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Look westward at nightfall to see the Pleiades star cluster above tonight’s smiling lunar crescent. As seen from middle and far northern latitudes, the moon and Pleiades stay out well past dark tonight. For an extra treat, note the soft glow of earthshine on the moon’s dark (nighttime) side with the unaided eye or binoculars.
When can you see earthshine on a crescent moon?
Sometimes when there is a crescent moon shortly after sunset, you can see not only the bright crescent of the moon, but also the rest of the moon as a dark disc. Why can you see the dark disc of the moon? Shouldn’t it be pitch dark like space?
That pale glow on the unlit part of a crescent moon is light reflected from Earth. It’s called “earthshine.” Bright moonlight can illuminate an earthly landscape on nights when the moon is full. Likewise, whenever we see a crescent moon, a nearly full Earth appears in the moon’s night sky – and illuminates the lunar landscape. Next time you see a waxing crescent moon after sunset, think about the fact that the sun is just below your western horizon.
And when you’ve got that sense of the moon and sun in space, expand your thinking – to include the Earth under your feet. You might get a sense of the sun, shining on Earth’s day side – and see the glow on the unlit portion of the moon for what it really is – sunlight reflected from Earth.
Originally posted by bauldrick
reply to post by LeoVirgo
could we have your rough location as am sure that we have never seen the moon like this in the northern hemisphere well in good old blighty we have'nt well not that I can ever remember in the last 38 yrs
Originally posted by bauldrick
reply to post by LeoVirgo
could we have your rough location as am sure that we have never seen the moon like this in the northern hemisphere well in good old blighty we have'nt well not that I can ever remember in the last 38 yrs
Originally posted by Trublbrwing
Originally posted by bauldrick
reply to post by LeoVirgo
could we have your rough location as am sure that we have never seen the moon like this in the northern hemisphere well in good old blighty we have'nt well not that I can ever remember in the last 38 yrs
I am in the northern hemisphere as well and the first time I saw the moon lit from the bottom (smiling) was May of 2010. It has become a common occurance since then. If and when you see it you will be assaulted with propaganda telling you it is normal and that you have just never noticed before. A web search will reveal many pictures of this phenomenon, some are obvious fakes and others are simply rotated photos of ordinary crescent moons. Do some research and you will find many videos on you tube and several posts on ATS discussing this issue.
The first thing to notice about tonight's moon (Feb. 9) is its orientation. For observers in the northern hemisphere, the terminator is almost horizontal, rather than the vertical orientation shown in most books.
Despite recent videos on YouTube, there is nothing unusual about this. It is caused by the angle which the moon’s orbit makes with the horizon at this time of year, so that the moon appears to be lit from below. Think for a moment about where the sun is located, and you’ll realize that the moon’s orientation makes complete sense.
Originally posted by bauldrick
reply to post by LeoVirgo
many thanks well interesting have often spent an hour or two looking at the night sky and have never seen it highlighted from the bottom looks well cool always been led to believe you could only see this from the southern hemisphere will be keeping a look out and once again thankyou
Originally posted by Trublbrwing
Originally posted by bauldrick
reply to post by LeoVirgo
many thanks well interesting have often spent an hour or two looking at the night sky and have never seen it highlighted from the bottom looks well cool always been led to believe you could only see this from the southern hemisphere will be keeping a look out and once again thankyou
Actually you should only see it near the equator. When the crescent is lit on the left in the northern hemisphere it is lit on the right in the southern hemisphere. I would caution you to trust your instincts and intuition on this matter, google upturned crescent and moon lit from the bottom for more information and make your decision based on ALL the evidence.
Originally posted by LeoVirgo
Here is a astronomical image of the position of the Sun and Moon as they are in the western sky tonight. The moon is still very close with the Sun so it may be hard to see the crescent moon tonight but keep looking over the next several nights!!
What we can see here is that the Sun and Moon are setting on a similar vertical path to the horizon. When the Sun sets, it will shine the bottom side of the moon.
More often then not...the Sun takes a path that sits just to the side of the moon (or better yet, the moon takes a path that sits to one side or the other of the Sun, because the Sun does not stray as much from its path like the moon does). So most of the time when people are seeing the 'side' of the moon making the crescent shape, the Moon is sitting more to the left of the Sun while the Sun is shining onto its right side. The seasons and earths tilt also play a part in this a bit too.
I'm puzzled. When exactly did you make the quantum leap of knowledge from casual observer to astonomer? Now you have diagrams and a better than average insight into the workings of the galaxy?
Originally posted by Trublbrwing
reply to post by LeoVirgo
I am most certainly NOT confusing instinct with familiarity, I have lived through over 500 moon cycles. I have observed them while camping with the cub scouts and while lying on my back in a sailboat. There is a well used telescope in the next room and there are four pairs of high quality binoculars in the house as well as one pair in each of my automobiles. The very first thing I do every morning when I leave the house is look at the sky, I repeat the ritual every single time I exit a building.
On the book case to my left are sixteen books on astonomy, among them are field guides and detailed maps of the night sky in my area. I am intimately familiar with the night sky and have no doubt about my ability to judge what is normal and what is unusual.
THE CRESCENT ON THE BOTTOM OF THE MOON IS UNUSUAL, IT IS AN ANOMOLY.