Let’s put a marker on Scotland. When this part of the Earth is facing the Sun it’s day time, when it’s facing away from the Sun that's night time. One spin of the Earth is how we measure one ...

How far away is Mars? To determine how long it ... other would be when Mars is at its closest point to the sun (perihelion) and Earth is at its farthest (aphelion). This would put the planets ...

Earth zooms through its orbit at an average velocity of 18.5 miles a second. During this circuit, our planet is an average of 93 million miles away from the sun, a distance that takes light about ...

but got carried away and wound up animating its entire history. The sequence starts with the moon's current position and follows it back in time to its birth, tracking its distance from Earth ...