why does the moon rise in different places
There are two reasons. First of all, it depends what time of day you are looking at the moon. For example, if you go outside tonight at 7:00 and tomorrow at 11:00, you would see the moon in two very different places in the sky. Not only that, but all the stars would be in different places in the sky as well! This is because the earth is spinning. It takes 24 hours for the the earth to spin once around, which means that from our point of view (sitting on the earth's surface) it looks like the sky and everything in it is moving around
us once per 24 hours. (This is the same reason that the sun rises and sets every day, giving us daytime and nighttime. ) But what would happen if you went outside on the second night at the exact same time you went out on the first night (7:00)? The stars will be in almost the same part of the sky as they were the first night. (Since you waited 24 hours, they had time to "move" around the earth once and get back to where they were before. ) But the moon will be in a different place! In fact, you would have to wait a little while (usually an extra 30 minutes or an hour) until it got back to the same place as it was the night before.
So what happened? How come the moon "fell behind" everything else? The answer is that the moon is moving. All the stars in the sky are pretty much standing still - they only look like they're moving because the earth is spinning, as I said above. But the moon is actually moving in orbit around the earth - it takes about a month for it to complete one circle around us. So the moon's motion has two parts to it. It looks like it's moving around the earth once per day along with everything else, but in addition to that it is actually moving around the earth once per month. That is what makes it move to a different place on the sky. It is even possible to watch the moon move, if you are patient enough. If you carefully keep track of the moon and a nearby star for an hour or so, you should be able to see the distance between them change! This page was last updated on July 18, 2015. I have been enjoying the moon rise for 4 or 5 evenings recently. Our house is situated with mountains to the east so it is very easy to "mark" the spot on the horizon where the moon comes up each evening. QUESTION: Why is there such a great variation in the place on the horizontal plane where the moon rises from one evening to the next?
There has been as much as 25 degrees or more difference in the spot that the moon clears the horizon from one evening to the next. The position of Moonrise and Moonset, like that of Sunrise and Sunset varies as the Earth goes around the Sun, but also with the phases of the Moon. Let's start with the position of Sunrise/Sunset, which varies as the Earth orbits the Sun. Because the Earth is inclined at an angle of 23. 5 degrees to the plane of its orbit, and because the direction of the inclination (with respect to the stars) does not change as the Earth moves around the Sun, sometimes the Earth is tilted towards the Sun and sometimes it is tilted away from it. This cause the Sun to take different paths across the sky across the year and gives us seasons. In the Northern hemisphere the pattern of the position of Sunrise/Sunset is as follows (in the Southern hemisphere exchange North for South and vice versa): Only on the equinoxes (Sept/Mar 21st) does the Sunrise/set at due East/West. At the solstices (Dec/June 21st) the position is its furthest South/North of East/West.
How far to the North or South that is depends on your lattitude. There are other posted answers on this, and. Now lets get to the Moon. The time of day that the Moon rises or sets depends on its phase. This should be obvious when you remember that the phase of the Moon depends on the relative positions of the Sun, Moon and Earth. For example when the Moon is Full it is opposite the Earth from the Sun, so when the Sun sets, the Moon must rise and vice versa. Here is a table summarizing that: By local noon and local midnight I mean the points when the Sun crosses the meridian, and exactly 12 hours later. This can be different from the time on your watch because we define time zones which all use the local time at the centre of the zone. So when the Moon is new, it rises and sets with the Sun, and the position of Moonrise/set varies just like that of Sunrise/set. When the Moon is full however the pattern is inverted. To be more explicit (again here this is for the Northern hemisphere, for the South exchange North for South): Like the Sunrise/set positions, the amount of variation depends on your lattitude. This page was last updated on July 18, 2015.
- Views: 0
why does the appearance of the moon change
why does the moon stay close to the earth
why does the earth spin on its axis
why does the moon seem to change size
why does the moon have different colors