The 4D Ionosphere is something that will give you hours of fun:
Today, NASA-funded researchers released to the general public a new "4D" live model of Earth’s ionosphere. Without leaving home, anyone can fly through the layer of ionized gas that encircles Earth at the edge of space itself. All that’s required is a connection to [...]
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One of the great challenges in contesting is knowing what band to be on at what time to maximize rate and multipliers (which are not necessarily the same band). And the most challenging time to figure out which band to be on is at sunrise and sunset — the greyline.
For example, at sunrise, the greyline [...]
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