplified as the Silver Road, then in the galactic coordinate system, the North Silver Pole is in the back seat, and the distance from the Silver Road is 90. In spring, the back seat is close to the zenith, so the Silver Road almost coincides with the horizon and the Milky Way is invisible.

By analogy, the position of the silver pole changes with the seasons, and the galaxies you see are different.