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Analyzing the planet's terminators, or the moving line separating the daylight and nocturnal sides of a given world, the scientists realized that there was tremendous asymmetry.

One of the most disturbing observations for astronomers is the asymmetry between the planet's two terminators.

The first thing to draw in is the terminator line.

As seen from the moon’s surface, anywhere along the terminator, the sun is rising and still low in the lunar sky.

For example, the terminator at the start of Solar Cycle 24 happened later than expected, which allowed for less magnetic field growth during Solar Cycle 24, resulting in a weaker solar maximum.