Sundials typically have a vertical gnomon and hour markers positioned in a circular pattern. As the earth rotates around the sun, the gnomon’s shadow moves showing the time of day. Analemmatic ...

So why do shadows matter? Well, before clocks were invented, the ancient Egyptians used sundials to tell the time with shadows – three and a half thousand years ago! We may have technology to ...

The inventions of the hemispherium and the hemicyclium are attributed to Berosus (356-323 BCE), a Chaldean priest and astronomer who brought these types of sundials to Greece ... sun moved across the ...

The recent change to daylight saving time is a reminder to invest time wisely and, perhaps, find time to enjoy an educational ...

The sundial works by casting the shadow of the gnomon (a reflection of the celestial north-south meridian) on the two quadrants (a reflection of the equatorial plane) hour by hour, minute by minute.