On a hill above Washington, D. C. , a team of scientists watches the sky. They belong to the U. S. Naval Observatory, or USNO for short. Their job is simple: keep track of the stars and the exact moment in time. Since 1873 a telescope at USNO has watched bright stars every night. The data
Earth's spin is not constant. It changes slightly every day. This summer, it will speed up on three days. The changes are so small that people won't notice them. The days will be shorter by a fraction of a second. The moon's position affects Earth's spin. When the moon is far from Earth's equator,
Ever wondered why we use different dates to mark important events? It's not just about the day or the month, but also the year. Let's dive into the fascinating world of dates and why they change. First, let's talk about why dates change at all. It's all about the calendar we use. You see, there are
