Grayline An application that can easily be used to calculate the sunrise and sunset.
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sunrise time sunrise sunset sunrise azimuth calculate sunrise sunrise plugin calculate sunset sunrise photo grayline propagation grayline Sunrise Calculator sunrise theme

Grayline Description

Grayline calculates the possible grayline propagation paths for a given day of the year. It calculates your sunrise and sunset time and looks in the DXCC table for countries which are on the opposite grayline. The grayline is a virtual line which divides the earth in the day and the night side. When 1 radiostation is in the dusk and the opposite station is in the dawn, there is a possibility for so called 'grayline propagation'. At sunrise the D-layer builds up slowly and at sunset it disappears slowly again. During this change, low frequencies are not absorbed but refracted by the D-layer and they will enter the F-layer with a much lower wave angle than normal. In this way longer distances can be used for propagation on the lower bands. Grayline propagation occurs in general on the 1.8, 3.5, 7 and 10 MHz bands and the paths will be in the dark.

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