Tag:
Astronomy
As a general rule, we live our secular life by a so-called solar calendar, the Gregorian calendar, which determines our calculation of time since the end of the 16th century. The biggest advantage of a solar calendar is its connection to the seasons: it is warm in summer, cold in winter, at least this is how it should be … at times however, as we all know, the weather goes crazy and sunshine is long-awaited in summer and snow stays away in winter. The seasons are connected to the (solar) calendar months.
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On Wednesday, 15th June 2011 (or Thursday 16th June for certain time zones) is full moon and a total lunar eclipse at the same time. However, it will only be completely visible in the Near and Middle East. In Asia and Australia, the moon will be already set and in Europe and Africa, the moon will be just rising by the time the lunar eclipse takes place. In America, this event won’t be visible at all.
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Worth seeing | 15 Comments
The Moon has not always been there. And although, no one has been present to observe its creation, scientists today, largely share the view that our Moon originates from a collision between Earth and another planet 4.5 billion years ago.
Our Earth – that looked completely different to how we know it to be today – had been circling with the planet Theia, which was about the size of our Mars, around the Sun. Some day, these two orbs clashed, produced an inconceivably powerful collision that totally destroyed Theia and catapulted an enormous amount of rocks into the orbit of Earth.
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Quite a lot! The date of Easter is actually determined by the full moon. Quite contrary to Christmas, the Easter date is part of the changing holidays and defined as follows: “Easter is on the Sunday after the first full moon in spring.”
At first glance, this appears to be quite easy: one look at the calendar, beginning of spring is mostly on 21st March and then simply search for the next full moon and the weekend after will be Easter.
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As is generally known, the Moon is not a disc but a sphere and one could ask the question if we actually get to see different sides of this Moon sphere? The answer is: no! At least this is true for the observer from Earth.
Indeed, we always see one half of the Moon. This is because the Moon is locked into the Earth rotation. This is called »synchronous rotation«. It means that we are never able to see the side of the Moon facing away from us. And until it was possible to photograph the reverse of the Moon with space probes, nobody knew what we would find or how it would look.
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Maybe it lies within the plan of creation that we are so susceptible to everything that is bigger than what we already know or have already experienced. However, the following merely relates to heavenly bodies …
As we recently wrote in our article »Sun and moon the same size?« here in our full moon blog, the moon changes its distance to earth due to its unusual orbit and subsequently appears to be of a different size for the observer here on earth, depending on how close it is to earth at the time. Is the moon (or another heavenly body) as close to earth as possible, one speaks of perigee, and if it is the furthest away, it is called apogee. You can confidently forget these terms again, however, you may want to memorise that the moon can appear to us in different sizes.
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Everyone knows that the sun is much larger than the moon and much further away from earth. In this very context lies a fascinating fact: both celestial bodies appear to be of similar size on the firmament, when observed from earth. Which implies that the sun has to be as many times bigger than the moon, as it is further away from the earth than the moon from the earth …
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Have you ever seen a face or shape of an animal in passing by clouds? This tendency of our perception to find structures within an image or a pattern, is called pareidolia (derives from Greek eidolon = picture). Essentially, this is a misperception where we see objects changing subjectively. But this can also be so much fun and inspire our fantasy to search for these shapes and to find them. Children, in particular, are known to be true masters of this game.
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No, this is not about another sequel of the science fiction movie or whether Arnold Schwarzengger is planning a trip to the moon … It is more about an astronomical term, where »terminator« describes the day-night border of a celestial body. This is the visible border between the illuminated side and the dark side of the object, being the border between day and night on the celestial body. The word »terminator« derives from Latin »terminare« = conclude, restrict.
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