According to China's historical book Song Hui Yao, ancient astronomers in China observed a supernova explosion in A.D. 1054. This explosion

Make a circle with the connecting line between the explosion point and the earth as the radius and the earth as the center. Because the opening angle of the projectile is 2.0× 10-6rad every year, the opening angle of the projectile from the explosion point is half, that is, 1.0× 10-6rad, which is a very small arc on the circle, so it can be considered that the trajectory of the projectile is like this.

The calculation formula of speed is speed = distance ÷ time, so the distance and time are calculated separately.

Distance is the short arc mentioned above, and the calculation formula is distance = radius × radian.

So s = r× 1.0× 10-6 rad = 5000 (light years) ×(365×24×60×60)×(3× 10? 8 (light speed) × 1.0× 10-6 rads

Time t=365×24×60×60.

So the speed v=s÷t=5000 (light years) ×(3× 10? 8 (light speed) × 1.0× 10-6 rad = 1500 km per second.

As for the explosion time, it is very simple that 1054-5000 is 3946 BC.