Travelers need a map when driving to unfamiliar destinations whether they’re going to the other side of town or across the country. The map is a model of the real world and knowing how to navigate ...

How much of the sky can you see at any one time? This, of course, assumes you are looking up from a wide-open, flat field or out on an ocean liner with nothing but a flat horizon no matter which way ...

Photoshop CS6 tutorial showing how to make a colorful nebula and celestial sphere in deep space. PSD file: <a href=" Planet ...

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Big science has always needed big patronage, from rulers, rich aristocrats or state organizations. A striking example is the huge armillary sphere by the sixteenth-century astronomer Antonio Santucci.