Due to some matters at school that need to be handled, I cannot find the time to update the astronomical phenomena forecast. Additionally, due to an accident, the April issue of Amateur Astronomer (Tianwen Aihaozhe) only arrived a few days ago. Since the astronomical information was not timely, there was no time to update it. Therefore, the astronomical phenomena forecast will be suspended this month, and I am making this announcement here. I feel very sorry about this.
I will still try my best to find time to update articles. Here is a preview: the next two articles will be about two very famous problems in celestial mechanics: the “Two Fixed Centers of Gravitation” problem and the “Fixed Gravitational Center + Constant Force” problem. That is, discussing the trajectory of a third mass point under the gravitational attraction of two fixed mass points, as well as the trajectory of a celestial body under the combined action of the gravity of a fixed mass point and a constant force (adding a constant force on the basis of the two-body problem). Both of these problems are exactly integrable, but there is not much information available online or in books.