A clear explanation of how Earth’s orbit shaped the Gregorian calendar and why leap years keep our calendar aligned with the seasons.

Credit: Space.com | footage & animations: NASA/SDO & AIA/EVE/HMI science team / SOHO (ESA & NASA) / GSFC / SWPC | edited by ...

Finlay Campbell says the skies above Inverclyde can hold as much inspiration for today's young people as what's on the ground.

This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of ...