The fact that you can see the moon simultaneously from different parts of the world plays into the flat earth theory. People get frustrated at this, but it is understandable when people say you can see the moon from different parts of the world at the same time. However, a little geometry can explain how it is possible. The further away an object is away from you, the more people will be able to see it if the object is big enough.
The same goes with the moon; the diagram below illustrates if the moon was closer. If the moon were a little further away, more of us on earth from different areas would see it simultaneously. Then the last section on the diagram how the moon is and both sides of our earth can see the moon at the same time.
An excellent video below goes into more detail and explains how all this works with an excellent demonstration.
Okay, so if we are in the United States of America, we now know that it is possible to see the moon simultaneously as someone in Ireland. But how many hours a day is the moon visible. Knowing how many hours the moon is visible makes planning a moongazing session much better. The moon is above the horizon 12 hours per 24 hours a day because of the earth and moon rotation. The 12 hours never coincide fully with nightfall; the window for observing the moon is around 6 hours per night.
Very rarely, if the conditions are just right, you may also be able to see an actual Full Moon very close to the horizon and opposite to the Sun, during sunrise or sunset. In general, however, the Moon is always below the horizon while the Sun is up on the date of the Full Moon.
Moonrise and Moonset in my city. The answer lies in the method astronomers use to determine the moment of each Moon phase. The phases of the Moon are not defined by the Moon's visibility from a particular location on Earth, but by the Moon's position on its orbit around Earth. When I say 'near' I mean near from our vantage point looking up at the sky. Imagine that your head is the entire Earth. You are also holding a mirror in your hand, with your arm outstretched.
You can imagine that, right? Now switch on a bedside light a few metres away and turn away from the light. With your mirror stretched out in front of you, angle it so that you see the light reflected in it, can you?
You just need to make sure that your head is not exactly between the light and the mirror that is called an eclipse. If your head is not exactly in the way, then you can find a way to see the light behind you, reflected in the mirror. This is the situation where the Sun — the light — is behind you so that it is day for the people living on the back of your head, and the Moon, the mirror, reflects the light of the Sun so that you, on the front of your head, can see the Moon.
The back of your head is in daylight, and the dwellers there see the Sun high in their sky, while you, at the front of your head see the Moon in the night sky. I should add: this is full moon for you. Lunar calendar: The phase of the Moon is the shape of the directly sunlit portion of the Moon as viewed from Earth.
But you asked me why we see the Moon in the day time! I know! So now, turn around so that the light bulb is not directly in front of you, but kind of a little to your left, in such a position that you can see it better with your left eye than your right eye. However, you can argue that your face is still in daylight because you can see the light bulb. You are still holding the mirror in front of you, yes?
Now angle the mirror so that you can see the light bulb reflected in it. You are going to have to angle that mirror quite a bit, but you can do it.
0コメント