moving in the same direction as it spins around its axis, it has to rotate a little further each day to catch up with the Sun. This makes a solar day a little longer than a sidereal day—just under 4 minutes
Intuitively, a curve may be thought of as the trace left by a moving point. Turn To cause to move around an axis or center; cause to rotate or revolve A motor turns the wheels. Curve A line that deviates from straightness in a smooth, continuous fashion. Turn To cause to move around...
What Makes the Hunter’s Moon Special? The Harvest Moon does typically occur in September, taking the place of thefull Corn Moon. However, it occasionally lands in October instead, replacing thefull Hunter’s Moon. Why Is it Called the Harvest Moon? For several evenings, the moonrise comes ...
Van Maanen Star is the closest stand-alone white dwarf to us: it is 14 light-years away from the Sun. They have just received a signal from Earth that Barack Obama had become the 44th president of the United States. It is difficult to say how the local residents would react to this ...
Why Earth rotate around its own axis? What is the vernal equinox, and what does it have to do with the celestial prime meridian? If the Moon sets just after the Sun, what phase is it in? A 160 W street lamp is operated for 12 hours a day. How much energy does it take...
Antimatter, the Real Philosopher's Stone Quantum field theory holds that particles and antiparticles are equal but opposite fluctuations in the same underlying matter field. This is where the idea of antimatter comes from. According to the Standard Model, for each type of particle that makes up ...
Consequently, during the Devonian period (400 million years ago), the earth rotated about 40 more times during one revolution around the sun than it does now. Because the continents have drifted significantly since that time, it is difficult to make estimates of the land versus ocean outlines ...
What makes a ball roll down a hill?Question:What makes a ball roll down a hill?Free Body DiagramTo determine the state of motion (where rest is a state of motion as well) of a physical object, it is often advantageous to establish a Free-Body-Diagram (FBD) of the object showing all...
Typically, the properties of an object's motion change depending on how it is rotated. Consider a cylinder, half of which is made of lead and the other half of which is hollow. If an axis of rotation were chosen through its long axis, the distribution of mass around this axis ...
The key observation that makes the above equivalences work is that this relation is continuous in the sense that if is an open subset of , then the inverse image is also open. Indeed, if for some , then contains a finite set such that , and then any that contains both and lies in ...