There are only two times in the year when you will see the grey line running straight down the map on DX Atlas from north to south - the equinoxes. DX Atlas is a great little program for helping you find beam headings to various DXCC, and also for looking up DXCC prefixes. It's widely used by many dxers. I took this screen shot yesterday, on the Spring Equinox. This is the time when the sun is located on the celestial equator and day and night are of equal length.
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