【摘要】 时空钟根据地球自转和公转原理。将时空钟、地球仪、晨昏圈等有机地结合起来,成为与自然地球同步运行的模拟地球。更多还原

【Abstract】 Space-time clock combines the clock, globe and circle at dawn and dusk according to the principles of the rotation and revolution of the earth, thus making it a simulated globe which moves in the same way the actual globe moves in orbit.更多还原