It is known that we are on the earth, and the earth's cycle is 360 degrees, 1 degree =60 minutes.

1 min = 1 nautical mile, 1 nautical mile =1.852km, and the circumference of the earth is:/kloc-0 1.852X360X60=40003.2 The radius of the earth is l/2π = 40003.2/2x3.14 = 6370km,

You can know the size of the earth by sitting at home.

The moon revolves around the earth for about 29.4 days.

The distance between the moon and the earth is 380,000 kilometers.

The weight of the earth can be calculated.