43. As shown in the figure, two satellites $\mathrm{A}, \mathrm{B}$ are both orbiting the Earth's center in a counterclockwise direction at constant speeds. It is known that the time ratio for $\mathrm{A}$ and $\mathrm{B}$ to complete one orbit is 1:5. Starting from the positions shown in the figure, during the time it takes for $\mathrm{B}$ to complete one orbit, satellites $\mathrm{A}$ and $\mathrm{B}$ and the Earth's center are collinear $\qquad$ times.
Reference answer: 8