So, when the sun caused an animal to cast a shadow on the ground, it was a premonition of six more weeks of winter, as opposed to an early spring. Germans initially used a hedgehog to predict when ...

The axial tilt's most dramatic effect comes during the solstices ... at the exact time of an equinox, your shadow would be at its absolute minimum. The sun would also appear almost directly ...

This effect ... the Sun-Moon-Earth all line up. Using a spacecraft, means that in principle you can orbit the Earth-Moon barycentre at the necessary distance and then pass through the shadow ...