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The middle image is the same map displayed in a finer scale such that blue corresponds to 2.721 Kelvin and red is 2.729 Kelvin. The "yin-yang" pattern is the dipole that results from the motion of the sun relative to the rest frame of the CMB. |
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An useful orientation in these maps is the ecliptic, that is the apparent path of the sun. If you draw it onto the sky map, the ecliptic will look like a lying S. The maximum and the minimum on that curve the are the equinoxes*. On the days when the sun is on the equinox, there are 12 hours each of daylight and dark. |